There are two types of consumption of granite in market: aggregate and block stone. The
usage areas of aggregate are in road making, gravels to use in concrete grout, ballast
on railroads. The usage areas of block stones are for making landmark, monument and
gravestone, columns and stepped stones in building, curbstone and flag for roads. The
distinct features of granite are not needed in processing of block stones. Also the industry of
block stones is easier than the other. Structural features of graywackes are so important in
granites for processing of block stones.
The most important features are hardiness (resistance to disruption, refraction and chemical
action), severity (resistance to erosion) and stability (resistance to freezing and resolution).
Despite the fact that hardiness and severity improve the quality, the working cost is affected
negatively. Also, the quarry of the aggregate should be near to consumption area, because
one of the most important fabrication input of the aggregate is transport.
Block Stone Features
The color of granite is controlled according to feldspar and quartz. Generally its color is
pinky grey or dark red. According to quotient of biotite and hornblende its color changes into
light grey or dark grey. In that rate, the lower feldspar quotient the lower red color tone. It
is the common feature that iridescent color of the black granite (anorthosite) according to
labradorite quotient. It takes advantage that color change of the granite is less during the
production in the quarry.
During the production in the quarry and during the operation of cutting, refinement, glazing
and honing the high hardness of the granite minerals increase in the cost.
MANUFACTURING METHODS OF GRANITE
Manufacturing methods are different according to the area of quarry. If the existence
area of granite is hill footstep should be formed from sideward. If topography is lowland,
manufacturing being carried out go down deep. This depth does not exceed of 100m.