Is biotite metallic or nonmetallic?
Biotite: Non-metallic (black) Slightly harder than glass: Olivine: Non-metallic (green) Slightly harder than glass: What metal is hematite? Physical Properties of Hematite; Chemical Classification Oxide; Chemical Composition: Fe2O3: Crystal System: Trigonal: Uses: The most important ore of iron. Pigment, heavy media separation, radiation ...
What are some uses for biotite?
Some Other Uses Of Biotite Concentrate:
- Sanitizer – sanitizes and softens your hands. Sanitizes surfaces too.
- Fruit and Vegetable Wash
- Detoxifying Foot Bath
- Add to spas, jacuzzis & whirlpools
- Add to fish tanks, bath water & swimming pools.
- Gardening
- Camping
- First aid kits
What is biotite used for?
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.
What are physical properties distinguish biotite from Muscovite?
- it is primary mineral that common in granite
- found in large crstals with a pseudohexagonal outline
- In metamorphic rocks
- it is form during regional metamorphism of argillaceous rocks.
- occur as isolated grains in gneiss and schist.
- In sedimentary rocks
- it is not resistant to chemical weathering
What is the mineral class for biotite mica?
BiotiteFormula (repeating unit)K(Mg,Fe) 3(AlSi 3O 10)(F,OH) 2IMA symbolBtCrystal systemMonoclinicCrystal classPrismatic (2/m) (same H-M symbol)25 more rows
What family is biotite in?
Biotite is a name used for a large group of black mica minerals that are commonly found in igneous and metamorphic rocks....Physical Properties of BiotiteChemical ClassificationDark micaChemical CompositionK(Mg,Fe)3(AlSi3O10)(F,OH)2Crystal SystemMonoclinic9 more rows
What minerals are in the mica group?
Mica, any of a collection of hydrous potassium, aluminum silicate minerals. It is a kind of phyllosilicate, showing a -dimensional sheet or layer structure.
Is biotite a feldspar mineral?
Biotite is a member of the mica branch of the silicate mineral group. It is common as a rock-forming mineral and is found associated with muscovite, feldspar, and quartz. It has a widespread occurance and is present in all three rock types igneous, metamorphic, and sedimentary. It is classified as a Phyllosilicate.
What mineral group is calcite in?
carbonatesCalcite is the principal mineral of the rock group known as carbonates.
Which of the following minerals is a silicate?
The vast majority of the minerals that make up the rocks of Earth's crust are silicate minerals. These include minerals such as quartz, feldspar, mica, amphibole, pyroxene, olivine, and a great variety of clay minerals.
Is mica a primary mineral?
Micas: Micas occur both as primary minerals in igneous rocks and as secondary minerals in altered products of feldspars and other minerals. The two important types are muscovite (white mica) a potassium aluminium silicate and biotite (black mica) a potassium, aluminium, magnesium, iron silicate.
Is mica a metamorphic mineral?
Mica is a metamorphic mineral. The many variations come from the diverse ways it formed. Mica formations are associated with volcanoes and hydrothermal vents. The most easily recognizable characteristic are the thin crystal layers.
Is mica a metallic mineral?
Mica is a non metallic mineral.
Is biotite and amphibole?
To be more specific, felsic rocks typically have biotite and/or amphibole; intermediate rocks have amphibole and, in some cases, pyroxene; and mafic rocks have pyroxene and, in some cases, olivine.
What is the description of biotite?
Definition of biotite : a generally black or dark green form of mica that is a constituent of crystalline rocks and consists of a silicate of iron, magnesium, potassium, and aluminum.
Is biotite a mafic mineral?
Mafic minerals are usually dark in color and have relatively high specific gravities (greater than 3.0). Common rock-forming mafic minerals include olivine, pyroxene, amphibole, biotite mica, and the plagioclase feldspars.
What type of rock is biotite gneiss?
This rock is mostly composed of creamy-white feldspar and quartz, together with dark minerals, of which the most abundant is the dark mica biotite. The dark minerals are arranged in a streaky banding, giving the rock a gneissic texture.
Is amphibole a mineral?
amphibole, any of a group of common rock-forming silicate minerals.
Is muscovite a silicate?
muscovite, also called common mica, potash mica, or isinglass, abundant silicate mineral that contains potassium and aluminum. Muscovite is the most common member of the mica group. Because of its perfect cleavage, it can occur in thin, transparent, but durable sheets.
What is the description of biotite?
Definition of biotite : a generally black or dark green form of mica that is a constituent of crystalline rocks and consists of a silicate of iron, magnesium, potassium, and aluminum.
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 ...
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 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.
What color is biotite?
In thin section, biotite exhibits moderate relief and a pale to deep greenish brown or brown color, with moderate to strong pleochroism. Biotite has a high birefringence which can be partially masked by its deep intrinsic color. Under cross-polarized light, biotite exhibits extinction approximately parallel to cleavage lines, and can have characteristic bird's eye maple extinction, a mottled appearance caused by the distortion of the mineral's flexible lamellae during grinding of the thin section. Basal sections of biotite in thin section are typically approximately hexagonal in shape and usually appear isotropic under cross-polarized light.
Where does biotite occur?
For instance, biotite occurs in the lava of Mount Vesuvius and in the Monzoni intrusive complex of the western Dolomites. Biotite in granite tends to be poorer in magnesium than the biotite found in its volcanic equivalent, rhyolite. Biotite is an essential phenocryst in some varieties of lamprophyre.
What is the name of the rock that is composed of mica?
An igneous rock composed almost entirely of dark mica (biotite or phlogopite) is known as a glimmerite or biotitite. Biotite may be found in association with its common alteration product chlorite. The largest documented single crystals of biotite were approximately 7 m 2 (75 sq ft) sheets found in Iveland, Norway.
What is biotite mica?
The term biotite is still used to describe unanalysed dark micas in the field. Biotite was named by J.F.L. Hausmann in 1847 in honor of the French physicist Jean-Baptiste Biot, who performed early research into the many optical properties of mica. Members of the biotite group are sheet silicates.
Why is biotite used in rock dating?
Because argon escapes readily from the biotite crystal structure at high temperatures, these methods may provide only minimum ages for many rocks. Biotite is also useful in assessing temperature histories of metamorphic rocks, because the partitioning of iron and magnesium between biotite and garnet is sensitive to temperature.
Why are biotite crystals called books?
When biotite crystals are found in large chunks, they are called "books" because they resemble books with pages of many sheets. The color of biotite is usually black and the mineral has a hardness of 2.5–3 on the Mohs scale of mineral hardness .
Is biotite a hexagonal or isotropic?
Basal sections of biotite in thin section are typically approximately hexagonal in shape and usually appear isotropic under cross-polarized light. Biotite (in brown) and muscovite in an orthogneiss thin section under plane-polarized light. Biotite in thin section under cross-polarized light.
What is biotite in rocks?
It has different roles in these rocks, though. It acts as the primary iron-bearing phase in many granitic rocks and as a hydrated potassium-bearing mineral in mafic rocks. Biotite is present in both silica under- and oversaturated rocks. Biotite, because it is the host of relatively uncommon chemical elements in a given magma, is a very common ingredient of pegmatites which crystallize from late-magmatic fluids. Large “books” are a common sight in pegmatitic rocks. Biotite in felsic rocks tends to be Fe-rich.
Where does biotite occur?
Biotite also occurs in skarns which are contact-metasomatized rocks which form when silicate magma reacts with carbonate rocks. Biotite in clastic sediments is a common mineral when biotite-bearing rocks are exposed nearby.
What is the most common mica?
Biotite (on the left) and muscovite are the most widespread micas. Most biotite group minerals are black in color, although the color gets lighter (brownish) if the sheet is thin enough for the light to penetrate it. Mg-rich phlogopite is brown or greenish. The density is highly variable: 2.7-3.3 g/cm 3.
What are the end members of the biotite group?
End-members such as phlogopite, annite and siderophyllite all belong to the group. It is a common practice to distinguish between biotite and phlogopite like these two are mutually exclusive minerals with different compositions. This is no longer true.
What type of rocks have books?
Large “books” are a common sight in pegmatitic rocks. Biotite in felsic rocks tends to be Fe-rich. Phlogopite in igneous rocks occurs in ultramafic rocks, especially diamond-bearing kimberlites. It is least common in mafic rocks, but these too host it sometimes.
Why is biotite abundant in intrusive rocks but usually resorbed in volcanic rocks?
The reason why biotite is abundant in intrusive but usually resorbed in volcanic rocks is that it is not a stable phase in magma at lower pressures. In metamorphic rocks too, biotite is present in a wide variety of rocks which formed under various temperature and pressure conditions.
How does biotite form?
Biotite in the majority of cases forms when clay-rich sedimentary rocks are buried deep enough for the clay minerals to metamorphose to it. Biotite also forms in impure metamorphosed carbonate rocks and in metabasic rocks.
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 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, ...
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 rocks have schists?
Schists are important in metamorphic rocks including gneisses, filites and horns. It is also found in immature sedimentary rocks, but changes the clay minerals when worn. The biotite in the granite tends to be weaker than the biotite present in the riolite in the volcanic equivalent of magnesium.
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 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.
What is the color of biotite?
Iron is the key element in biotite, giving it a dark or black appearance, while most forms of mica are pale in color. This gives rise to the common names of biotite, which are "dark mica" and "black mica.". Black mica and "white mica" (muscovite) often occur together within a rock and may even be found side-by-side.
What is biotite mica?
Key Takeaways. Biotite is a dark-colored mica. It is an aluminosilicate mineral that forms sheets or flakes. Although biotite is sometimes called black mica, it occurs in other colors, including brown, greenish-brown, yellow, and even white. Biotite occurs with other types of mica, even within a single rock.
How is biotite used to determine the age of rock?
Biotite is used to determine the age of rock through the process of argon -argon dating or potassium-argon dating. Biotite can be used to determine the minimum age of rock and profile its temperature history.
Where is aluminosilicate found?
It is found in the lava from Mount Vesuvius, the Monzoni intrusive complex of the Dolomites, and in granite, pegmatite, and schist.
Is mica a birefringent?
Mica is birefringent, making it useful to make wave plates. Because the mineral flakes into ultra-flat sheets, it can be used as an imaging substrate in atomic force microscopy. Large sheets may also be used for decorative purposes. All forms of mica, including biotite, may be ground and mixed.
Who discovered mica?
Humans have known about and used mica since prehistoric times. In 1847, German mineralogist J.F.L. Hausmann named the mineral biotite in honor of French physicist Jean-Baptiste Biot, who explored the optical properties of mica.
Is biotite black or white?
Biotite isn't always black. It can be dark brown or brownish-green. Lighter colors also occur, including yellow and white. Like other types of mica, biotite is a dielectric insulator. It is lightweight, reflective, refractive, flexible, and elastic. Biotite may be either translucent or opaque.
Biotite Image
Comments: Brown book of pseudohexagonal biotite crystals in matrix. Location: Sattleberg, Laacher See, Rhineland-Palatinate, Germany. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Calculated Properties of Biotite
Bulk Density (Electron Density)=3.07 gm/cc note: Specific Gravity of Biotite =3.10 gm/cc.
Other Biotite Information
See Also: Links to other databases for Biotite : 1 - Alkali-Nuts (English) 2 - Alkali-Nuts (Francais) 3 - Am. Min.
Composition
Biotite is a common group of phyllosilicate minerals within the mica group, with the approximate chemical formula K(Mg,Fe) 3AlSi 3O 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 was regarded as a mineral species by the International Miner…
Properties and Identification
Occurrence
Etymology
Uses
References
- The most characteristic property of these minerals is the perfect basal cleavage: Mica minerals have perfect basal cleavage which makes it easy to separate them into many thin folia. Biotite (on the left) and muscovite are the most widespread micas. Most biotite group minerals are black in color, although the color gets lighter (brownish) if the sh...