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Magnetite Actinolite Andradite & Schorl

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PJM38510

Magnetite Actinolite Andradite & Schorl

Description Tabs

Description
Locality: 
Biggenden Mine, North Burnett Region, Queensland, Australia
Size Range: 
Cabinet (10-18 cm)
Size: 
4.5 × 10.6 × 6.6 cm
Description

Lusterous magnetite crystals have grown over a bed of andradite crystals with minor actinolite, the back of the specimen is liberally dusted with small black schorl crystals

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

Andradite

Formula: 
Ca3Fe3+2(SiO4)3
Strunz: 
9.AD.25
Crystal System: 
Isometric
Hardness: 
6.5 - 7.0
Streak: 
White
Type Locality: 
Drammen, Buskerud, Norway

Schorl

Formula: 
Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Strunz: 
9.CK.05
Hardness: 
7.0
Earthstones Australia

Seller Information

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