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Anorthite

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LGM683910

Anorthite

Ex Dr. Krantz, Bonn, Germany
With Antique Label

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Description Tabs

Description
Locality: 
Tunaberg, Nyköping, Södermanland County, Sweden
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.5 × 5.5 × 2 cm
Weight: 
49.00gr
Description

Anorthite is the calcium-rich end member of the albite-anorthite series. This matrix piece is a very rare find from the historic mines at Tunaberg, famed for outstanding cobaltite crystals. The specimen features old-rose colored crystalline anorthite and grainy white quartz in black mica schist matrix.

This is a pretty old specimen, coming with a very 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 - but this one does not! "Amphodelit" is a synonym for anorthite ± illite, Hintze II, 1537 (1895).

Mineral Data
What's on the rock

Anorthite

Formula: 
CaAl2Si2O8
Strunz: 
9.FA.35
Crystal System: 
Triclinic
Hardness: 
6.0 - 6.5
Streak: 
White
Type Locality: 
Monte Somma, Somma-Vesuvius Complex, Naples Province, Campania, Italy

Seller Information

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