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Quartz
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Quartz
Chemical
Formula: SiO2
CAS
number: 7631-86-9
Quartz is the most
abundant and most
common mineral on
the Earth. It is found
in almost every geological
environment and also
it is at least a component
of almost every rock
type.
Pure quartz is colorless
or white; colored
varieties include
rose quartz, amethyst,
smoky quartz, milky
quartz, and others.
Quartz goes by an
array of different
names. The most important
distinction between
types of quartz is
that of macrocrystalline
(individual crystals
visible to the unaided
eye) and the microcrystalline
or cryptocrystalline
varieties (aggregates
of crystals visible
only under high magnification).
Chalcedony is a generic
term for cryptocrystalline
quartz. The cryptocrystalline
varieties are either
translucent or mostly
opaque, while the
transparent varieties
tend to be macrocrystalline.
Although many of the
varietal names historically
arose from the color
of the mineral, current
scientific naming
schemes refer primarily
to the microstructure
of the mineral. Color
is a secondary identifier
for the cryptocrystalline
minerals, although
it is a primary identifier
for the macrocrystalline
varieties. This does
not always hold true.
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Physical
Properties |
Property |
Description
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Color |
Clear (in pure form)
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Crystal habit |
6-sided prism ending in
6-sided pyramid (typical) |
Crystal
system |
Trigonal |
Cleavage |
None |
Fracture |
Conchoidal |
Mohs
scale hardness |
7 -
lower in impure varieties |
Luster |
Vitreous |
Refractive
index |
1.544-1.553
- Dr +0.009 (B-G interval) |
Streak |
White |
Specific
gravity |
2.65
constant; variable in impure
varieties |
Melting
point |
1650
(±75) 0C |
Boiling
point |
2230
0C |
Solubility |
H 2O
insoluble |
Using
in Glass industry, pain
industry, ceramic industry,
coating . |
Chemical
Properties |
Analyte |
SSW |
Semi |
General |
SiO2 |
99.80% (±
00.20%) |
98.30% (±
00.20%) |
96.50% (±
00.30%) |
Al2O3 |
00.03% (±
00.05%) |
00.50% (±
00.10%) |
00.80% (±
00.10%) |
Fe2O3 |
00.05% (max) |
00.085% (max) |
00.20% (max) |
K2O |
25 ppm (max) |
00.001% (max) |
00.20% (±
00.05%) |
Na2O |
40 ppm (max) |
00.001% (max) |
00.09% (max) |
TiO2 |
Nil |
Traces |
Traces |
LoI @ 10000 C |
00.05% |
00.10% |
00.10% |
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