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Almandine & Quartz

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RSL779608

Almandine & Quartz

Description Tabs

Description
Locality: 
Teofilo Otoni, Mucuri Valley, Minas Gerais, Brazil
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.5 × 4 × 4 cm
Description

Naturally rolled pebble, probably in a river, that shows a group of almandine crystals in the core. Very curious. From the former Joan Astor collection (Barcelona), well known Catalan mineralogist and photographer.

Acquired: 
1978
Mineral Data
What's on the rock

Almandine

Formula: 
Fe2+3Al2(SiO4)3
Strunz: 
9.AD.25
Crystal System: 
Isometric
Hardness: 
7.0 - 7.5
Streak: 
White
Type Locality: 
Alabanda, Aydin Province, Aegean Region, Turkey

Quartz

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