The formation of
granite
£¨One£©Granite.
Granite is igneous, emitted by
underground magma intrusion and cooling crystallization, and the granitic and
metamorphic rocks formed.
Visibility is the crystal structure and
texture.
It consists of feldspar (usually
K-feldspar and Austrian feldspar) and composed of quartz, mica Adulteration a
small number of (black mica or muscovite) and trace minerals,
for example: zircon, apatite,
Magnetite, ilmenite and drilling stone, and so on.
Granite main ingredient is
silica, its content is about 65% -85%.
The chemical nature of granite was weak
acid.
Under normal circumstances, white or gray granite slightly, mixed with dark
crystal, with the appearance of spots, the addition of K-feldspar makes its red
or ginger.
Granite from the crystallization of magma cooling slowly, buried in the ground,
very slow cooling rate, it would create a very rough texture of granite, known
as crystalline granite.
Granite and other crystalline rocks form
the basis of continental plates, it is also exposed to the surface of the Earth
the most common intrusive rocks.
Although granite is
considered material by melting or magma formation of igneous rocks, but there
were some substantial evidence that the formation of granite or local
deformation of the rock previously, they had not been liquid or rearrange the
melting process and recrystallization.
Granite from 2.63 to 2.75 in the proportion between the compressive strength of
1,050 to 14,000 kg / cm 2 (15,000 to 20, 000 pounds / square inch).
Because of the strength of
granite than sandstone, limestone and marble, and therefore more difficult to
mining.
The granite formation of the special
conditions and strong structural features, it has the following unique features:
(1)A good decorative properties, applicable in public places
and indoor decoration. China
Granite can be made of countertop, tombstone, blind stone, Sculpture, roadside
stone, ect. Granite products.
(2)With excellent
processing properties: sawing, cutting, grinding, drilling, such as carving. Its
processing accuracy of 0.5 ¦Ì m luminosity of more than 1,600.
(3)Wear resistance,
5-10 times higher than iron
(4)Coefficient of
thermal expansion of small and difficult to deformation, and indium similar to
steel, the temperature effect is minimal.
(5)The modulus of
elasticity than iron
(6)Rigid, the
damping, than the steel 15 times. Can earthquakes, damping.
(7)Granite is
brittle, damaged after only partial loss will not affect the overall flatness
of.
(8)Granite nature of
the chemical stability, not morals to acid, alkali and gas corrosion erosion,
chemical and silica content in direct proportion to life up to 200 years.
(9)Granite is not
conductive, magnetic, field of stability.
Usually, granite is
divided into three different categories:
Fine-grained granite:
feldspar crystals average diameter of 1 / 16 to 1 / 8 inch.
The granite tablets:
feldspar crystals average diameter of about 1 / 4 inch.
Coarse-grained
granite: feldspar crystals average diameter of about 1 / 2 inch diameter and
larger crystals, and some have even reached a few centimeters. Coarse-grained
granite density is relatively low.
In recent years, the
monument building used by the Stones, 83% of granite, marble and 17%.
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