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K Feldspar Var Adularia

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PDM749319

K Feldspar Var Adularia

Description Tabs

Description
Locality: 
Imilchil, Errachidia Province, Drâa-Tafilalet Region, Morocco
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4.4 × 2.7 × 2.6 cm
Description

Floater aggregate of K feldspar, variety adularia, with incipient “adularescence”, slightly strong enough to call it moonstone.

The exact locality was not revealed when I bought a small group of such pieces at Imilchil back in 2009. Miners told me that they were completely covered by a powdery iron oxides, and the “geode” was just about 20 cm in size. Anyway, such adularia specimens are very uncommon at the Imilchil area, and they have an important geological significance.

Found in 08/2009.

Mineral Data
What's on the rock

K Feldspar

Synonym Of: 

Microcline

Formula: 
KAlSi3O8
Strunz: 
9.FA.30
Hardness: 
6.0 - 6.5

Orthoclase

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

Sanidine

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

Adularia

Formula: 
KAlSi3O8
Strunz: 
9.FA.30
Crystal System: 
Monoclinic
Hardness: 
6 Ortho - clase

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