Alphabetical Listing for R

• Rager H, Weiser G (1981) Polarized absorption spectra of trivalent chromium in forsterite, Mg2SiO4. Bull Minéral 104:603-609
• Rager H, Hosoya S, Weiser G (1988) Electron paramagnetic resonance and polarized optical absorption spectra of Ni2+ in synthetic forsterite. Phys Chem Mineral 15:383-389
• Rager H, Taran M, Khomenko V (1991) Polarized optical absorption spectra of synthetic chromium doped Mg2SiO4 (Forsterite). Physics and Chemistry of Minerals 18, 37–39.
• Rager H, Amthauer G, Bernroider M, Schürmann K (1996) Colour, crystal chemistry and mineral association of a green sphalerite from Steinperf, Dill syncline, FRG. European Journal of Mineralogy 8:1191-1198
• Rager H, Hosoya S, Weiser G (1988) Electron paramagnetic resonance and polarized optical absorption spectra of Ni2+ in synthetic forsterite. Physics and Chemistry of Minerals 15, 383-389.
• Raju AR, Reddy KM, Reddy BJ (1983) Optical and EPR measurements on triphylite. Proceedings of the Indian National Science Academy, Part A:Physical Sciences 49, 662-8.
• Raju, KS (1977) Radiation effects in calcite. Pramana 8:266-275
• Raman CV, Jayraman, A. (1954) The structure of amethyst quartz and the origin of its pleochroism: Proceedings of the Indian Academy ofScience 40, 189-195.
• Ramanaiah MV, Ravikumar RVSSN, Srinivasulu G, Reddy BJ, Rao PS (1996) Detailed spectroscopic studies on cornetite from southern Shaba Zaire. Ferroelectrics 175, 175-182.
  
• Ramanaiah MV, Ravikumar RVSSN, Chandrasekhar AV, Reddy BJ, Reddy YP, Rao PS (1998) Tetrahedral site of Cu(II) in bornite and bournonite. Ferroelectrics 216, 27-34. 
  
• Ravikumar RVSSN, Chandrasekhar AV, Reddy BJ, Reddy YP, Rao PS (1997) Electronic spectra of cobaltite. In Modern Applications of EPR/ESR from Biophysics to Materials Science, ed. Rudowiz CZ. Springer (Singapore) 1, 523-527.
• Ravikumar RVSSN, N.Madhu N, Chandrasekhar AV, Reddy BJ, Rao PS, Reddy YP (1998) Cu2+, Mn2+ in tetragonal site in chrysocolla. Radiation Effects and Defects in Solids 143:263-272
• Ravikumar RVSSN, Madhu N, Chandrasekhar AV, Reddy Bj, Rao PS, Reddy YP (2004) Spectral investigations of iron bearing fluoroapatite. Radiation Effects & Defects in Solids 159, 87-91.
• Ravikumar RVSSN, Chandrasekhar AV,Yamauchi J, Reddy UP, Rao PS (2005)Tetrahedral site of iron in natural mineral sodalite. Radiation Effects & Defects in Solids 160, 109–115.
• Rayleigh L (1923) Studies of iridescent color and the structure producing it. III. The colors of Labrador feldspar. Proceedings of the Royal Society of London, Series A: Mathematical, Physical and Engineering Sciences (1923), 103, 34-45.
• Recker K, Neuhaus A, Leckebusch R (1968) Vergleichende Untersuchungen der Garb- und Lumineszenzeigenschaften natürlicher und gezüchteter definiert dotierter Fluorite. Proc Internat Mineral Assoc, Cambridge, 145-152

• Reddy BJ, Lakshman SVJ (1975) Optical absorption spectra of Ni2+ in garnierite: a reply. Canad Mineral 13:300-301
• Reddy BJ, Jacob AS, Janardhanam K (1980) Spectroscopic studies of transition metal ions in spessartine garnet. Pramana 14, 137-41.
• Reddy BJ, Sarma KBN (1980) Optical absorption spectrum of iron(3+) in orthoclase feldspar. Proceedings of the Indian National Science Academy, Part A:  Physical Sciences 46, 176-180.
• Reddy BJ, Sarma, KBN (1981) Absorption spectra of copper(2+) in azurite. Solid State Communications 38, 547-9.
• Reddy BJ, Sarma KBN (1981) Optical properties of chromate centers in crocoite. Physics Letters A, 86A, 386-8.
  
• Reddy BJ, Moorthy LR (1982) Optical absorption spectrum of chromium(3+) in natural ruby. Pramana 19, 449-54.
• Reddy BJ, Sarma KBN (1982) Absorption spectra of manganese(2+) in manganoan clinozoisite. Acta Physica Academiae Scientiarum Hungaricae 52, 117-122.
• Reddy BJ, Sarma KBN (1982) Electronic absorption spectrum of chrysotile asbestos. Indian Journal of Physics, B 56B, 29-34.
  
• Reddy BJ, Yamauchi J, Reddy YP, Venkataramanaiah M, Ravikumar RVSSN, Chandrasekhar AV (2002) Optical and EPR Spectra of titanium (III) in lamprophyllite from Kola Peninsula, Russia. Neues Jahrbuch Mineralogie Monatshefte 2002:138-144
• Reddy BJ, Frost RL (2004) Electronic and vibrational spectra of gaspeite. Neues Jahrbuch für Mineralogie-Monatschefte 2004, 525-536.
• Reddy BJ, Nieto F, Navas AS (2004) Spectroscopic characterisation of rosasite and aurichalcite. Neues Jahrbuch fur Mineralogie-Monatshefte 2004, 302-316.
  
• Reddy BJ, Yamauchi J, Ravikumar RVSSN, Chandrasekhar AV, Renkataramanaiah M (2004) Optical and EPR investigations on smithsonite minerals. Radiation Effects and Defects in Solids 159, 141-147.
• Reddy BJ, Frost RL (2005) Spectroscopic characterization of chromite from the Moa-Baracoa Ophiolitic Massif, Cuba. Spectrochimica Acta A - Molecular and Biomolecular Spectroscopy 61, 1721-1728.
• Reddy BJ, Frost RL, Martens WN (2005) Characterization of conichalcite by SEM, FTIR, Raman and electronic reflectance spectroscopy. Mineralogical Magazine 69, 155-167. 
  
• Reddy BJ, Frost RL, Palmer SJ (2008) A Near Infrared spectroscopic study of the phosphate mineral pyromorphite Pb5(PO4)3Cl. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 71, 430-435. 
  
• Reddy BJ, Frost RL, Dickfos MJ (2009) Characterisation of Ni silicate-bearing minerals by UV–vis–NIR spectroscopy. Effect of Ni substitution in hydrous Ni–Mg silicates. Spectrochimica Acta Part A 71, 1762–1768.
  

• Reddy GU, Reddy RR, Reddy SL, Frost RL, Endo T (2011) Spectroscopic and structural characterization of pascoite. Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy 79, 1402-1405.
  
• Reddy GU, Seshamaheswaramma K, Nakamura Y, Reddy SL, Frost RL, Endo T (2012) Electron paramagnetic resonance, optical absorption and Raman spectral studies on a pyrite/chalcopyrite mineral. .Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 96, 310-315.
  
• Reddy KM, Moorthy LR, Reddy BJ (1985) Absorption spectrum of chromium(3+) in stichtite mineral. Indian Journal of Physics, A 59A, 379-82.
  
• Reddy KM, Jacob AS, Reddy BJ (1986) Electronic and vibrational absorption spectra in otwayite, a new nickel mineral. Physics Letters A 115, 182-185.
  
• Reddy KM, Jacob AS, Reddy BJ (1986) EPR and optical spectra of copper(2+) in dioptase. Ferroelectrics, Letters Section 6, 103-112.
  
• Reddy KM, Moorthy LR, Reddy BJ (1987) Electronic and vibrational absorption-spectra in falcondoite. Solid State Communications 64, 1085-1088.
• Reddy KM, Jacob AS, Reddy BJ, Reddy YP (1987) Optical-absorption spectra of Cu2+ in brochantite. Physica Status Solidi B: Basic Research 139:145-150
• Reddy KM, Jacob AS, Reddy BJ (1986) Electron-paramagnetic-resonance and optical-spectra of Cu2+ in dioptase. Ferroelec Lett 6:103-112
• Reddy L, Jacob AS, Reddy BJ (1987) Optical absorption spectrum of Ti3+ and Fe2+ in uvite. Indian Gemmologist 1987, 19-21.
• Reddy NCG, Fayazyddin SM, Reddy RRS, Reddy GS, Reddy SL, Rao PS, Reddy BJ (2005) Characterisation of prehnite by EPMA, Mössbauer, optical absorption and EPR spectroscopic methods. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 62, 71-75.
  
• Reddy RR, Reddy SL, Reddy GS, Reddy BJ (2000) Optical absorption and EPR spectra of magnesite mineral. Radiation Effects and Defects in Solids 153, 53-58.
  
• Reddy RRS, Lakshmi RS, Siva RG, Reddy BJ (2002) Spectral studies of divalent copper in antlerite mineral. EPR in the 21st Century: Basics and Applications to Material, Life and Earth Sciences, Proceedings of the Asia Pacific EPR/ESR Symposium, 3rd, Kobe, Japan, Oct. 29-Nov. 1, 2001 (2002), 589-594.
• Reddy RRS, Reddy SL, Reddy GS, Reddy BJ (2002) Crystal Research and Technology 37, 485-490.  
  
• Reddy RRS, Fayazuddin M, Reddy GS, Reddy Sl, Rao PS, Reddy BJ, Garcia Fn (2004) Tetrahedral site of Fe(III) and Cu(II) in renierite. Crystal Reseach and Technology 39, 240-244.
  
• Reddy RRS, Reddy SL, Rao PS, Frost RL (2010) Optical absorption and EPR studies on tenorite mineral. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 75, 28-31.
  

• Reddy SL, Reddy KM, Ramesh K, Reddy BJ (1988) Spectral studies of manganese(2+) in friedelite. Solid State Communications 66, 1169-1171.
• Reddy SL, Rao PS, Reddy BJ (1991) Mössbauer, optical absorption and EPR spectra of Fe3+ in plumbo-jarosite minerals. Physics Letters A 161, 74-76.
• Reddy SL, Rao PS, Reddy BH (1993) Optical absorption and EPR spectra of VO(II) in wavelite. Spectrochimica Acta A 49A, 1-18.
  
• Reddy SL, Reddy BJ, Rao PS (1993) Optical absorption and EPR spectra of oxovanadium(2+) in wavellite. Spectrochimica Acta, Part A:  Molecular and Biomolecular Spectroscopy (1993), 49A(4), 599.
  
• Reddy SL, Brddy BJ (1996) Optical Absorption and EPR Studies on Varisite. Radiation Effects and Defects in Solids 138, 139-143.
• Reddy SL, Subba REddy RR, Reddy GS, Rao PS, REddy BJ (2003) Optical absorption and EPR spectra of fuchsite. Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy 59, 2603-2609
  
• Reddy SL, Reddy GS, Wain DL, Martens WN, Reddy BJ, Frost RL (2006) Electron paramagnetic resonance, optical absorption and IR spectroscopic studies of the sulphate mineral apjohnite.Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 65, 1227-1233
  
• Reddy SL, Reddy NCG, Reddy GS, Reddy BJ, Frost RL (2006) Characterization of clinohumite by selected spectroscopic methods. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 65, 684-688. 
  
• Reddy SL, Fayazuddiin M, Reddy NCG, Endo T, Frost RL (2008) Electron paramagnetic resonance and optical absorption spectral studies on tetrahedrite and tennantite minerals.Radiation Effects and Defects in Solids 163, 19-27.  
  
• Reddy SL, Frost RL, Sowhanya G, Reddy NCG, Reddy GS, Reddy BJ (2008) EPR, UV-Visible, and Near-Infrared Spectroscopic Characterization of Dolomite. Advances in Condensed Matter Physics. 2008. Article ID 175862.
• Reddy SL, Reddy BJ, Frost RL (2009) Spectroscopic investigations of descloizite. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 72, 194-197.
  
• Reddy SL, Endo T (2010) The spectroscopy of copper-​oxide - minerals. Transactions of the Materials Research Society of Japan 35, 423-429.  
  
• Reddy SL, Maheswaramma KS, Reddy GS, Frost RL, Endo T (2010) Optical absorption, infrared, Raman, and EPR spectral studies on natural iowaite mineral. Transition Metal Chemistry (Dordrecht, Netherlands) 35, 331-336.
  
• Reddy SL, Maheswaramma KS, Reddy GS, Reddy BJ, Frost RL, Endo T (2010) EPR and optical absorption spectral studies on voglite mineral. Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy 77, 11-15.
  
• Reddy SL, Maheswaramma KS, Reddy RR, Reddy AV, Nakamura y, Reddy BJ, Endo T, Frost RL (2011) Electron paramagnetic resonance, NIR studies on zoisite, clinozoisite and chrom-zoisite minerals. Spectrochimica Acta A 78, 1240-1244.
  

• Reddy SN, Ravikumar RVSSN, Reddy BJ, Rao PS (1995) Optical and EPR spectra of libethenite mineral. Ferroelectrics 166:55-62
• Reddy SN, Ravikumar RVSSN, Reddy BJ, Reddy YP (2000) Chemical and electronic spectral studies of ullmannite. Indian Journal of Engineering & Materials Science 7:459-460
• Reddy SN, Rao PS, Ravikumar RVSSN, Reddy BJ, Reddy YP (2001) Spectral investigations on melanterite mineral from France. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 57, 1283-1287   
• Reddy SN, Ravikumar RVSSN, Reddy BJ, Reddy YP, Rao PS (2001) Spectroscopic investigations of Fe3+, Fe2+ and Mn2+ bearing antigorite mineral. Neues Jahrbuch Mineralogie Monatshefte 2001:261-270
• Reddy SN, Rao PS, Ravikumar RVSSN, Reddy BJ (2001) EPMA, optical, EPR and IR spectral studies of prehnite mineral. Indian Journal of Physics 75A:429-432
• Reed JS (1971) Optical absorption spectra of Cr3+ in MgO·Al2O3 - MgO·3.5Al2O3 spinels. Journal of The American Ceramic Society 54, 202-204.
• Reed JS. Lau HF (1969) Optical Spectra of 3d Transition Metal Ions in MgO·Al2O3 - MgO·3.5Al2O3 Spinel. Journal of The American Ceramic Society 52, 307-311.
  
• Reed JS, Kay HF (2006) Optical Spectra of 3d Transition Metal Ioins in MgO3.5-Al2O3 Spinel.  Jokurnal of the American Spcoetu 52. 307-311.
  
• Rehman HU, Martens G, Tsai YL, Chankhantha C, Kidkhunthod P, Shen AH (2020) An X-ray Absorption Near-Edge Structure (XANES) Study on the Oxidation State of Chromophores in Natural Kunzite Samples from Nuristan, Afghanistan. Minerals 10, 463. 11 pages
• Reinen D, Lachwa H, Allmann R (1986) Farbe und Konstitution bei Mnv in tetraedrischer Sauerstoffkoordination. I. EPR- und ligandenfeldspektroskopische Untersuchungen an MnV-haltigen Apatiten sowie die Struktur von Ba5(MnO4)3Cl. Zeitschrift für anorganische und allgemeine Chemie 542, 71–88.
• Reinen D, Albrecht C, Kaschuba U (1990) Farbe und Konstitution bei Chrom(V) in tetraedrischer Sauerstoffkoordination. I. EPR- und ligandenfeldspektroskopische Untersuchungen an Chrom(V)-haltigen Apatiten und Spodiositen. Zeitschrift für anorganische und allgemeine Chemie 584, 71-86 (in German).
• Reinitz IM, Rossman GR (1988) Role of natural radiation in tourmaline coloration. American Mineralogist  73:822-825
• Reinitz IM, Fritsch E, Shigley JE (1998) An oscillating visible light optical center in some natural green to yellow diamonds. Diamond Related Materials 7:313-316
• Renfro N (2011) Vanadium-bearing color-change sphene from Pakistan/Afghanistan. Gems & Gemology 47, 327-328.
• Reznitskii L, Clark CM, Hawthorne FC, Grice JD, Skogby H, Halenius U, Bosi F (2014) Chromo-alumino-povondraite, NaCr3(Al4Mg2)(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup. American Mineralogist 99, 1767-1773.
• Richardson SM (1973) A pink muscovite with reverse pleochroism from Archer's Post, Kenya. American Mineralogist  60:73-78
• Richardson SM (1976) Ion distribution in pink muscovite: A reply. American Mineralogist  61:1051-1052
• Rink WJ, Gielisse PJ, Plendl HS (1990) Coloration in electron-irradiated beryl. J Gemm 22:33-37
• Richman I, Kisliuk P, Wong EY (1967) Absorption spectrum of U4+ in zircon (ZrSiO4). Phys Rev 155:262-267
• Ripinen OI, Solntsev VP, Lokhova GG, Bukin GV, Veis NS (1978) Effect of iron and chromium ions on the color of beryls.Trudy Zapadno-Sibirskogo Otdeleniya, Vsesoyuznoe Mineralogicheskoe Obshchestvo 7. 145-54.(in Russina) .
• Ristic S, Eichoff HJ (1955) Les spectres d’absorption et réflexion de quelques variétés de béryls synthêtiques et naturels [Absorption and reflection spectra of some synthetic and natural varieties of beryl]. Congrés Groupement l’Avancement des Méthods d’Analyse Spectrographiques des Produits Métallurgiques 18, 385-411.
• Robbins DW, Strens RGJ (1968) Polarization-dependence and oscillator streingths of metal-metal charge-transfer bands in iron (II,III) silicate minerals. Chemical Communications (London), 1968, 508-509.
• Robbins DW and Strens (1972) Charge-transfer in ferromagnesian silicates: The polarized electronic spectra of trioctahedral micas. Mineralogical Magazine 38, 551-563.
• Rondeau B, Chamard-Bois S, Fritsch E, Notari F (2018) Unique, reverse dichromatism in andalusite related to total pleochroism of the Fe2+-Ti4+ IVCT. Geophysical Research Abstracts 20, EGU2018-8807.
• Rondeau B, Chamard-Bois S, Fritsch E, Notari F, Chauviré B (2018) Reverse dichromatism in gem andalusite related to total pleochroism of the Fe2+-Ti4+ IVCT. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 204, 611–619.
• Ross CR, Keppler H, Canil D, O’Neill HStC (1996) Structure and crystal-field spectra of Co3Al2(SiO4)3 and (Mg,Ni)3Al2(SiO4)3 garnet. American Mineralogist 81, 61–66.
• Ross NL, Sowerby JR (1999) High-pressure crystal-field spectra of single-crystal clinoferrosilite. European Journal of Mineralogy 11, 791-801.
  

• Rossman GR (1974) Optical spectroscopy of green vanadium apophyllite from Poona, India. American Mineralogist  59:621-622
• Rossman GR (1974) Lavender jade. The optical spectrum of Fe3+ and Fe2+-Fe3+ intervalence charge transfer in jadeite from Burma. American Mineralogist  59, 868-870
• Rossman GR (1975) Spectroscopic and magnetic studies of ferric iron hydroxy sulfates: Intensification of color in ferric iron clusters bridged by a single hydroxide ion. American Mineralogist  60, 698-704
• Rossman GR (1976) Spectroscopic and magnetic studies of ferric iron hydroxy sulfates: The series Fe(OH)SO4·nH2O and jarosite. American Mineralogist  61, 398-404
• Rossman GR (1976) The optical spectroscopic comparison of the ferric iron tetrameric clusters in amarantite and leucophosphite. American Mineralogist  61, 933-938.
• Rossman GR (1980) Pyroxene spectroscopy. In: C.T. Prewet, ed., Pyroxenes. Rev. Mineral 7, 93-116
• Rossman GR, Shannon RD, Waring RK (1981) Origin of the yellow color of complex nickel oxides. J Solid State Chem 39, 277-287.
• Rossman GR, Grew ES, Dollase WA (1982) The colors of sillimanite. American Mineralogist 67, 749-761. 
  
• Rossman GR, Qui Y (1982) Radioactive irradiated spodumene. Gems and Gemology 10, 87-90.
• Rossman GR (1984) Spectroscopy of Micas. In: S.W. Bailey, ed., Micas. Reviews in Mineralogy 13, 145-181.
• Rossman GR (1988) Optical Spectroscopy. In: F.C. Hawthorne, ed., Spectroscopic Methods in Mineralogy and Geology. Reviews in Mineralogy 18, 207-254.
• Rossman GR, Fritsch E, Shigley JE (1991) Origin of color in cuprian elbaite from Sao Jos‚ de Batalha, Paraíba, Brazil. American Mineralogist 76, 1479-1484.
• Rossman GR (1994) Colored varieties of the silica minerals. In Haney PJ (ed). Review in mineralogy and geochemistry, Silica. 29, 433-467.
• Rossman GR (1996) Dumortierite and the colour of rose quartz. 3rd European Meeting on Spectroscopic Methods in Mineralogy, Kiev, Sept. 1996, Abstr., 33.
• Rossman GR (1996) Why hematite is red: Correlation of optical absorption intensities and magnetic moments of Fe3+ minerals. Mineral Spectroscopy: A tribute to Roger G. Burns. The Geochem Soc, Special Pub 5, eds: MD Dyar, C McCammon, MW Schaefer.
• Rossman GR, Taran MN (2001) Spectroscopic standards for four- and five-coordinated Fe2+ in oxygen-based minerals.  American Mineralogist 86:896-903
• Rossman GR (2006) The mineral spectroscopy server. http://minerals.gps.caltech.edu
• Rossman GR (2011) The Chinese red feldspar controversy: Chronology of research through July 2009. Gems & Gemology, Vol. 47, No. 1, pp. 16–30.
  
• Rossman GR, Laurs BM (2014) Orange lizardite from South Africa. The Journal of Gemmology 34, 98-99.
• Rossman GR, Laurs BM, Hoover D (2015) Purple garnets from East Africa. The Journal of Gemmology 34, 656-658.
• Rossman GR, Ma C, Laurs BM (2016) Yellow dravite from Tanzania. The Journal of Gemmology 35, 190-192.
  
• Rossman GR (2017) Coloration of green dravite from the Commander Mine, Tanzania. The Journal of Gemmology 35, 574-575.
  

• Rout PP, Sahoo RK, Singh SK, Mishra BK (2017) Spectroscopic investigation and colour change of natural topaz exposed to PbO and CrO3 vapour. Vibrational Spectroscopy 88, 1-8.
• Ruan S (2022) HPHT-Processed Natural Type 1a Diamond. Gems & Gemology 58, 48-49.
• Ruan Y, Dou Y, Li Y, Liu H (1996) Study on the color origin and decoloration of Shandong sapphire. Guisuanyan Xuebao, 24:203-208 (in Chinese)
• Rudenko SS, Sakharov AN (1989) Ob okraske zhelezosoderzhashchikh muskovitov. [The color of iron- bearing muscovite.] Voprosy Geokhimii i Tipomorfizm Mineralov 4, 150-162. (In Russian)
• Rumyantsev VN, Grum-Grzhimailo SV, Boksha ON (1971) Optical absorption spectra of hydrothermal corundum crystals containing impurities. Soviet Phys Crystallogr. 16:373-374 
  
• Rumyantsev VN, Grum-Grzhimailo SV, Boksha ON (1971) Optical absorption spectra of hydrothermal corundum crystals containing impurities. Kristallografiya  16 , 445-447 (in Russian)
• Rumyantseva EV (1985) O nekotorykh mineralakh khromo-vanadiyevykh slyuditov Karelii. Zapiski Vsesoiuznogo mineralogicheskogo obshchestva. 114, 55-62. (About some chromo- vanadio-minerals from Slyuditov, Karelia.) (In Russian)

• Runciman WA, Sengupta D, Marshall M (1973) The polarized spectra of iron in silicates. I. Enstatite. American Mineralogist 58:444-450
• Runciman WA, Sengupta D, Gourley JT (1973) The polarized spectra of iron in silicates: II. Olivine. American Mineralogist 58:451-456
• Runciman WA, Sengupta D, Gourley JT (1974) The polarized spectra of iron in silicates: II. Olivine: a reply. American Mineralogist 59:630-631
• Runciman WA, Sengupta D (1974) The spectrum of Fe2+ ions in silicate garnets. American Mineralogist 59:563-566
• Runciman WA, Marshall M (1975) The magnetic circular dichroism of pyrope-almandine garnets. American Mineralogist 60, 1122-1124.
• Runciman WA (1987) Comment on the spin-forbidden absorption spectrum of Fe2+ in orthopyroxene by Zhao, SB, Wang, HS, Zhou, KW and Xiao, TB. Phys Chem Minerals 14:482

• Rüscher CH, Schrader G (1996) Temperature dependence of small polaron absorption in biotites. Phys Chem Mineral 23:243-245.
  
• Rüscher CH (2012) Temperature-dependent absorption of biotite: small-polaron hopping and other fundamental electronic excitations. European Journal of MIneralogy 24, 817-822.