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Albite Psm Feldspar & Aegirine

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KMF667296

Albite Psm Feldspar & Aegirine

ex Uli Bahmann
Classic Locality

Description Tabs

Description
Locality: 
Mount Malosa, Zomba, Southern Region, Malawi
Class: 
Combination
Size Range: 
Cabinet (10-18 cm)
Size: 
11.5 × 10.5 × 6 cm
Description

Ex A&U Bahmann, at 11.5cm this aesthetic specimen is certainly bold and impressive in nature since it might look as if it is heavily contacted to the periphery of the feldsar matrix yet under closer inspection you will note that every conceivable surface has been recrystallized or mineralized over by later developments.

Up close you will recognize how the feldspar is skeletal in structure, the surface is translucent consisting of a replacement of the original feldspar by albite. In some areas you can see into the feldspar to observe multiple layers of alteration and mineralization of green aegerine within the skeletal structure. The matrix obviously broke off its host environment at some earlier stage of development then rehealed.

Similarly the large vertically orientated aegerine crystal too may have broken off and rehealed itself visible as a distinctive bend about half way up. All in all a very unique Malawi mineral specimen from a well known and highly regarded mineral collector.

Mineral Data
What's on the rock

Albite

Formula: 
NaAlSi3O8
Strunz: 
9.FA.35
Crystal System: 
Triclinic
Hardness: 
6.0 - 6.5
Streak: 
White
Type Locality: 
Finnbo (Finbo), Falun, Dalarna, Sweden

Feldspar

Group Parent: 
Feldspar Group

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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