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Augite Anorthite & Vesuvianite

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PDM581445

Augite Anorthite & Vesuvianite

Ex. Stockholms Högskolas Mineralogiska Institution
With Antique Label

Description Tabs

Description
Locality: 
Somma-Vesuvius, Naples Province, Campania, Italy
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.8 × 5.1 × 3.4 cm
Description

Sharp black augite crystals on a matrix with white anorthite and green vesuvianite. According to the label it is from the eruption of 1822.

Ex. Stockholms Högskolas Mineralogiska Institution, section Smith’s Collection.

Mineral Data
What's on the rock

Augite

Formula: 
(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Strunz: 
9.DA.15
Crystal System: 
Monoclinic
Hardness: 
5.5 - 6.0

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

Vesuvianite

Formula: 
(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
Strunz: 
9.BG.35
Hardness: 
6.5
Streak: 
White
Type Locality: 
Monte Somma, Somma-Vesuvius Complex, Naples Province, Campania, Italy

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