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Anorthite

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ESM991986

Anorthite

Description Tabs

Description
Locality: 
Tolbachik Volcano, Kamchatka Krai, Russian Federation
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
1.5 × 1.3 × 1 cm
Description

A floater of intergrown brown anorthite (plagioclase) blades (1975-1976 southern breakthrough eruption)

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