Biotite - Wikipedia
网页Biotite is a common group of phyllosilicate minerals within the mica group, with the approximate chemical formula K(Mg,Fe) 3 AlSi 3 O 10 (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
网页Biotite is a name used for a large group of black mica minerals that are commonly found in igneous and metamorphic rocks. These include annite, phlogopite, siderophyllite, fluorophlogopite, fluorannite, eastonite, and many others. These micas vary in chemical composition but are all sheet silicate minerals with very similar physical properties.
Biotite | Common Minerals
网页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 …
Biotite - New World Encyclopedia
网页Biotite is a sheet silicate with a hardness of 2.5-3 on the Mohs scale and a specific gravity of 2.7-3.1. It consists of flexible sheets, or lamellae, that easily flake off. The sheets are made of iron magnesium aluminum silicate and are weakly held together by potassium ions.
Biotite Mica : Properties, Formation, Ocurrence and Uses
网页2023年9月2日 · Biotite: Biotite has a more complex chemical composition compared to muscovite. Its general formula is K(Mg,Fe)_3AlSi_3O_10(OH)_2, which means it contains potassium (K), magnesium (Mg), iron (Fe), aluminum (Al), silicon (Si), and oxygen (O) atoms, along with hydroxide (OH) ions.
Biotite | Mica, Silicate, Rock-Forming | Britannica
网页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 Mineral Geology and Uses - ThoughtCo
网页2020年1月16日 · Biotite forms sheets of iron, silicon, magnesium, aluminum, and hydrogen weakly bonded by potassium ions. Stacks of sheets form what are called "books" because of their resemblance to pages. Iron is the key element in biotite, giving it a dark or black appearance, while most forms of mica are pale in color.
Biotite - Geology is the Way
网页Biotite is a common femic minerals in a wide range of rocks. In igneous rocks, it is typical of granitoids but it can be found also in pegmatites, granodiorites, tonalites, and diorites. Phlogopitic varieties may occur in feldspathoid-bearing rocks and kimberlites. In some cases, biotite has been reported also in mafic rocks like norites.
Biotite: Mineral information, data and localities. - mindat.org
网页Formula: K (Fe2+/Mg)2(Al/Fe3+/Mg/Ti) ( [Si/Al/Fe]2Si2O10) (OH/F)2 or Simplified: K (Mg,Fe)3AlSi3O10(OH)2. Simplified formula more commonly used is based on the more common species regarded as 'biotite' subgroup. A slash in the formula indicates different elements can occur in this position but without assumption on priority. Member of:
Geology - rocks and minerals - University of Auckland
网页Biotite. Biotite is a member of the mica group of silicates (sheet silicates), like chlorite and muscovite. It occurs in more geological environments than any of the other micas. It is a common rock forming mineral, being present in at least some percentage in many igneous rocks (e.g. granite and rhyolite), and metamorphic rocks (e.g. schist ...
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