| Which among the following types of mica is/are found in India? |
| 1. Biotite |
| 2. Phlogopite |
| 3. Muscovite |
A) 1 only
B) 1 and 2 only
C) 2 and 3 only
D) 1, 2 and 3
Correct Answer: D
Solution :
Biotite is a common phyllosilicate mineral within the mica group. More generally, it refers to the dark mica series, primarily a solid-solution series between the iron endmember annite, and the magnesium endmember phlogopite. Phlogopite is a yellow, greenish, or reddish-brown member of the mica family of phyllosilicates. It is also known as magnesium mica. Muscovite (also known as common mica, isinglass, or potash mica) is a phyllosilicate mineral of aluminium and potassium. It has a highly perfect basal cleavage yielding remarkably thin laminc (sheets) which are often highly elastic. 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.
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