Biotite Mica Rock - 20g Bag of Mineral Specimens

Biotite Mica Rock - 20g Bag of Mineral Specimens

Overview

A layered silicate sheet, biotite belongs to the mica group, and can be used to determine the minimum age of rocks.

Warnings

Biotite Mica Rock - 20g Bag of Mineral Specimens

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Overview

A layered silicate sheet, biotite belongs to the mica group, and can be used to determine the minimum age of rocks.

Warnings

Product Details

Biotite Mica Mineral - 20g Bag
by American Educational Products

Biotite, a phyllosilicate mineral that is within the mica group, is generally though of as the dark mica of the series. It is a sheet silicate, and is composed of iron, magnesium, aluminium, silicon, oxygen, and hydrogen. These all form into a series of sheets that are bonded to one another by means of potassium ions, though the bond is relatively week. It is sometimes referred to as iron mica, or black mica, due to its propensity to be iron-rich, and its black color.

Found in both igneous and metamorphic rocks, and occasionally cleavable crystals like pegmatite, the largest documented specimen is approximately 7m2, or 75 square feet. It sees extensive use in potassium-argon and argon-argon dating of rocks, though it is usually only for determining the minimum age of a rock, due to argon's ability to readily escape from biotite crystals at high temperatures.

Each bag of biotite contains on average 8-10 pieces. Depending on their size, there could be more, or less, than that..

Additional Information

SKU

AMEP5640

Weight

0.2 lb

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