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Pigeonite & Forsterite

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UVM760949

Pigeonite & Forsterite

Rare Mineral

Description Tabs

Description
Locality: 
San Carlos Indian Reservation, Gila County, Arizona, United States of America
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4 × 3 × 2.1 cm
Description

Pigeonite intergrown with forsterite from the olivine bombs this locality is famous for.   Pigeonite is well known from meteorites, but terrestrial examples are very rare.   This is very good for the species, showing easily visible material appearing as though it had been cut with a butter knife.

Mineral Data
What's on the rock

Pigeonite

Formula: 
(Mg,Fe2+,Ca)(Mg,Fe2+)Si2O6
Group Parent: 
Clinopyroxene Subgroup
Strunz: 
9.DA.10
Hardness: 
6.0
Type Locality: 
Pigeon Point, Cook Co., Minnesota, USA

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

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