Biotite

biotite

What is a biotite?

Biotite is a very common and widespread mineral group. The minerals of the group occur often in metamorphic and igneous rocks.

Did Biot discover the mineral biotite?

There are some claims that Biot discovered the mineral biotite. It can hardly be true. Biotite is a very common natural material which I am sure was well-known for our Stone Age ancestors.

How thick is biotite specimen?

Specimen is approximately 3/8 inch (.95 centimeter) thick. As noted above, biotite is a name used for a number of black mica minerals that have different chemical compositions but very similar physical properties. These minerals generally cannot be distinguished from one another without laboratory analysis.

Is biotite hard to clean?

However, mineral collectors still refer to Biotite by its traditional name and rarely make a distinction among its members except for Phlogopite. Biotite is very hard to clean because if washed it will absorb water internally and start to break apart. The best way to wash Biotite and other Micas is with a dry electric toothbrush.

What is a biotite mineral?

Biotite Minerals. As noted above, biotite is a name used for a number of black mica minerals that have different chemical compositions but very similar physical properties. These minerals generally cannot be distinguished from one another without laboratory analysis.

What is Biotite usually altered to?

Biotite is usually altered to clay minerals montmorillonite and vermiculite. Biotite and muscovite are the two most common mica minerals that often occur together in Al-rich igneous rock.

Is biotite the same as mica?

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. The primary use of biotite is to date the minimum age of rocks and geological features.

Is biotite a solid solution series?

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 Mineralogical Association until 1998, when its status was changed to a mineral group.

What is the size of biotite?

Biotite: Biotite from Bancroft, Ontario, Canada. Specimen is approximately 4 inches (10 centimeters) across. What is Biotite? Biotite is a name used for a large group of black mica minerals that are commonly found in igneous and metamorphic rocks.

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 Biotites abundance, its presence is usually lacking in collections except for it being an accessory mineral to other minerals.

Why is biotite rarely found in collections?

Because of Biotites 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 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.

Is biotite a solid solution series?

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 Mineralogical Association until 1998, when its status was changed to a mineral group.

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