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Orthoclase With Aegirine

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SMS1088280

Orthoclase With Aegirine

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Description
Locality: 
Mount Malosa, Zomba, Southern Region, Malawi
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.5 × 3.1 × 2.4 cm
Weight: 
18.61gr
Description

The specimen has a euhedral carlsbad twinned crystal of orthoclase on aegirine with goethite psm siderite on the aegirine. The feldspar has one large crystal with two smaller carlsbad twins making up a cluster. The feldspar has some dendritic growths on the surfaces. The aegirine is dark green rather than black and is grown over some of the crystal planes.

Mineral Data
What's on the rock

Orthoclase

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

Aegirine

Formula: 
NaFe3+Si2O6
Group Parent: 
Clinopyroxene Subgroup
Strunz: 
9.DA.25
Crystal System: 
Monoclinic
Hardness: 
6.0
Type Locality: 
Rundemyr, Øvre Eiker, Buskerud, Norway

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