Biotite is a name used for a large group of black mica
Biotite
Biotite is a common phyllosilicate mineral within the mica group, with the approximate chemical formula K(Mg,Fe)₃AlSi₃O₁₂. More generally, it refers to the dark mica series, primarily a solid-solution series between the iron-endmember annite, and the magnesium-endmember phlogopite; more al…
What is biotite mica?
Biotite is a very common form of mica. It is named in honor Jean Baptiste Biot (1774 - 1862), a French physicist, mathematician, and astronomer who researched the mica minerals for their optical properties. Because of Biotite's abundance, its presence is usually lacking in collections except for it being an accessory mineral to other minerals.
Where is biotite found?
Biotite is a group of black mica minerals found in igneous and metamorphic rocks. Article by: Hobart M. King, PhD, RPG Biotite: Biotite from Bancroft, Ontario, Canada. Specimen is approximately 4 inches (10 centimeters) across.
Is biotite a metamorphic rock?
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.
What does biotite look like?
It is a black mica with perfect cleavage and a vitreous luster on the cleavage faces. When biotite is separated into thin sheets, the sheets are flexible but will break upon severe bending. When held up to the light, the sheets are transparent to translucent with a brown, gray, or greenish color.
Where can biotite mica be found?
Biotite mica Biotite mica can be easily identified by its dark brown to black colour that is a result of the high ferro-magnesium content of the mineral. It is a common rock forming mineral that is found in granite, syenite and other igneous rocks. It is also found in metamorphic rocks such as gneisses and schists.
What is biotite found in?
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. Biotite was named in honor of the French physicist Jean Baptiste Biot.
Where does biotite mica come from?
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 granites and rhyolites. Biotite is also the primary mica in rare earth pegmatites.
How common is biotite mica?
about 7 percentIt is an abundant mineral, calculated to account for about 7 percent of the continental crust. It is found in the lava from Mount Vesuvius, the Monzoni intrusive complex of the Dolomites, and in granite, pegmatite, and schist. Biotite is so common that it's considered a rock-forming mineral.
How much is biotite mica worth?
Black Mica Biotite at Rs 300/kilogram(s) | Argaghat | Giridih| ID: 9891952630.
Is biotite rare or common?
Biotite 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.
Is biotite valuable?
Biotite is rarely considered a valuable mineral specimen, but it can accompany other minerals and compliment them.
Is gold found in biotite?
The gold, which occurs as native gold, is associated with biotite breakdown and carbonate alteration reactions.
Is biotite toxic?
Biotite mica is enriched with essential nutrients (such as Fe, Mg, K, Si, Zn and Mo) which help in body functions. Biotitie also contains toxic trace elements Ni, Cu, Cr, Se, Pb etc. [10, 11]. However, both essental and toxic cations are limitedly available when the mineral is in unaltered form.
What color is biotite mica?
Color - generally pleochroic, typically in shades of brown, but also can be yellow, green or red. Common biotite is one of the most strongly colored minerals seen in thin section. For biotite with low Fe-content (phlogopite), coloration is more subtle (clear, light browns and tans).
What is biotite used for?
Uses. Biotite is used extensively to constrain ages of rocks, by either potassium-argon dating or argon–argon dating. Because argon escapes readily from the biotite crystal structure at high temperatures, these methods may provide only minimum ages for many rocks.
Is biotite valuable?
Biotite is rarely considered a valuable mineral specimen, but it can accompany other minerals and compliment them.
Is gold found in biotite?
The gold, which occurs as native gold, is associated with biotite breakdown and carbonate alteration reactions.
Is biotite toxic?
Biotite mica is enriched with essential nutrients (such as Fe, Mg, K, Si, Zn and Mo) which help in body functions. Biotitie also contains toxic trace elements Ni, Cu, Cr, Se, Pb etc. [10, 11]. However, both essental and toxic cations are limitedly available when the mineral is in unaltered form.
What are the features of biotite?
Striking Features. Flaky habit, crystals, sectility, and mode of occurence. Environment. Biotite 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.
How much does biotite weigh?
Biotite can come in enormous crystal sheets that can weigh several hundred pounds. Thin sheets can be peeled off as layers, and the thinner a layer is peeled the greater its transparency becomes. In 1998, the IMA removed the status of Biotite as an individual mineral species, and instead declared it as a group name for the following individual ...
Why is biotite called biotite?
Because of Biotite's abundance, its presence is usually lacking in collections except for it being an accessory mineral to other minerals. Biotite can come in enormous crystal sheets ...
Why is biotite hard to clean?
Biotite is very hard to clean because if washed it will absorb water internally and start to break apart.
Is biotite a conductor?
Biotite, like Muscovite, is a very poor conductor of heat and electricity, and is thus used as an insulator for various electrical products and semiconductors. Biotite is found in abundance worldwide, but collectors specimens are not common and come from few localities.
Where is biotite found?
Biotite is found in a wide variety of igneous and metamorphic rocks. For instance, biotite occurs in the lava of Mount Vesuvius and in the Monzoni intrusive complex of the western Dolomites. It is an essential phenocryst in some varieties of lamprophyre.
Why is biotite mica called iron mica?
Biotite mica is sometimes called "iron mica" because it is more iron-rich than phlogopite. It is also sometimes called "black mica" as opposed to "white mica" (muscovite) both form in some rocks, in some instances side-by-side. Biotite has radioactive elements in it that age used to figure out how old the mineral is.
Why is mica important?
The clearer our vision becomes the more unified we are as the veil of separation disintegrates. Mica enhances flexibility in all situations, helping us eliminate anger, tantrums and nervous energy. It helps release energy blocks within the body and align the chakras. Mica can be used for clarity in visions.
What is the purpose of mica?
Mica posseses great resistance to the passage of electricity and heat and is therefore used as an electronic insulator. Micas have their main industrial use in the field of electronics. It is used as an insulating material since is does not transfer heat or energy very well.
What is biotite in Bancroft?
In Bancroft, Ontario Biotite forms large crystals with green apatite and hornblende. Single large plates or "books" of biotite can grow to considerable size and can make impressive mineral specimens.
What is mica used for?
Scrap, ground mica can be used to make heat-insulating bricks, as a filler for rubbers, and sometimes in the plant and lubricant and plastic industries. It is also used in making roofing material, wallpaper, lamp shades, etc.
How does mica grow?
Mica grows by building up see-through paper-thin layers upon layers, which appear opaque but are in fact transparent . Mica is very metallic (containing very reactive element metals such as Potassium and Lithium, as well as Aluminium and Silica) and can be cold to touch.
Where is biotite found?
Biotite is found in a wide variety of magmatic and metamorphic rocks. It is common in various magmatic and metamorphic rocks. In igneous rocks, more commonly in silicic and alkaline rocks, e.g. granites, diorite s, gabbros and peridotites.
What is similar to biotite?
Similar Species: Glauconite, commonly found in green pellets in sedimentary deposits, is similar in composition to biotite.
Why is biotite used in metamorphic rocks?
Biotite is also useful for evaluating the temperature histories of metamorphic rocks, because the division of iron and magnesium between biotite and garnet is temperature sensitive.
What is biotite in shingers?
It is a fundamental component of many metamorphic shingers and form s in suitable compositions in a wide range of pressure and temperature. Biotite is estimated to be up to 7% of the exposed continental crust.
What is the chemical formula for biotite?
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. It is abundant in metamorphic rocks (both regional and contact), pegmatites, ...
What is biotite used for?
The modified biotite, produced by hydrothermal or abrasion processes, produces vermiculite, a porous material used as an insulating material in gypsum wall panels and other heat insulation applications.
Why is biotite used in soil?
Biotite is commonly used to limit the age of rocks through potassium-argon escort or argon-argon escort.
Where is biotite found?
In nature, biotite is found in the form of lamellar, scaly and columnar forms, occurs in igneous, metamorphic rocks and basalts, often found in pegmatite veins. Biotite can be formed due to chemical influences on hornblende and augites. Often biotite is located next to feldspars, grenades, muscovites and andalusites. Large amounts of biotite are mined in pegmatite deposits in Italy, Russia, Scandinavia, Brazil, Greenland and Alaska. Large crystals resembling flat sheets are being developed in the southern regions of Norway. Sometimes their size can reach several square meters. Beautiful stones are mined in Germany, Canada and Tanzania.
What is biotite used for?
The mineral has insulating properties that are resistant to high temperatures, so it is preferred to use it in radio engineering and electronics instead of modern synthetic analogues. Biotite is one of the components of vermiculite, which is gaining popularity in the construction industry for thermal insulation of buildings and the agricultural industry to increase the productivity of plantations as a microelemental fertilizer. Biotite is used in other areas. Wood products are faced with mica, and they look no less impressive than objects inlaid with mother of pearl. Crushed mica powder is added to paints to give them shine and shine. Enamel formulations enriched with biotite are used in the production of wallpaper and plastic to give them a decorative effect. In the cosmetic industry, finely divided biotite powder is added as powder, eye shadow and blush as nacre. In mineralogy, biotite is used to determine the conditions and age of rock formation. Unusual crystals are exhibited in collections. Jewelry craftsmen embed raw crystals or cabochon in their jewelry. Beautiful pendants, bracelets, earrings and rings are made from biotite.
What is the mineral in the decorator?
This unique decorator mineral specimen has a matrix of chatoyant blade-like sillimanite and black biotite with a small amount of quartz along with reddish-purple almandine garnets (also known as almandite garnet ).
What is the color of sillimanite?
This natural decorator mineral specimen of sillimanite-biotite-quartz matrix has reddish-purple almandine garnet (also known as almandite garnet ). The sillimanite is chatoyant with blade-like form.
