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Calcite & Amethyst

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SCH77209

Calcite & Amethyst

Ex. Monmonier; Ex. University of Arizona

Description Tabs

Description
Locality: 
Guanajuato, Guanajuato Municipality, Guanajuato, Mexico
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.9 × 5.7 × 2.4 cm
Description

An aesthetic specimen of lavender amethyst crystals with one side of the thin, banded, amethyst crust festooned with very striking, layered, "sandwich style", poker-chip calcite crystals. The poker-chip crystals are coated with a druse of secondary calcite, giving them an interesting sugary appearance.  This specimen was originally in the Hubert de Monmonier collection and was donated to the University of Arizona Mineral Museum in May of 2007.

Mineral Data
What's on the rock

Calcite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White

Amethyst

Variety Of: 

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Hardness: 
7.0
Formula: 
SiO2
Hardness: 
0.0
Colour: 
Purple
schani

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