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Almandine With Arfvedsonite

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PDM805028

Almandine With Arfvedsonite

Description Tabs

Description
Locality: 
Kamiaba, Haut-Katanga, DR Congo
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.3 × 5.3 × 3 cm
Largest Crystal: 
2.50cm
Description

Deep red lustrous rhombododecahedral crystal of almandine with good definition of stepped faces, in a matrix with black striated arfvedsonite crystals. The almandine has a contact with other crystals at one side but it has no damages.

Collected before 1960 at the Kamiaba region, a very remote locality close to the border with Zambia. Uncommon locality in collections, that has never been abundant at all. Ex Robert Verdoodt.

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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