Optical Spectra of Chlorite Group Minerals

• Bish DL (1977) An spectroscopic and X-ray study of the coordination of Cr³⁺ ions in chlorites. American Mineralogist 62, 385–389.
  

Chamosite

• Moëlo Y, Fritsch E, Gloaguen E, Rouer O (2020)  - Polygenic chamosite from a hydrothermalized oolitic ironstone
  (Saint-Aubin-des-Châteaux, Armorican Massif, France): crystal chemistry, visible–near-infrared spectroscopy (red variety) and geochemical significance - Clay Minerals 55, 83-95. doi:10.1180/clm.2020.13

Clinochlore

• Andrut M, Wildner M, Taran M, Langer K, Schulz R (1995) Temperature dependent polarized single crystal absorption spectra of kaemmererite. Physics and Chemistry of Minerals 23, 242–243.
  
• Platonow AN, Langer K, Calas G, Andrut M (1996) Optical absorption spectroscopy of Cr³⁺-ions in phyllosilicates. Physics and Chemistry of Minerals 23, 241-242.
  
• Czaja M, Kạdziołka-Gaweł M, Lisiecki R, Bodył-Gajowska S, Mazurak Z (2014)  Luminescence and other spectroscopic properties of purple and green-Cr-clinochlore. Physics and Chemistry of Minerals 41, 115-126.
  

Chloritoid, (Fe,Mg,Mn)Al₂(SiO₄)O(OH)₂ 

• Faye GH, Manning PB, Nicker EH (1968) The polarized optical absorption spectra of tourmaline, cordierite, chloritoid and viviianite: ferric-ferrous electron interaction as a source of pleochroism. American Mineralogist 53, 1174-1201. 1968.
• Bakhtin AI (1979) Crystal chemistry of iron in chloritoid according to the optical spectroscopy method (In Russian). Geokhimiya 7, 305-308.
• Hålenius U, Annersten H, Langer K (1981) Spectral studies on natural chloritoids. Physics and Chemistry of Minerals 7, 117-123.