Biotite 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 heat and pressure to form schist and gneiss.

Biotite 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 is now a group name for phlogopite, siderophyllite and eastonite. Common world wide. Link to MinDat.org Location Data. Named in 1847 after the French physicist, Jean Baptiste Biot (1774 - 1862), who studied the optical properties of the micas. Comments: Brown book of pseudohexagonal biotite crystals in matrix.

A 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 from either regional or contact metamorphism.

Sep 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.

Jan 16, 2020 · Biotite is found in igneous and metamorphic rocks. It forms over a range of temperatures and pressures when the aluminosilicate crystallizes. It is an abundant mineral, calculated to account for about 7 percent of the continental crust.

Biotite is a common rock-forming mineral, and is especially noted in metamorphic rocks 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 s.

Biotite, 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 is a type of mica that is commonly found in igneous and metamorphic rocks. It is known for its dark color and ability to easily split into thin, flexible sheets. In this article, we will explore the various properties and meanings of biotite, as well as its uses and interesting facts.

Biotite, also known, as ‘black mica’ is a rock-forming femic phyllosilicate that occurs in several igneous and metamorphic rocks. The mineral was named in honor of the French scientist Jean-Baptiste Biot, who devoted his life to study the optical properties of …