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Quartz On Calcite

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CLB100930

Quartz On Calcite

ex coll. Piero Marinai
Fluorescent

Description Tabs

Description
Locality: 
Volterra, Pisa Province, Tuscany, Italy
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3 × 3.2 × 1.2 cm
Largest Crystal: 
3.20cm
Description

Another unusual 'find' from an old collection. Very strangely shaped, multi-twinned (?) quartz crystals on a well terminated tabular calcite crystal floater. Never seen something like this before.

Mineral Data
What's on the rock

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White

Calcite

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

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