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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, North Tyrol, 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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Thank you for viewing my auctions! Maintaining high standards in customer service is extremely important to me. If shipping takes longer than expected, please contact me. It is possible to file an investigation request, and during nearly ten years of e-rocks NO parcel was finally lost.

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I will happily do all in my power to resolve the situation to your satisfaction.

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