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Mineralpedia Details for Tobelite

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Tobelite

Tobelite

Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Dioctahderal with Al3+,, OH at the (A) and dominant NH4>K at the interlayer position.

In Bernard & Hrysl "Minerals and Their Localities" describe this mineral as white to yellow to green clayed aggregates composed of tiny flakes. Mindat list five worlwide localties, one in the USA as Five Mile Pass, Utah. Maybe our friend Joe Marty will collect some fo this stuff for us.

More on rare mica minerals

Formula
(NH4)Al2(Si3Al)O10(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Massive - Fibrous, Scaly 
Cleavage
Perfect, None, None 
Luster
Vitreous - Silky 
Color
yellowish green, pearly white 
Streak
white 
Class
Monoclinic - Prismatic 
Hardness
WebMineral
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Mindat
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Tobelite from Ohgidani deposit, Tobe, Shikoku Island, Japan

Tobelite
            from Ohgidani deposit, Tobe, Shikoku Island, Japan

Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Dioctahderal with Al3+,, OH at the (A) and dominant NH4>K at the interlayer position.

In Bernard & Hrysl "Minerals and Their Localities" describe this mineral as white to yellow to green clayed aggregates composed of tiny flakes. Mindat list five worlwide localties, one in the USA as Five Mile Pass, Utah. Maybe our friend Joe Marty will collect some fo this stuff for us.

More on rare mica minerals

Compact white with submillimetric crystals.

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