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Dark brown to black mica found in igneous and metamorphic rock
Answer for the clue "Dark brown to black mica found in igneous and metamorphic rock ", 7 letters:
biotite
Alternative clues for the word biotite
Word definitions for biotite in dictionaries
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Mica \Mi"ca\, n. [L. mica crumb, grain, particle; cf. F. mica.] (Min.) The name of a group of minerals characterized by highly perfect cleavage, so that they readily separate into very thin leaves, more or less elastic. They differ widely in composition, ...
WordNet
Word definitions in WordNet
n. dark brown to black mica found in igneous and metamorphic rock
Wiktionary
Word definitions in Wiktionary
n. (context mineral English) A dark brown mica; it is a mixed aluminosilicate and fluoride of potassium, magnesium and iron.
Wikipedia
Word definitions in Wikipedia
Biotite is a common phyllosilicate mineral within the mica group, with the approximate chemical formula . More generally, it refers to the dark mica series, primarily a solid-solution series between the iron -endmember annite , and the magnesium -endmember ...
Usage examples of biotite.
Oswald Brunies, the strutting, candy-sucking teacher -- a monument will be erected to him -- to him with magnifying glass on elastic, with sticky bag in sticky coat pocket, to him who collected big stones and little stones, rare pebbles, preferably mica gneiss -- muscovy biotite -- quartz, feldspar, and hornblende, who picked up pebbles, examined them, rejected or kept them, to him the Big Playground of the Conradinum was not an abrasive stumbling block but a lasting invitation to scratch about with the tip of his shoe after nine rooster steps.
Noetic shreds, arkose shards, biotite fragments tumbling and grinding in a dry breccia slurry.
Oswald Brunies, the strutting, candy-sucking teacher -- a monument will be erected to him -- to him with magnifying glass on elastic, with sticky bag in sticky coat pocket, to him who collected big stones and little stones, rare pebbles, preferably mica gneiss -- muscovy biotite -- quartz, feldspar, and hornblende, who picked up pebbles, examined them, rejected or kept them, to him the Big Playground of the Conradinum was not an abrasive stumbling block but a lasting invitation to scratch about with the tip of his shoe after nine rooster steps.
I offered to make room in our cellar for mica gneiss and mica granite, for biotite and muscovite.
Unfortunately, the only minerals Maia could recognize were biotite, for its gray flecks, and dark, glossy hornblende.
Brunies, while a cough drop grows smaller, classifies the yield of a collector's day: the region is rich in biotite and muscovite: they rub together gneissly.