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Pyrope Forsterite & Omphacite

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CLB172682

Pyrope Forsterite & Omphacite

Classic Locality

Description Tabs

Description
Locality: 
Vågsøy, Vestland, Norway
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.5 × 4 × 2.5 cm
Description

A very nice piece of a garnet-peridotite or eclogite from the earth's mantle, containing pyrope, omphacite, forsterite and possibly enstatite, diopside, spinel. Age 420 million years. Formed under high pressure whilst two tectonic plates collided.

Mineral Data
What's on the rock

Pyrope

Formula: 
Mg3Al2(SiO4)3
Strunz: 
9.AD.25
Crystal System: 
Isometric
Hardness: 
7.5
Streak: 
White
Type Locality: 
Czech Republic

Forsterite

Formula: 
Mg2SiO4
Strunz: 
9.AC.05
Crystal System: 
Orthorhombic
Hardness: 
7.0
Streak: 
White
Type Locality: 
Monte Somma, Somma-Vesuvius Complex, Naples Province, Campania, Italy

Omphacite

Formula: 
(Ca,Na)(Mg,Al)Si2O6
Group Parent: 
Clinopyroxene Subgroup
Strunz: 
9.DA.20
Hardness: 
5.0 - 6.0
Type Locality: 
Eclogite outcrops, Weißenstein, Stammbach, Münchberg Metamorphic complex, Franconia, Bavaria, Germany

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