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Mica Group

The most common of the Mica Group minerals, it is typically found as massively crystalline material in "books" or in flaky grains as a constituent of many rock types. It is clear with a pearly luster on cleavage faces, often having a sparkly look in rocks.

 

It can form a continuous series with celadonite and aluminoceladonite; intermediates are known as the variety phengite and K-deficient variants as illite

 

Classification of Mica

IMA status : Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"

Explanation of status : Officially approved by the Mica Subcommittee 1998.

Strunz 8th edition ID : 8/H.10-70

 

Occurrences of Mica

Geological Setting : Mica is common in many different rock types as a primary mineral.

 

Physical Properties of Mica

Lustre : Vitreous, Silky, Pearly

Diaphaneity (Transparency) : Transparent, Translucent

Colour : White to colorless, silvery-white, and tinged various colors by impurities.

Streak : White

Hardness (Mohs) : 2

Hardness Data : Measured

Comment : 2.5 parallel to [001], 4 perpendicular to [001]

Tenacity : Elastic

Cleavage : Perfect Perfect on {001}.

Parting : On {110} and {010}.

Fracture : Micaceous

Density (measured) : 2.77 - 2.88 g/cm3

Density (calculated) : 2.83 g/cm3