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Mineralpedia Details for Kinoshitalite

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Kinoshitalite

Kinoshitalite

Formula
BaMg3(Si2Al2)O10(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Scaly 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
yellow brown, colorless 
Streak
yellow white 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
2.5-3 
WebMineral
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Mindat
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Kinoshitalite from Trumbull Peak, Mariposa Co., California, United States

Kinoshitalite
            from Trumbull Peak, Mariposa Co., California, United States

Golden thin mica flakes throughout matrix of Sanbornite and Gillespite (red). Kinoshitalite is a rare member of the mica group.

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Kinoshitalite from Hokkejino, Kizugawa City, Kyoto, Kinki Region, Honshu Island, Japan

Kinoshitalite
            from Hokkejino, Kizugawa City, Kyoto, Kinki Region, Honshu Island, Japan

Kinoshitalite is a trioctahedral brittle mica which occurs as minutes flakes in this matrix with Rhodonite (pink) and probably Sonolite.

Tiny, less than 0.5mm, scales in Quartz rich matrix.

Kinoshitalite is a phyllosilicate and monoclinic and a mica group member. It is a brittle mica and trioctahedral. Barium occupies the Interlayer (I) cation positions with Mg at the (M) sites.  May contain Mn and Ti. For more information on Mica minerals and other phyllosilicates please reference our article - Click Here.

It typically occurs as scales to 1mm, yellow-brown, in Mn-rich marbles and skarns and in metamorphc granulite facies of Mn ore  deposits (Bernard & Hrysl). It is associated with haussmanite, tephroite ore in Japan. Only 2 US localities  and Langban per Mindat.

This specimen shows tiny yellowish platelets.

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