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Andradite Quartz & Hedenbergite

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PFK540887

Andradite Quartz & Hedenbergite

Classic Locality

Description Tabs

Description
Locality: 
Avissalos, Serifos Island, Milos, South Aegean, Greece
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
8 × 7.8 × 4 cm
Description

This is a fine, classic example of Seriphos andradite. Reddish-brown, sharp, dodecahedral crystals of andradite are leaping out of a contrasting hedenbergite matrix. The bonus here is the quartz crystals which are perched on the andradites here and there. The quartz association is very unusual and is a typical characteristic of this find!

Mineral Data
What's on the rock

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

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White

Hedenbergite

Formula: 
CaFe2+Si2O6
Group Parent: 
Clinopyroxene Subgroup
Strunz: 
9.DA.15
Hardness: 
5.5 - 6.5
Type Locality: 
Mormorsgruvan, Tunaberg Cu-Co Ore Field, Tunaberg, Nyköping, Södermanland, Sweden

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