Muscovite Mica and Phlogopite

Nickel-Strunz 10th Ed.

Mica Group, Muscovite Series. Fluorapatite photos of Muscovite associated with Fluorapatite on mindat. It can form during regional metamorphism of argillaceous rocks.

In pegmatites, it is often found in immense sheets that are commercially valuable. Maine Sagadahoc Co. Mineral Classification: Creation of synthetic micas are created in laboratories to use as substitutes, such as polyester, nylon and fiberglass.

No matter how dark muscovite gets, fresh biotite is distinctly darker.

Barium-Vanadium-Muscovite A barian vanadian variety of Muscovite. This variety is known as sericite, and is usually the product of alteration of feldspar. Cell Parameters: We welcome suggested improvements to any of our articles. Mica is also used as an extender and filler in the plastics industry.

Geology - rocks and minerals

Muscovite is chiefly characteristic of the deep-seated igneous rocks, and is not found in the recent eruptive rocks. Ground mica is used in the well-drilling industry as an element in drilling fluids.

Rare Crystals and Gemstone Rough, all types. Several polytypes are known see below ; the most common one is the 2M 1 polytype. Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets. Crystal Data. Article History. Told from phlogopite by its not being decomposed in sulphuric acid and from lepidolite by not giving a crimson flame positive test for lithium. Study of Knurr and Bail Select feedback type: Alternative Titles: Vitreous to Pearly or Silky Refractive Index: This section is currently hidden.

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American Mineralogist: Your email address will not be published. Description The mica group is a large group with nearly 30 members recognized, but only a few are common. Connecticut Fairfield Co. The sheet mica comprises thin cleavage plates cut into shapes. Muscovite has been mined in New Hampshire, Maine and Connecticut. The following are some of the more common mica minerals: Clays and Clay Minerals: External Link.