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Corundum Var Sapphire & Rutile Var Strüverite

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CLB600729

Corundum Var Sapphire & Rutile Var Strüverite

ex collection Eugen Kreidler, ex Lüttke
Classic Locality

Description Tabs

Description
Locality: 
Etta Mine, Keystone, Pennington County, South Dakota, United States of America
Class: 
Combination
Size Range: 
Small cabinet (7-10 cm)
Size: 
7 × 4.5 × 4.3 cm
Largest Crystal: 
1.40cm
Description

Several sapphire crystals on matrix with some black mineral - most likely strüverite.

Old find, most probably late 19th century.

With old label.

Mineral Data
What's on the rock

Corundum

Formula: 
Al2O3
Strunz: 
4.CB.05
Crystal System: 
Trigonal
Hardness: 
9.0
Streak: 
White

Sapphire

Variety Of: 

Corundum

Formula: 
Al2O3
Strunz: 
4.CB.05
Hardness: 
9.0
Formula: 
Al2O3
Hardness: 
0.0

Rutile

Formula: 
TiO2
Strunz: 
4.DB.05
Crystal System: 
Tetragonal - Ditetragonal Dipyramidal
Hardness: 
6.0 - 6.5
Type Locality: 
Rutile locality, Horcajuelo de la Sierra, Madrid, Spain

Strüverite

Variety Of: 

Rutile

Formula: 
TiO2
Strunz: 
4.DB.05
Hardness: 
6.0 - 6.5
Formula: 
(Ti,Ta,Fe)O2
Hardness: 
6.0 - 6.5

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