Biotite - Wikipedia
WEBBiotite is a common group of phyllosilicate minerals within the mica group, with the approximate chemical formula K (Mg,Fe)3AlSi3O10(F,OH)2. It is primarily a solid-solution series between the iron - endmember annite, and the magnesium -endmember phlogopite; more aluminous end-members include siderophyllite and eastonite.
Biotite Mineral | Uses and Properties - Geology.com
WEBBiotite is a rock-forming mineral found in a wide range of crystalline igneous rocks such as granite, diorite, gabbro, peridotite, and pegmatite. It also forms under metamorphic conditions when argillaceous rocks are exposed to …
Biotite mica: The mineral Biotite information and pictures
WEBBiotite is a common rock-forming mineral, and is especially noted in metamorphic rock s such as schist and gneiss. It is also found in igneous rock such as granite s and rhyolites. Biotite is also the primary mica in rare earth pegmatite …
Biotite | Common Minerals
WEBA common, widespread, rock-forming mineral, biotite is a significant mineral in granites, diorites, and igneous pegmatites. In pegmatites, biotite crystals can be very large. It also occurs in schists, gneisses, and hornfels that resulted …
Biotite Mica : Properties, Formation, Ocurrence and Uses
WEBSep 2, 2023 · Biotite is the most common mica mineral and also known as black mica, a silicate mineral in the common mica group. Approximate chemical formula K (Mg, Fe). It can be found in massive crystal layers weighing several hundred pounds.
Biotite | Mica, Silicate, Rock-Forming | Britannica
WEBbiotite, a silicate mineral in the common mica group. It is abundant in metamorphic rocks (both regional and contact), in pegmatites, and also in granites and other intrusive igneous rocks. For chemical formula and detailed physical properties, see mica (table).
Biotite - Rock-Forming Minerals - Sandatlas
WEBBiotite is a very common and widespread mineral group. The minerals of the group occur often in metamorphic and igneous rocks. It is much less common in sediments and sedimentary rocks because it yields to clay minerals in the weathering environment. Biotite is one of the two most common members of the mica group. The other one is muscovite.
Biotite - Clark Science Center
WEBBiotite, usually dark green, brown, or black, has a pale brown color under plane-polarized light in this sample. It exhibits high interference colors in cross-polar light just as muscovite, but has a lower birefringence than muscovite.
Biotite Group – WGNHS – UW–Madison
WEBDescription: Biotite refers to a group of common rock-forming minerals forming a series between phlogopite and annite. The name is best used as a field name for dark micas for which the exact composition has not been determined. It …
Biotite - Minerals Education Coalition
WEBBiotite is black magnesium/iron-based mica of low commercial value. It appears in the form of thin sheets which generally range from 0.003 mm to 0.1 mm in thickness. Uses. The high iron content, which imparts dark colors, rules out biotite from many industrial uses.
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