biotite

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  • noun

Words related to biotite

dark brown to black mica found in igneous and metamorphic rock

References in periodicals archive ?
orthogneiss and biotitic paragneiss intruded by large bodies of leucocratic
The Train Lake Domain within the claim block consists of migmatitic orthogneiss and biotitic paragneiss intruded by large bodies of leucocratic granodiorite.
Drill targets have been generated through geological mapping and generally consist of areas where artisanal workings have exposed bedrock gold mineralization in sheared, shallow-dipping sections of garnetiferrous, quartzo-feldspathic and biotitic gneisses.
Where exposed, the diabase exhibits a biotitic alteration that indicates the presence of a buried copper mineral system.
To date geological mapping has documented numerous areas of artisanal bedrock mining operations hosted within shallow dipping garnetiferrous, quartzo-feldspathic and biotitic gneisses, scattered over a surface area of 14 square kilometres in the east-central portion of the Morogoro property.
Biotitic alteration occurs throughout the mineralized section.