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Mullite Magnetite & Corundum

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HCH102140

Mullite Magnetite & Corundum

Type Locality

Description Tabs

Description
Locality: 
Loch Scridain, Isle of Mull, Scotland, United Kingdom
Size Range: 
Small cabinet (7-10 cm)
Size: 
8 × 3 × 2.5 cm
Largest Crystal: 
0.10cm
Description

Intergrown pale pink prismatic crystals of mullite up to 1 mm length in parageneses of some octaeders of magnetite, darkblue grains of corundum and whiteish unspectacular stellerite/barrerite in magmatite. Mullite from its typlocality!

Mineral Data
What's on the rock

Mullite

Formula: 
Al4+2xSi2-2xO10-x
Strunz: 
9.AF.20
Crystal System: 
Orthorhombic
Hardness: 
6.0 - 7.0
Type Locality: 
Seabank Villa, Isle of Mull, Strathclyde (Argyllshire), Scotland, UK

Magnetite

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

Corundum

Formula: 
Al2O3
Strunz: 
4.CB.05
Crystal System: 
Trigonal
Hardness: 
9.0
Streak: 
White

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