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Magnetite & Actinolite

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ZLT623635

Magnetite & Actinolite

Description Tabs

Description
Locality: 
Timmelbach Valley, Prägraten, Virgen Valley, East Tyrol, Tyrol, Austria
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 2.5 × 2 cm
Description

Cluster of actinolite crystals with black octaherdons attached. Covering calcite was removed with acetic acid. Unusual sample from a apline cleft.

Mineral Data
What's on the rock

Magnetite

Formula: 
Fe2+Fe3+2O4
Strunz: 
4.BB.05
Crystal System: 
Isometric
Hardness: 
5.5 - 6.5
Streak: 
Black

Actinolite

Formula: 
☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Strunz: 
9.DE.10
Crystal System: 
Monoclinic - Prismatic
Hardness: 
5.0 - 6.0
Streak: 
White

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