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Feldspar Var Anorthite

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TWH584194

Feldspar Var Anorthite

Classic Locality

Description Tabs

Description
Locality: 
Miyake Island, Miyake, Miyake Subprefecture, Tokyo Metropolis, Honshu Island, Japan
Class: 
Single Crystal
Size Range: 
Thumbnail (1-3cm)
Size: 
1.9 × 1.6 × 1.5 cm
Description

classic anorthite from a distant small island with active volcano outside of main island. The specimen is usually coated with a film of reddish or blackish glassy lava.

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
JohnTu's Attic