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Sillimanite Var Fibrolite

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PDM688981

Sillimanite Var Fibrolite

Classic Locality

Description Tabs

Description
Locality: 
Horcajuelo de la Sierra, Madrid, Spain
Class: 
Crystal Group/Cluster
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.3 × 6.5 × 3.6 cm
Description

Rich specimen of good size of a metamorphic rock composed almost exclusively by a white fibrous mass of sillimanite, variety fibrolite, with minor yellow quartz.

Self-collected in 2014 at Horcajuelo de la Sierra (Madrid) the type locality of rutile.

Mineral Data
What's on the rock

Sillimanite

Formula: 
Al2(SiO4)O
Strunz: 
9.AF.05
Crystal System: 
Orthorhombic
Hardness: 
6.5 - 7.5
Streak: 
white
Type Locality: 
Chester, Middlesex Co., Connecticut, USA

Fibrolite

Variety Of: 

Sillimanite

Formula: 
Al2(SiO4)O
Strunz: 
9.AF.05
Hardness: 
6.5 - 7.5
Hardness: 
0.0
Type Locality: 
Carnatic Coast (Karnatak), Tamil Nadu, India

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