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Arfvedsonite On Orthoclase

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SMS1108462

Arfvedsonite On Orthoclase

Description Tabs

Description
Locality: 
Mount Malosa, Zomba, Southern Region, Malawi
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.4 × 3.9 × 2.6 cm
Weight: 
27.48gr
Description

The specimen has a twinned elongate black crystals of arfvedsonite on orthoclase. The arfvedsonite crystals are distinctive, marked by their striated ribbed surface finish. The crystal to 3.2cm.

Mineral Data
What's on the rock

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

Orthoclase

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

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