Mica (silicates): xanthophylls
Diagnostic Card.
Ca (Mg, Al) 3 (OH) 2 Al 2 Si 2 O 10
Crystal system monoclinic
Hardness of 3.5 and 6, depending on the direction
The proportion of 3-3.1
Cleavage along the bottom, perfect
Color light yellow, green, red and brown
Gloss glass
Xanthophylls reminds biotite, the name associated with his yellowish or brownish color ( "Xanthos" is Greek for yellow). Enriched iron called xanthophylls brandizitom.
Xanthophylls refers to a group of brittle mica. It crystallizes in the monoclinic system in the form of small plates pseudohexagonal fragile. Colouring light yellow, green or brownish-red. Gloss glass, perfect cleavage parallel to the base.
Origin.
Xanthophylls in association with talc timed to epizony metamorphic rocks, such as chlorite and talc schists. Together with the spinel, grossular, calcite and other minerals, it is observed in the contact metamorphic limestone.
Deposits and application.
It is found near the town of Zlatoust in South Ural, Kverigute in the Pyrenees and, together with calcite and monticellite in Crestmore in California (USA). In Italy, it was observed in the rocks of the Adamello group.
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