biotite

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  • noun

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dark brown to black mica found in igneous and metamorphic rock

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Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Water/cement ratio 0.38, density 2 440 kg x [m.sup.-3] * washed aggregate mined from water; compostion; quartz grains with an Admixture of feldspars, micas and rock debris; ** graodiorites with an admixture (ca 20%) of granitized biotitic Gneisses (Martinec et al.
Use of pulsating water jet technology for removal of concrete in repair of concrete structures/ Pulsuojancios vandens sroves technologijos naudojimas betonui pasalinti remontuojant betoninius statinius/ Pulsejosas augstspiediena udens struklas tehnologijas izmantosana betona slana nokalsanai remontejamam betona konstrukcijam/ Pulseeriva veejoa tehnoloogia kasutamine betooni eemaldamiseks betoonkonstruktsioonide remondil
hirsuta is not a cave in the true sense, but comprises an outcrop of granitic and biotitic feldsparic gneiss that split vertically, forming a narrow rock fissure that transects the outcrop from north to south and from top to bottom (Fig.
Further details of the morphology of the enigmatic African fly Mormotomyia hirsuta Austen (Diptera: Mormotomyiidae)
Sporadically, but especially in the eastern part of the lens and near the lower margin, dark brown biotitic mica is abundant.
Podlesnoite Ba[Ca.sub.2](C[O.sub.3])[.sub.2][F.sub.2]: a new mineral species from the Kirovskii mine Khibiny, Kola Peninsula, Russia
Micaceous, mostly biotitic enclaves are occasionally found, as well as schlieren structures.
Zircon U-Pb and Hf isotopic constraints on the genesis of a post-kinematic S-type Variscan tin granite: the Logrosan cupola (Central Iberian Zone)
The rocks commonly also contain a second generation green amphibole, some in distinctly elongated prisms, associated with chlorite, epidote, and biotitic mica.
Petrography and major element chemistry of mafic dykes in the Nagar Parkar Igneous Complex, Tharparkar, Sindh
The Strazek Moldanubicum is formed primarily by cordierite-biotitic gneiss and migmatites, with biotitic and frequently migmatized gneiss and with the intercalated beds of amphibolites, erlan gneiss and magnesian limestone.
Structural analysis within the Rozna and Olsi uranium deposits (Strazek Moldanubicum) for the estimation of deformation and stress conditions of underground gas storage
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