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Almandine With Arfvedsonite

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PDM881411

Almandine With Arfvedsonite

Description Tabs

Description
Locality: 
Kamiaba, Haut-Katanga, DR Congo
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.4 × 5.3 × 4 cm
Largest Crystal: 
1.50cm
Weight: 
92.00gr
Description

Dark red trapezohedral almandine crystals with good definition of stepped and lustrous faces. They are imbedded in pale cream coloured calcite matrix a grey rock that includes black striated arfvedsonite crystals and minor quartz. Found at the Kamiaba region, a very remote locality near the border with Zambia. Uncommon locality in collections, that has never been abundant at all.

Collected before 1960, the specimen is from the stock of Robert Verdoodt, who was working in the laboratories of Union Minière du Haut-Katanga and evacuated to Belgium in 1960.

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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

Arfvedsonite

Formula: 
[Na][Na2][Fe2+4Fe3+]Si8O22(OH)2
Strunz: 
9.DE.25
Hardness: 
5.0 - 6.0
Type Locality: 
Kangerluarsuk Fjord (Kangerdluarssuq Fjord), Ilímaussaq complex, Narsaq, Kujalleq, Greenland

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