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Tourmaline With Cookeite & Quartz

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QRI775926

Tourmaline With Cookeite & Quartz

Former collection Kasper (CH)
Classic Locality

Description Tabs

Description
Locality: 
Cruzeiro Mine, São José da Safira, Minas Gerais, Brazil
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.3 × 5.7 × 3.6 cm
Largest Crystal: 
1.50cm
Weight: 
72.00gr
Description

Sculptural group of hyaline quartz mostly covered with creamy yellow cookeite and a few deep gree, partly transparent indicolite crystals. Both quartz and tourmaline are quite lustrous and in overall good quality, providing some peripheral contacts and - in the case of the thinner tourmaline - missing terminations.

Quite rich, not seen very often nowadays. Former collection Kasper (CH).

Pasted Label
Mineral Data
What's on the rock

Tourmaline

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

Cookeite

Formula: 
(Al2Li)Al2(AlSi3O10)(OH)8
Strunz: 
9.EC.55
Hardness: 
2.5 - 3.5
Streak: 
White
Type Locality: 
Mount Mica Quarry (Mount Mica Mine), Paris, Oxford Co., Maine, USA

Quartz

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

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