Mineralpedia Details for Kinoshitalite

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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: View Kinoshitalite
Mindat: View Kinoshitalite

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 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.