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Tourmaline Var Schorl

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LGM702708

Tourmaline Var Schorl

Ex Dr. Krantz, Bonn, Germany
With Antique Label

Description Tabs

Description
Locality: 
Zillertal, Tyrol, Austria
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
5 × 7 × 4 cm
Largest Crystal: 
3.00cm
Weight: 
210.00gr
Description

Acicular, lustrous black tourmaline var schorl crystals randomly in-grown in greenish-silvery mica schist. 

This is a very old specimen, coming with a rare label from old Dr. A. Krantz dated to 1830-1850. The company's location "Berlin" at the bottom of the label gives a hint that the specimen dates back before the movement from Berlin to Bonn in 1850.
The most of these old "Berlin" labels show a canceled "Berlin" and subsequent stamped "Bonn" for the new head office location.

Mineral Data
What's on the rock

Tourmaline

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

Schorl

Formula: 
Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Strunz: 
9.CK.05
Hardness: 
7.0

Seller Information

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