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Tourmaline Var Dravite With Calcite

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QRI643910

Tourmaline Var Dravite With Calcite

Classic Locality

Description Tabs

Description
Locality: 
Crevoladossola Quarry, Ossola Valley, Verbano-Cusio-Ossola Province, Piedmont, Italy
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.4 × 6.1 × 3.7 cm
Largest Crystal: 
1.50cm
Weight: 
103.00gr
Description

From the Crevoladossola marble quarries, a nice specimen of dravite individuals on white calcite. The crystals are elongated, brown and with good lustre. The main dravite group shows a St. Andrew's cross shape, and its tips display a partial transparency. Most of the crystals are well terminated.
A sought-after Alpine specimen, dated back to the late 80s. Scarce material.

Mineral Data
What's on the rock

Tourmaline

Formula: 
A(D3)G6(T6O18)(BO3)3X3Z
Crystal System: 
Trigonal
Hardness: 
7

Dravite

Formula: 
Na(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
Strunz: 
9.CK.05
Crystal System: 
Trigonal
Hardness: 
7.0
Type Locality: 
Dobrova, Dravograd (Unterdrauburg), Slovenia

Calcite

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

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