Muscovite Mica: Types, Occurrence, and Exploration
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.
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
Al
2
(Al Si
3
O
10
)(OH)
2
and
Phlogopite :
K Mg
3
(Al Si
3
O
10
)(OH)
2
Muscovite
Mica
It is
a
hydrous potassium
aluminium silicate
with
a
predominance of potassium.
It
ranges from colourless
through
browns
to
greens or
reds.
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.
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.
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
Muscovite
Mica
may
be
divided
into
two
color groups
:
RUBY MUSCOVITE
GREEN
MUSCOVITE
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.
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.
Physical
Properties
Lustre
-Vitreous,
Silky,
Pearly
Diaphaneity
(Transparency):
Transparen
t,
Translucent
Cleavage
:
Pe
r
f
e
ct
Perfect on
{001}.
Fracture:
Micaceous
Crystal System:
Monoclinic
with
a =
5.199Å,
b =
9.027Å,
c =
20.106Å
β
=
95.78
°
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.
THANK
YOU
Muscovite mica, a mineral with versatile industrial applications, is explored in detail through its types, occurrence in nature, and methods of exploitation. Muscovite, along with Phlogopite, forms the main classes of commercially significant micas, primarily used in various industries worldwide. With color variations and specific characteristics, muscovite mica deposits are mainly found in states like Jharkhand, Rajasthan, and Andhra Pradesh, where systematic mining operations are successfully conducted.
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Presentation Transcript
MUSCOVITE MICA Dr. A.V.Tejankar Professor & Head Dept. of Geology Deogiri College, Aurangabad
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.
Types Of Mica Of the nine common varieties in the mica group of minerals, the two principal classes of Mica types of commercial importanceare Muscovite : K Al2 (Al Si3 O10 )(OH) 2and Phlogopite : K Mg3 (Al Si3 O10 )(OH)2
Muscovite Mica It is a hydrous potassium aluminium silicate with a predominance of potassium. It ranges from colourless through browns to greens or reds.
PhlogopiteMica It is a hydrous magnesium aluminium silicate with a predominance of magnesium. It iscommonly called as Amber Mica which varies in colour from light silver to dark brown or amber.
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.
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
Muscovite Mica may be divided into two color groups : RUBY MUSCOVITE GREEN MUSCOVITE
RubyMuscovite 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.
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.
Physical Properties Lustre -Vitreous, Silky, Pearly Diaphaneity (Transparency):Transparen t, Translucent
Cleavage:Perfect Perfect on {001}. Fracture:Micaceous Crystal System: Monoclinic with a = 5.199 , b = 9.027 , c = 20.106 =95.78
DISTINGUISHING SIMILAR MINERALS Chloriteand 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.
