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Spinel & Humite

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PDM800246

Spinel & Humite

Description Tabs

Description
Locality: 
Betroka District, Anosy, Madagascar
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.6 × 3.4 × 3.2 cm
Description

Octahedral crystals of spinel with dark blue-black colour and rounded edges, associated to brown humite, that are implanted in a matrix of crystallized calcite.

Acquired in 1985. Ex Dr. Bob Janssens #253.

Mineral Data
What's on the rock

Spinel

Formula: 
MgAl2O4
Strunz: 
4.BB.05
Crystal System: 
Isometric
Hardness: 
7.5 - 8.0

Humite

Formula: 
(Mg,Fe2+)7(SiO4)3(F,OH)2
Strunz: 
9.AF.50
Crystal System: 
Orthorhombic
Hardness: 
6.0
Type Locality: 
Monte Somma, Somma-Vesuvius Complex, Naples Province, Campania, Italy

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