A biotite specimen taken from Wikipedia, the free wikipedia Biotite is a common group of phyllosilicate minerals found in the mica group, with the approximate chemical formula K (Mg,Fe) 3AlSi 3O 10(F,OH) 2. It has the approximate chemical formula K (Mg,Fe) 3AlSi 3O 10(F,OH) 2.
What is the chemical composition of biotite?
For the biotite group, a generalized chemical composition is: K(Mg,Fe) 3 (AlSi 3 O 10) (see figure) (F,OH) 2. The term ‘biotite’ is commonly used in the field and in introductory geology classes since these minerals are difficult to differentiate without the use of optical, chemical, or x-ray examination, among other methods.
Why is the name biotite used in geology?
When describing these minerals in the field or in introductory geology classes, the term ‘biotite’ is often used since they are difficult to differentiate without the assistance of optical, chemical, or x-ray investigation.Natural-occurring biotite is a rock-forming mineral that may be found in many different types of crystalline igneous rocks.These include granite, diorite, gabbro, peridotite, and pegmatite, among others.
How thick is biotite specimen?
The specimen has a thickness of roughly 3/8 inch (.95 centimeter). As previously said, biotite is a term that refers to a group of black mica crystals that have varying chemical compositions but have extremely comparable physical attributes to one another. These minerals are often indistinguishable from one another without the use of scientific testing.
What is biotite mica?
Biotite is a kind of mica that is fairly prevalent.It was given this name in honor of Jean Baptiste Biot (1774 – 1862), a French scientist, mathematician, and astronomer who studied the optical characteristics of mica rocks during the nineteenth century.Because to biotite’s abundance, it is rarely seen in collections, with the exception of when it is used as an accessory mineral to other minerals.
What is the empirical formula for biotite?
Two bits of biotite have been discovered. Biotite is a common phyllosilicate mineral that is found in the mica group and is found in abundance. Its approximate chemical formula is K(Mg, Fe)3AlSi3O10(F, OH)2, which stands for potassium magnesium iron.
What elements is biotite made of?
Biotite is recognized as a combination made of varying amounts of four basic aluminosilicates of potassium, iron, magnesium, and aluminum: potassium aluminosilicate, iron aluminosilicate, magnesium aluminosilicate, and aluminum aluminosilicate Among the minerals found in the earth’s crust are annite (K3Fe6Al2O20)4; siderophyllite (K2Fe5Al3O20)4; phlogopite (K2Mg6Al2O20)4; and eastonite (K2Mg5A1(Si5Al3O20)4; and phlogopite (K2Mg6Al2O20)4;
What is the value of biotite?
Petrographic Data File is an abbreviation for Petrographic Data File.
|Physical Properties||H = 2.5 – 3 G = 2.7 – 3.3 The color of biotite in hand sample is brown to black (sometimes greenish). Its streak is white or gray, and it has a vitreous luster.|
|Color/Pleochroism||Typically brown, brownish green or reddish brown|
Where do you find biotite?
The mineral biotite may be found in a variety of rocks all around the world. Evje, Norway; Bessnes, France; the Uluguru highlands in Tanzania; Ontario, Canada; and Laacher See, Germany are among locations where significant deposits have been discovered.
How do muscovite and biotite differ chemically?
The primary distinction between muscovite and biotite is that muscovite includes mostly potassium and aluminum, whereas biotite contains primarily potassium and magnesium. Muscovite is a mineral composed primarily of potassium and aluminum. Muscovite and biotite are phyllosilicate minerals, which means they include silicate.
What is the chemical formula for muscovite?
|Formula (repeating unit)||KAl2(AlSi3O10)(F,OH)2|
What is the chemical formula for potassium feldspar?
Moonstone was supposed to be effective at alleviating insomnia. Feldspars are classified into two categories: K-feldspars are a kind of feldspar (potassium feldspars) Feldspar is the sixteenth element on the periodic table.
|Chemical composition||Potassium, sodium and calcium-aluminum silicates I. K-feldspar (KALSi308) II. Plagioclase feldspar (isomorphous)|
How biotite is formed?
The bulk of the time, biotite is formed when clay-rich sedimentary rocks are buried deep enough for the clay minerals to metamorphosis into it, which occurs in the majority of situations. Biotite may also be found in impure metamorphosed carbonate rocks and metabasic rocks, as well as in metabasic rocks.
How is gypsum formed?
It is a naturally occurring mineral that may be found in certain types of sedimentary rocks, such as limestone. Gypsum is formed when water evaporates in mineral-rich marine soil conditions, resulting in the formation of calcium carbonate. Evaporation brings additional minerals to the soil surface over a lengthy period of time, eventually resulting in the formation of a solid deposit.
What is a biotite schist?
For example, a quartz-feldspar-biotite schist is a schist with an unknown protolith that includes biotite mica, feldspar, and quartz in descending order of apparent abundance. Lineated schist is a type of rock that has a strong linear fabric inside a rock that otherwise has a lot of schistosity.
What is the chemical composition of fluorite?
Fluorite is composed of calcium fluoride (CaF2) and other elements. Ca represents 51.1 percent of the total, while F represents 48.9 percent. Diagnostic Characteristics The presence of cubic crystals and octahedral cleavage, as well as vitreous luster and generally fine coloring, as well as the fact that it can be scraped with a knife, are all characteristics that distinguish it.