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Franklinite & Spessartine In Orthoclase

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PJM95626

Franklinite & Spessartine In Orthoclase

Description Tabs

Description
Locality: 
Koksha Valley, Badakhshan Province, Afghanistan
Size Range: 
Miniature (4.5-7 cm)
Size: 
5 × 3.8 × 2.9 cm
Description

Nestled in a cleaved block of orthoclase are several twinned franklinite crystals, sooty black in colour with a silky lustre. There are also numerous deep orange red spessarine crystal imbedded in the orthoclase.

Identification for the franklinite was provided by Ikram Mineralogy.

Mineral Data
What's on the rock

Franklinite

Formula: 
Zn2+Fe3+2O4
Strunz: 
4.BB.05
Crystal System: 
Isometric
Hardness: 
5.5 - 6.0
Colour: 
Black
Type Locality: 
Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA

Spessartine

Formula: 
Mn2+3Al2(SiO4)3
Strunz: 
9.AD.25
Crystal System: 
Isometric
Hardness: 
6.5 - 7.5
Streak: 
White
Type Locality: 
Sommer quarry, Wendelberg, Haibach, Aschaffenburg, Spessart, Franconia, Bavaria, Germany

Orthoclase

Formula: 
KAlSi3O8
Strunz: 
9.FA.30
Hardness: 
6.0
Streak: 
White
Earthstones Australia

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