Muscovite mica

22
MUSCOVITE MICA BY- ASHISH RANJAN, 12411008

description

Muscovite Mica in details...

Transcript of Muscovite mica

Page 1: Muscovite mica

MUSCOVITE MICA

BY- ASHISH RANJAN, 12411008

Page 2: Muscovite mica

What is Mica?

Mica is a generic term applied to a group of rock-forming complex

aluminosilicate minerals having a sheet or plate like structure with varying

chemical composition and physical properties.

Page 3: Muscovite mica

Types Of Mica

Of the nine common varieties in the mica group of minerals, the two principal

classes of Mica types of commercial importance are

Muscovite : K Al2 (Al Si3 O10 )(OH) 2 and

Phlogopite : K Mg3 (Al Si3 O10 )(OH) 2

Page 4: Muscovite mica

Muscovite Mica

It is a hydrous potassium aluminium silicate with a predominance of

potassium. It ranges from colourless through browns to greens or reds.

Page 5: Muscovite mica

Phlogopite Mica

It is a hydrous magnesium aluminium silicate with a predominance of

magnesium. It is commonly called as “Amber Mica” which varies in colour

from light silver to dark brown or amber.

Page 6: Muscovite mica

Occurence

Muscovite is the most common mica, found in Granites,

Pegmatites, Gneisses, and Schists, and as a contact

metamorphic rock or as a secondary mineral resulting

from the alteration of Topaz, Feldspar, Kyanite, etc.

In Pegmatites, it is often found in immense sheets that

are commercially valuable.

Page 7: Muscovite mica

Exploration and exploitation is successfully carried

by means of systematic vertical shaft and open cast

mining. The principal muscovite mica deposits are

chiefly found in the States of Jharkhand, Rajasthan

and Andhra Pradesh.

Jharkhand (formerly Bihar State) which produces the

world's finest muscovite mica well known throughout

the globe

Page 8: Muscovite mica
Page 9: Muscovite mica
Page 10: Muscovite mica

Muscovite

Mica may be

divided into two

color groups :

RUBY MUSCOVITE

GREEN MUSCOVITE

Page 11: Muscovite mica

Ruby Muscovite

Colour ranges from an almost white

through pink to a light ruby and

into shades of brownish ruby and

brown. It is produced in the Indian

States of Jharkhand and Rajasthan.

Page 12: Muscovite mica

Green Muscovite

Ranges from light to pale green through yellowish

and olive green to a dark green. It is produced

in the Indian State of Andhra Pradesh.

Page 13: Muscovite mica

Physical Properties

Lustre -Vitreous, Silky, Pearly

Diaphaneity (Transparency):Transparent,

Translucent

Page 14: Muscovite mica

Colour:White to colorless, silvery-white, and tinged various colors by

impurities.

Streak:White

Hardness (Mohs): 2½

Page 15: Muscovite mica

Cleavage:Perfect

Perfect on {001}.

Fracture:Micaceous

Crystal System: Monoclinic with a = 5.199Å, b = 9.027Å, c = 20.106Å

β = 95.78°

Page 16: Muscovite mica

DISTINGUISHING SIMILAR MINERALS

Chlorite and Margarite - Not as elastic as Muscovite.

Biotite, Phlogopite - Usually darker in color, otherwise very difficult to

distinguish.

Lepidolite - Very difficult to distinguish from pink Muscovite.

Gypsum - Cannot be peeled into micaceous sheets, crystals usually

differently shaped.

Page 17: Muscovite mica

Uses

Page 18: Muscovite mica
Page 19: Muscovite mica
Page 20: Muscovite mica
Page 21: Muscovite mica

THANK YOU

Page 22: Muscovite mica

Muscovite is an extremely common mineral, some bright yellow and others with perfect star formations, come from the famous pegmatite localites in the Doce and Jequitinhonha Valleys in Minas Gerais Brazil. Specific localities include Divino das Laranjeiras ("stars"),Galileia, Governador Valadares, Conselheiro Pena, Jaguaracu, Aracuai, and Coronel Murta. Beautiful yellow Muscovite comes from the Davib Ost Farm, Karibib, Erongo, Namibia. Fine Muscovite plates, often associated with valuable pegmatitegemstones, come from the Shigar Valley and Skardu District in Northern Pakistan. Nellore, India, is famous for its Muscovite mines which have produced some of the worlds largest mica sheets. Xuebaoding Mountain, Pingwu, in Sichuan Province, China, provides excellent Aquamarine and Scheelite that are associated with beautiful Muscovite plates.

In the U.S., Muscovite is fairly common in the pegmatites of San Diego county, including Pala and Ramona. Rare Muscovitepseudomorphs after Tourmaline come from the Willow Spring Ranch, Oracle, Pinal Co., Arizona. A bright pink, lithium-rich variety comes from the Harding Mine, Taos Co., New Mexico; and gemmy green crystals from Lincoln Co., North Carolina. Other important localties include Mt Antero, Chaffee Co., Colorado; the Diamond Mica Mine, Keystone, Pennington Co., South Dakota; Shelby, Cleveland Co., North Carolina; and Bedford, Westchester Co., New York.

New England contains some important Muscovite in its famous pegmatites, specifically at Middlesex Co., Connecticut (East Hampton, Haddam, and Portland); Grafton Co., New Hampshire (the Palermo No. 1 Mine, Groton; and the Ruggles Mine, Grafton); Mt. Apatite, Auburn, Androscoggin Co., Maine; and Greenwood and Newry, Oxford Co., Maine.