muscovite mica hardness

Phengite: Phengite is an aluminous true mica which contains a relatively high amount of tetrahedrally co-ordinated Si (>3.1 apfu). Fuchsite, Lepidolite, and Muscovite are three members of the Mica family. Persbergite: Muscovite pseudomorphous after nepheline. A green to colorless, Ba-bearing variety of muscovite intermediate in chemical composition between true mica and brittle mica. Phlogopite mica remains stable at higher temperatures (to 900 °C (1,650 °F)) and is used in applications in which a combination of … Muscovite is a potassium-rich mica with the following generalized composition… KAl 2 (AlSi 3 O 10)(OH) 2. Trying to definitely distinguish whether a light brown mica sample is muscovite or phlogopite may require chemical tests. Muscovite Chemical Composition. Silicate mineral with monoclinic crystal structure and pearly lustre. Muscovite Mica Specific gravity: 2.77-2.88 Muscovite Mica Index of refraction: 1.552-1.616 Muscovite Birefringence:.036-.049 Pleochroism: muscovite is colorless Muscovite Mica Hardness: 2.5-4, hardness is greater perpendicular to the cleavage Color: colorless Muscovite Mica … Science & Origin of MuscoviteMuscovite, also known as Muscovy Glass, is an aluminum potassium mineral and the most common member of the Mica family. In this formula potassium is sometimes replaced by other ions with a single positive charge such as sodium, rubidium, or cesium. It crystallizes in the form of small hexagonal or tabular “crisps”, as well as elongated sheets and solid masses. Gypsum: Clear crystals of selenite gypsum may initially be mistaken for muscovite because of their transparency, light color, low hardness, and good single cleavage. Muscovite has a Mohs hardness of 2–2.25 and when comes to its crystal habit is crystals tabular to columnar, striated, pseudohexagonal or diamond-shaped, to 4.5 m and 77 t. The density of this stone is 2.77- 2.88 (g/cm3). Formula: KAl3Si3O10(OH)2 Hardness: 2.5-4 Description: Most common form of mica. Muscovite Meanings, Zodiacs, Planets, Elements, Colors, Chakras, and more. 2.5 - 3.0 Muscovite and biotite mica are 2.0-2.5 and 2.5-3.0 respectively on the Mohs scale. Muscovite, the principal mica used by the electrical industry, is used in capacitors that are ideal for high frequency and radio frequency. Specimen number: R22786

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