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Vesuvianite (Idocrase) occurs as crystals in limestones that have been subjected to contact metamorphism. It was first discovered in or adjacent to lavas on Mount Vesuvius. Idocrase is the name sometimes used for gemstone quality vesuvianite.
Ca10(MgFe)2Al4(SiO4)5(Si2O7)2(OH)4 -
Calcium Magnesium Iron Aluminum Silicate Hydroxide
Class:
Subclass:
Brown, yellowish, green, blue, purple, colorless
White
Vitreous to dull
Transparent to translucent
3.3
6 - 7
Imperfect
Uneven to conchoidal
Prismatic to tabular crystals, columnar aggregates with radial structure, grannular, massive.
None
Frequency:
Uncommon
Origin:
Metamorphic and hydrothermal in contact metamorphosed calcium rich rocks, mainly in skarns, in marble contacts, also in rodingites; rarely magmatic in alkaline rocks. Usually associated with grossular, wollastonite and diopside.

Occurence:
Jeffrey quarry, Asbestos, Quebec, Canada; Hazlov, Czech Republic; Crestmore, California, USA; Franklin, New Jersey, USA; Sierra De Las Cruces, Coahuila, Mexico.
Application:
Idocrase (see above description) and as a mineral specimen.

 
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