Lepidomelane Composition, Crystallization & Structure

A mica, that may be regarded as a variety of biotic, characterized by the large amount of ferric iron that it contain, (H, K)2 Fe 3 (fe, Al)4- (SiO4)5(?). Monoclinic. In small hexagonal-shaped tables, or as an aggregate of minute scales. Perfect basal cleavage. H. = 3. G. =3-23. Adamantine to pearly luster. Color black to greenish black. Opaque or translucent in very thin lamine. Fuses at 4.5-5 to a magnetic globule. Decomposed by hydrochloric acid A comparatively rare mineral, found chiefly in pegmatitic granites and syenites.

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