Biotite

biotite

What is biotite?

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.

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.

What is the difference between biotite and mica?

Biotite is also sometimes called black mica as opposed to white mica ( muscovite) – both form in the same rocks, and in some instances side by side. Like other mica minerals, biotite has a highly perfect basal cleavage, and consists of flexible sheets, or lamellae, which easily flake off.

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.

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.

Why is biotite rarely found in collections?

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.

What is the difference between biotite and muscovite?

The fundamental difference between biotite and muscovite is what they’re made of. Muscovite contains aluminum and potassium. Biotite contains magnesium and potassium. Because of their color differences, they’re called different names and have other characteristics as well:

What is biotite made of?

Biotite is a low silicate mineral made of potassium and magnesium. It’s a silicate sheet and is also called iron mica. This is because most specimens are rich in iron and belong to the dark mica series. Its color is typically dark brown to yellow because of its magnesium-rich properties.

What is the color streak of biotite?

The mineral streak of biotite is white. Moreover, its optical properties can vary from transparent to translucent to opaque. The mineral is also useful in determining the age of rocks and in assessing the temperature history of metamorphic rocks. What are the Similarities Between Muscovite and Biotite?

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