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Quartz With Tourmaline

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JZM700890

Quartz With Tourmaline

Classic Locality

Description Tabs

Description
Locality: 
Butte, Silver Bow County, Montana, United States of America
Class: 
Crystal Group/Cluster
Size Range: 
Cabinet (10-18 cm)
Size: 
13.2 × 6.8 × 4.2 cm
Weight: 
403.00gr
Description

Very interesting oldtimer from Montana with fantastic Dr. F. Krantz label: Two parallel grown scepter quartz crystals with transluscent tops, a black coloured base and inclusions of yellowish muscovite. The specimen is described as "Pseudo smoky quartz" regarding to the black tourmaline inclusions which cause deep black colour. Sporadically the tourmaline is present on the surface.

Mineral Data
What's on the rock

Quartz

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

Tourmaline

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

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