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BASALT AND TRAP
The dwelling is medium to fine grained little. Their colour differs from dark grey to black. Fractures and joints are typical. How much they weigh differs from 18 kN/m3 to 29 kN/m3. The compressive strength differs from 200 to 350 N/mm2. They are igneous rocks. They are utilised as road metals, aggregates for concrete. They’re also employed for boulders masonry works best for bridge piers, river walls and dams. They are utilised as pavement.
GRANITE
Granites will also be igneous rocks. The color differs from light grey to pink. The dwelling is crystalline, fine to coarse grained. They take polish well. They’re hard durable. Specific gravity comes from 2.6 to two.7 and compressive strength is 100 to 250 N/mm2. They are utilised mainly for bridge piers, river walls, as well as for dams. They are utilised as kerbs and pedestals. Using granite for monumental and institutional structures is typical. Polished granites are utilized as table tops, cladding for posts and wall. They are utilised as coarse aggregates in concrete.
SAND STONE
They are sedimentary rocks, and therefore stratified. They contain quarta movement and feldspar. They’re present in various colours like white-colored, gray, red, buff, brown, yellow as well as dark grey. The particular gravity differs from 1.85 to two.7 and compressive strength differs from 20 to 170 N/mm2. Its porosity differs from 5 to 25 percent. Weathering of rocks renders it unacceptable as building stone. It’s desirable to make use of sand gemstones with silica cement for heavy structures, if required. They are utilised for masonry work, for dams, bridge piers and river walls.
SLATE
They are metamorphic rocks. They’re made up of quarta movement, mica and clay minerals. The dwelling is okay grained. They split across the planes of original bedding easily. The color differs from dark grey, green grey, crimson grey to black. The particular gravity is 2.6 to two.7. Compressive strength differs from 100 to 200 N/mm2. They are utilised as roofing tiles, slabs, pavements etc.
LATERITE
It’s a metamorphic rock. It’s getting porous and sponges structure. It has high number of iron oxide. Its colour might be brown, red, yellow, brown and gray. Its specific gravity is 1.85 and compressive strength differs from 1.9 to two.3 N/mm2. It may be easily quarried in blocks. With seasoning it gains strength. When utilized as building stone, its outer surface ought to be plastered.
MARBLE
This can be a metamorphic rock. It will take good polish. It will come in different pleasing colours like white-colored and pink. Its specific gravity is 2.65 and compressive strength is 70–75 N/mm2. It’s employed for facing and decorative works. It’s employed for posts, flooring, steps etc.
GNEISS
It’s a metamorphic rock. It’s getting fine to coarse grains. Alternative dark and white-colored bands are typical. Light gray, pink, crimson, green grey and dark gray coloured varieties can be found. These gemstones aren’t preferred due to unhealthy constituents contained in it. They might be utilized in minor constructions. However hard varieties can be utilized for structures. The particular gravity differs from 2.5 to three. and crushing strength differs from 50 to 200 N/mm2.
QUARTZITE
Quartzites are metamorphic rocks. The dwelling is okay to coarse grained and frequently granular and branded. These come in different colours like white-colored, grey, yellow-colored. Quarta movement may be the chief constituent with feldspar and mica in small quantities. The particular gravity differs from 2.55 to2.65. Crushing strength differs from 50 to 300 N/mm2. They are utilised as foundations and slabs. Theyare also utilized as aggregates for concrete.
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