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Tridymite & Muscovite

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SMM649105

Tridymite & Muscovite

Description Tabs

Description
Locality: 
Funtanafigu Quarry, Marrubiu, Oristano Province, Sardinia, Italy
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.5 × 2.2 × 2 cm
Description

Hexagonal, milky-colorless crystals of tridymite and reddish muscovite in a vug of  "rhyolite-rock".

Boxed with Label
Mineral Data
What's on the rock

Tridymite

Formula: 
SiO2
Strunz: 
4.DA.10
Crystal System: 
Triclinic - Pedial
Hardness: 
6.5 - 7.0
Streak: 
White
Type Locality: 
Cerro San Cristóbal, Mun. de Pachuca, Hidalgo, Mexico

Muscovite

Formula: 
KAl2(AlSi3O10)(OH)2
Strunz: 
9.EC.15
Hardness: 
2.5
Streak: 
White

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