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Feldspar Var Anorthite

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LGM146537

Feldspar Var Anorthite

Ex Dr. Schwartz, Bonn, Germany
Classic Locality

Description Tabs

Description
Locality: 
Tori Island, Izu Archipelago, Tokyo Metropolis, Honshu Island, Japan
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 1.5 × 1.3 cm
Largest Crystal: 
2.00cm
Weight: 
14.00gr
Description

Anorthite is the calcium-rich end member of the albite-anorthite feldspar series. Here is a set of four anorthite crystal groupings. They are coated with dark grey, solidified lava. The bigger ones are quite well crystallized and consist of two main, intergrown crystals (likely a twin) and some smaller ones attached. The size of the smallest specimen is appr. 1 cm.
From an unusual locality: Miyake Island is a small island with an active volcano and is famous as the classic locality for anorthite crystals, thousands of which were thrown out loose by the 1870 eruption and distributed in collections around the world.

Mineral Data
What's on the rock

Feldspar

Group Parent: 
Feldspar Group

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

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