A Biotite slice

Biotite is a common phyllosilicate mineral that contains potassium, magnesium, iron and aluminium. It is sometimes called "iron mica" and is found in granitic rocks, gneisses, and schists. Like other mica minerals, biotite has a highly perfect basal cleavage, its flexible sheets easily flaking off. It has a hardness of 2.5 - 3, a specific gravity of 2.7 - 3.1, is colored greenish to brown or black, and can be transparent to opaque. Biotite is occasionally found in large sheets, especially in pegmatite veins, and also occurs as a contact metamorphic rock or the product of the alteration of hornblende, augite, wernerite, and similar minerals. Biotite slice (potassium, iron, magnesium, aluminum, and silicate hydroxide) [1] File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Biotite slice (potassium, iron, magnesium, aluminum, and silicate hydroxide) [1] File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... The silicate minerals make up the the largest and most important class of rock-forming minerals. ... This article is about minerals in the geologic sense; for nutrient minerals see dietary mineral; for the band see Mineral (band). ... General Name, Symbol, Number potassium, K, 19 Chemical series alkali metals Group, Period, Block 1, 4, s Appearance silvery white Atomic mass 39. ... General Name, Symbol, Number magnesium, Mg, 12 Chemical series alkaline earth metals Group, Period, Block 2, 3, s Appearance silvery white Atomic mass 24. ... General Name, Symbol, Number iron, Fe, 26 Chemical series transition metals Group, Period, Block 8, 4, d Appearance lustrous metallic with a grayish tinge Atomic mass 55. ... General Name, Symbol, Number aluminium, Al, 13 Chemical series poor metals Group, Period, Block 13, 3, p Appearance silvery Atomic mass 26. ... Quarrying granite for the Mormon Temple, Utah Territory. ... Banded gneiss with dike of granite orthogneiss Gneiss is a common and widely distributed type of rock formed by high grade regional metamorphic processes from preexisting formations that were originally either igneous or sedimentary rocks. ... Categories: Mineral stubs | Metamorphic rocks ... rock with mica Mica sheet mica flakes The mica group of minerals includes several closely related materials having highly perfect basal cleavage. ... Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer. ... Relative density (also known as specific gravity) is a measure of the density of a material. ... Look up green in Wiktionary, the free dictionary. ... The color brown is produced by mixing complementary colors, such as red and green, orange and blue, or yellow and purple. ... Black is a color with several subtle differences in meaning. ... Pegmatite is a very coarse-grained igneous rock that has a grain size of 20 mm or more; such rocks are referred to as pegmatitic. ... Metamorphic rock is the result of the transformation of a pre-existing rock type, the protolith, in a process called metamorphism, which means change in form (from the Greek words meta, change, and morphe, form). The protolith is subjected to extreme heat (greater than 150 degrees Celsius) and pressure causing... Amphibole (Hornblende) Hornblende is a complex inosilicate series of minerals. ... Augite is a mafic mineral described chemically as (Ca, Na)(Mg, Fe, Al)(Al, Si)2O6 or calcium sodium magnesium iron aluminium silicate. ... Scapolite (Gr. ...

Biotite occurs in the lava of Mount Vesuvius, at Monzoni, and many other European locations. In the United States, it is found in the pegmatites of New England, Virginia and North Carolina, as well as in the granite of Pikes Peak, Colorado. Look up lava, Aa, and pahoehoe in Wiktionary, the free dictionary. ... This article is about the volcano in Italy. ... World map showing Europe Europe is conventionally considered one of the seven continents which, in this case, is more a cultural and political distinction than a physiogeographic one. ... First Flag of New England, 1686-c. ... Official language(s) English Capital Richmond Largest city Virginia Beach Area  - Total  - Width  - Length  - % water  - Latitude  - Longitude Ranked 35th 110,862 km² 320 km 690 km 7. ... State nickname: Tar Heel State; Old North State Official languages English Capital Raleigh Largest city Charlotte Governor Michael Easley (D) Senators Elizabeth Dole (R) Richard Burr (R) Area  - Total  - % water Ranked 28th 139,509 km² 9. ... Pikes Peak (formerly Pikes Peak, see below) is a mountain in the Front Range of the Rocky Mountains, near Colorado Springs, Colorado. ... Official language(s) English Capital Denver Largest city Denver Area  - Total  - Width  - Length  - % water  - Latitude  - Longitude Ranked 8th 269,837 km² 451 km 612 km 0. ...

Biotite was named in honor of the French physicist Jean-Baptiste Biot. A physicist is a scientist trained in physics. ... Categories: People stubs | 1774 births | 1862 deaths | French physicists | French mathematicians | Members of the Acad mie fran aise ...

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