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Tourmaline Var Schorl

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LGM684061

Tourmaline Var Schorl

Ex Alex Franz coll., ex Chr. Rewitzer
With Antique Label

Description Tabs

Description
Locality: 
Snarum, Modum, Buskerud, Norway
Class: 
Single Crystal
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.5 × 1.5 × 1.5 cm
Weight: 
24.00gr
Description

A single tourmaline var schorl crystal, in good shape and with complete termination which is not self-evident for originally in-grown tourmaline crystals.

Alexander Franz was born in Göttingen in 1906. He was trained in optics at the Technical School in Jena, receiving his Master's Degree in 1929. He then joined his family's optics business in Hannover, managing it with the help of his brother in his early years, and thereafter by himself.
Franz became interested in minerals at an early age, and built a personal collection which unfortunately was lost during the chaos of the war years. Nevertheless, he built up a substantial new mineral collection following the war.
Franz died in Meerbusch, near Düsseldorf, on October 25, 2000. His collection was purchased by the mineral dealer Christian Rewitzer in Furth im Wald, and the specimens were then sold off individually.

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

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