Epidote Group Visible Spectra (350 - 1000 nm)

The common members of the epidote group minerals consist of allanite, clinozoisite, epidote, piemontite and zoisite. The color of clinozoisite and epidote is due to their Fe³⁺ content and commonly varies from amber to brown. Piemontite contains Mn³⁺ and is red. Allanite is colored by iron and radiation damage and possibly by rare earth elements. Zoisite is best known as the gem variety "tanzanite" which owes its color to vanadium.

• Images of representative epidote group spectra

• GRR 1282 amber clinozoisite spectrum, 6K; 1.10 mm thick sample from Gilgit, Pakistan. Data Files: perpendicular to c, 26K; parallel to c, 28K;
• GRR 1282 epidote spectrum, 6K; 1.104 mm thick sample from Gilgit, Pakistan. This is a different zone in the clinozoisite crystal portrayed above. Data Files: alpha, 26K; gamma, 28K;
• RDS 72 epidote spectrum, 6K; 1.0 mm thick olive-green crystal also from Pakistan with 8.84 wt% Fe₂O₃, described in Shannon & Rossman (1992) Phys Chem Min.
• GRR 438 epidote spectrum, 6K; 1.0 mm thick sample from an unspecified locality.
• GRR 1950 epidote spectrum 4K; 1.121 mm thick sample from northwestern Kenya. Green-brown British Museum sample 1973,589.
• GRR 2293 piemontite spectrum; 0.068 mm thick sample from Whitewater River, near Palm Springs, California. alpha, 21K; gamma, 23K;

• Data Files

• no other data files

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