References to mostly single crystal spectra with some diffuse reflection data, and articles about the color in some minerals.

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Books

Optical Spectra of Afghanite, (Na,K)22Ca10[Si24Al24O96](SO4)6Cl6  

Optical Spectra of Akaganeite FeO(OH)

Optical Spectra of Alleghanyite, Mn5(SiO4)2(OH)2  

Optical Spectra of Alunite, KAl3(SO4)2(OH)6 

Optical Spectra of Annabergite, Mg2Al(AlSiO5)(OH)4

Optical Spectra of Anapaite, Ca2Fe(PO4)2·4H2O

Optical Spectra of Anatase, TiO2

Optical Spectra of Antigorite, Mg3(Si2O5)(OH)4

Optical Spectra of Antlerite, Cu3(SO4)(OH)4

Optical Spectra of Ardennite-(As), Mn4Al4(AlMg)(AsO4)(SiO4)2(Si3O10)(OH)6

Optical Spectra of Astrophyllite, K2NaFe7Ti2Si8O26(OH)4F

Optical Spectra of Aurichalcite, (Zn,Cu)5(CO3)2(OH)

Optical Spectra of Azurite, Cu3(CO3)2(OH)

Optical Spectra of Bazzite, Be3Sc2(Si6O18

Optical Spectra of "Bentonite"

Optical Spectra of Bernalite, Fe(OH)3·nH2O

Optical Spectra of Blödite, Na2Mg(SO4)2·4H2

Optical Spectra of Bornite, Cu5FeS

Optical Spectra of Botryogen, MgFe(SO4)2(OH)·7H2

Optical Spectra of Bournonite, PbCuSbS

Optical Spectra of Brackebuschite, Pb2Mn(VO4)2(OH) 

Optical Spectra of Brochantite, Cu4(SO4)(OH)

Optical Spectra of Brownmillerite, Ca2(Al,Fe)2O

Optical Spectra of Bustamite, CaMn(Si2O6

Optical Spectra of Butlerite, Fe(SO4)(OH)·2H2

Optical Spectra of Cancrinite, (Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2·2H2

Optical Spectra of Carnotite, K2(UO2)2(VO4)2·3H2

Optical Spectra of Carpholite, MnAl2(Si2O6)(OH)4

Optical Spectra of Cassiterite, SnO

Optical Spectra of Celestine, SrSO

Optical Spectra of Chalcanthite, CuSO4·5H2

Optical Spectra of Chalcomenite, CuSeO3·2H2

Optical Spectra of Chalcophyllite, Cu18Al2(AsO4)4(SO4)3(OH)24·36H2O

Optical Spectra of Chenevixite, Cu2Fe2(AsO4)2(OH)

Optical Spectra of Chlorites, (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6 

Optical Spectra of Chromite, FeCr2O

Optical Spectra of 'Chrysocolla', (Cu,Al)2H2Si2O5(OH)4•nH2O

Optical Spectra of "Chrysotile", Mg3(Si2O5)(OH)4

Optical Spectra of Chukhrovite, Ca4.5Al2(SO4)F13·12H2

Optical Spectra of Clinochalcomenite, CuSeO3·2H2

Optical Spectra of Clinochlore, Mg5Al(AlSi3O10)(OH)

Optical Spectra of Clinohumite, Mg9(SiO4)4F2

Optical Spectra of Clintonite, CaAlMg2(SiAl3O10)(OH)

Optical Spectra of Clinozoisite, Ca2Al3(Si2O7)(SiO4)O(OH) 

Optical Spectra of Coalingite, Mg10Fe2(OH)24[CO3]·2H2

Optical Spectra of Cobaltite, CoAsS 

Optical Spectra of Cobaltomenite, CoSeO3·2H2

Optical Spectra of Condrodite, (Mg,Fe)5(SiO4)2(F,OH)

Optical Spectra of Conichalcite, CaCu(AsO4)(OH) 

Optical Spectra of Connellite, Cu19(SO4)(OH)32Cl4·3H2

Optical Spectra of Copiapite, Fe2+Fe3+4(SO4)6(OH)2·20H2

Optical Spectra of Coquimbite, AlFe3(SO4)6(H2O)12·6H2

Optical Spectra of Cornetite, Cu3(PO4)(OH)

Optical Spectra of Corvusite, (Na,Ca,K)(V5+,V4+,Fe)8O20·4H2O

Optical Spectra of Covellite, CuS 

Optical Spectra of Crocoite, PbCrO4

Optical Spectra of Cuprorivaite, CaCuSi4O10 

Optical Spectra of Delvauxite, ~CaFe4(PO4,SO4)2(OH)8·4-6H2O

Optical Spectra of Demesmaekerite, Pb2Cu5(UO2)2(SeO3)6(OH)6·2H2

Optical Spectra of Derriksite, Cu4(UO2)(SeO3)2(OH)

Optical Spectra of Descloizite, PbZn(VO4)(OH)  

Optical Spectra of Dioptase, CuSiO3·H2

Optical Spectra of Erythrite, Co3(AsO4)2·8H2O)

Optical Spectra of Eveite, Mn2(AsO4)(OH)

Optical Spectra of Falcondoite, Ni4Si6O15(OH)2·6H2

Optical Spectra of Fenaksite, KNaFeSi4O10 

Optical Spectra of Ferrimolybdite, Fe2(MoO4)3·7H2

Optical Spectra of Fluocerite, (Ce,La)F3

Optical Spectra of Friedelite, Mn8Si6O15(OH)10 

Optical Spectra of Gadolinite, Ce2Fe2+Be2O2(SiO4)2

Optical Spectra of Gahnite

Optical Spectra of Galaxite, MnAl2O4

Optical Spectra of Gagarinite, NaCaCeF

Optical Spectra of Garnierite, a mixture

Optical Spectra of Gaspeite, NiCO3

Optical Spectra of Genthelvite, Be3Zn4(SiO4)3

Optical Spectra of Getchellite, SbAsS

Optical Spectra of Glaucochroite, CaMn(SiO4)

Optical Spectra of 'Glauconite', (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2

Optical Spectra of Gormanite, Fe3Al4(PO4)(OH)·2H2O

Optical Spectra of Graemite, Cu(TeO3)·H2

Optical Spectra of Guildite, CuFe(SO4)2(OH)·4H2O

Optical Spectra of Guilleminite, Ba(UO2)3(SeO3)2O2·3H2O

Optical Spectra of 'Hackmanite', Na8Al6Si6O24(Cl2,S)

Optical Spectra of Halloysite, Al2(Si2O5)(OH)4

Optical Spectra of Hammarite, Pb2Cu2Bi4S9

Optical Spectra of Haradaite, SrVSi2O7

Optical Spectra of Haynesite, (UO2)3(OH)2(SeO3)2·5H2O  

Optical Spectra of Hedyphane, Ca2Pb3(AsO4)3Cl

Optical Spectra of Hewettite, CaV6O16·9H2O

Optical Spectra of Hübernite, Mn(WO4)

Optical Spectra of Humite, (Mg,Fe)7(SiO4)3(F,OH)2

Optical Spectra of Hydroxylherderite, CaBePO4OH

Optical Spectra of Inesite, Ca2Mn2+7Si10O28(OH)2·5H2O

Optical Spectra of Iowaite, Mg6Fe2(OH)16Cl2·4H2O

Optical Spectra of Jadeite and 'Jade', NaAlSi2O6

Optical Spectra of Karrooite, MgTi2O5

Optical Spectra of "Kerchenite", an iron phosphate mixture

Optical Spectra of Kerolite, Mg3Si4O10(OH)2·H2O

Optical Spectra of 'Knebelite', (FeMn)2SiO4

Optical Spectra of Lamprophyllite, (SrNa)Ti2Na3Ti(Si2O7)2O2(OH)2

Optical Spectra of Langbeinite, K2Mg2(SO4)3

Optical Spectra of 'Lapis Lazuli'

Optical Spectra of Laurentthomasite, KMg2AlBe2Si12O30

Optical Spectra of Lazurite, Na3Ca(Si3Al3)O12

Optical Spectra of Leucophoenicite, Mn7(SiO4)3(OH)2

Optical Spectra of Libethenite, Cu2(PO4)(OH)

Optical Spectra of Linarite, PbCu(SO4)(OH)2

Optical Spectra of Lithiophilite, LiMn(PO4)

Optical Spectra of Lovchorrite, (◻,Ca,Na)3(Ca,REE)4Ti(Si2O7)2[H2O,OH,F]4·H2O

Optical Spectra of Leucopoenicite, Mn7(SiO4)3(OH)2

Optical Spectra of Maganosite, MnO

Optical Spectra of Magnesioferrite, MgFe2O4

Optical Spectra of Magnesite, MgCO3

Optical Spectra of Malachite, Cu2CO3(OH)2

Optical Spectra of Melanocerite, (Ce,Ca)5(SiO4,BO4)3(OH,O)

Optical Spectra of Meta-autunite, Ca(UO2)2(PO4)2·6H2O

Optical Spectra of Metahewettite, CaV6O16·3H2O

Optical Spectra of Metatorbernite, Cu(UO2)2(PO4)2·8H2O

Optical Spectra of Metazeunerite, Cu(UO2)2(AsO4)2·8H2 

Optical Spectra of Mimetite, Pb5(AsO4)3Cl

Optical Spectra of Mitridatite, Ca2Fe3O2(PO4)3·3H2 

Optical Spectra of Mosandrite, (Ca3REE)[(H2O)2Ca0.5[]0.5]Ti(Si2O7)2(OH)2(H2O)2 

Optical Spectra of Natrolite, Na2(Si3Al2)O10·2H2O

Optical Spectra of Népouite, Ni3Si2O5(OH)4

Optical Spectra of Nullaginite, Ni2(CO3)(OH)2

Optical Spectra of Olivenite, Cu2(AsO4)(OH)

Optical Spectra of Opal, SiO2·nH2O

Optical Spectra of Otwayite, Ni2(CO3)(OH)2·H2O

Optical Spectra of Oxykerchenite, BaMg2TiO2(Si2Al2)O10

Optical Spectra of Pascoite, Ca3V10O28·17H2O

Optical Spectra of Pecoraite, Ni3Si2O5(OH)4  

Optical Spectra of Pectolite, NaCa2Si3O8(OH)

Optical Spectra of "Picite", ~CaFe4(PO4,SO4)2(OH)8·4-6H2O

Optical Spectra of Piemontite, Ca2Al2Mn(Si2O7)(SiO4)O(OH)

Optical Spectra of Pimelite, Ni3Si4O10(OH)2·4H2O

Optical Spectra of Plancheite. Cu8(Si8O22)(OH)4·H2

Optical Spectra of Polydymite, NiNi2S4

Optical Spectra of Prehnite, Ca2Al2Si3O10(OH)

Optical Spectra of Proustite, Ag3AsS

Optical Spectra of Pseudomalachite, Cu5(PO4)2(OH)

Optical Spectra of Pucherite, BiVO4 

Optical Spectra of Pyrargyrite, Ag3SbS

Optical Spectra of Pyrite, FeS

Optical Spectra of Pyromorphite, Pb5(PO4)3Cl 

Optical Spectra of Pyrophanite, MnTiO3

Optical Spectra of Pyroxmanganite, MnSiO

Optical Spectra of Renierite, (Cu,Zn)11Fe4(Ge,As)2S16

Optical Spectra of Rhabdophane, Ce(PO4)·H2O  

Optical Spectra of Rhodonite, CaMn3Mn[Si5O15]

Optical Spectra of Rinkite-(Ce), Na2Ca4CeTi(Si2O7)2OF2

Optical Spectra of Rinkolite, (◻,Ca,Na)3(Ca,REE)4Ti(Si2O7)2[H2O,OH,F]4·H2O

Optical Spectra of Rodalquilarite, H3Fe2(TeO3)4Cl

Optical Spectra of Rosasite, CuZn(CO3)(OH)

Optical Spectra of Roscoelite, KV2(Si3Al)O10(OH)2

Optical Spectra of Sarkinite, Mn2(AsO4)(OH) 

Optical Spectra of Satterlyite, (Fe)12(PO3OH)(PO4)5(OH,O)

Optical Spectra of Scorodite, FeAsO4·2H2O

Optical Spectra of Sekaninite, Fe2Al3(AlSi5O18)    

Optical Spectra of Sepiolite, Mg4(Si6O15)(OH)2·6H2

Optical Spectra of Serandite, NaMn2Si3O8(OH) 

Optical Spectra of Serpentines, Mg3[Si2O5](OH)

Optical Spectra of Shattuckite, Cu5(Si2O6)2(OH)

Optical Spectra of Sinhalite, MgAl(BO4) 

Optical Spectra of Smirnite, Bi2TeO

Optical Spectra of Stichtite, Mg6Cr2(OH)16[CO3]·4H2

Optical Spectra of Stringhamite, CaCu(SiO4)·H2

Optical Spectra of Sulfo Salts

Optical Spectra of Sussexite, MnBO2(OH)

Optical Spectra of Taaffeites, BeMg3Al8O16

Optical Spectra of Takovite, Ni6Al2(OH)16[CO3]·4H2O

Optical Spectra of Talc, Mg3Si4O10(OH)2

Optical Spectra of "Tawmanite', Cr-rich epidote

Optical Spectra of Teineite, Cu(TeO3)·2H2O

Optical Spectra of Tennantite, Cu12As4S13 

Optical Spectra of TephroiteMn2SiO4       

Optical Spectra of Tetrahedrite, Cu6(Cu4Fe2)Sb4S12S

Optical Spectra of Thalenite-(Y), Y3Si3O10F

Optical Spectra of Tlapallite, H6(Ca,Pb)2(Cu,Zn)3O2(SO4)(Te4+O3)4(Te6+O4)

Optical Spectra of Tornebohmite, (Ce,La)2Al(SiO4)2(OH)

Optical Spectra of Turquoise, CuAl6(PO4)4(OH)8·4H2O

Optical Spectra of Tyuyamunite, Ca(UO2)2(VO4)2·5-8H2O

Optical Spectra of Ullmannite, NiSbS

Optical Spectra of Uranyl Minerals, UO22+

Optical Spectra of Ussingite, Na2AlSi3O8OH

Optical Spectra of Vanadinite, Pb5(VO4)3Cl 

Optical Spectra of Voglite, Ca2Cu(UO2)(CO3)4·6H2O

Optical Spectra of Wavellite, Al3(PO4)2(OH,F)3·5H2O 

Optical Spectra of Widgiemoolthalite, Ni5(CO3)4(OH)2·5H2O

Optical Spectra of Wurtzite, 

Optical Spectra of Xocomecatlite, Cu3(TeO4)(OH)4

Optical Spectra of Yoderite, MgAl3(SiO4)2O(OH)

Optical Spectra of Zaratite, Ni3(CO3)(OH)4·4H2O

Optical Spectra of Zincite, ZnO