BASALT AND TRAP
The shape is medium to high-quality grained and compact. Their shade varies from dark gray to black. Fractures and joints are common. Their weight varies from 18 kN/m3 to 29 kN/m3. The compressive strength varies from two hundred to 350 N/mm2. These are igneous rocks. They are used as avenue metals, aggregates for concrete. They are also used for rubble masonry works for bridge piers, river partitions and dams. They are used as pavement.
Granites are also igneous rocks. The shade varies from light grey to pink. The shape is crystalline, pleasant to coarse grained. They take polish well. They are difficult durable. Specific gravity is from 2.6 to 2.7 and compressive strength is 100 to 250 N/mm2. They are used frequently for bridge piers, river walls, and for dams. They are used as kerbs and pedestals. The use of granite for enormous and institutional buildings is common. Polished granites are used as desk tops, cladding for columns and wall. They are used as coarse aggregates in concrete.
These are sedimentary rocks, and hence stratified. They consist of quartz and feldspar. They are determined in diverse shades like white, gray, red, buff, brown, yellow and even dark gray. The precise gravity varies from 1.85 to 2.7 and compressive energy varies from 20 to a hundred and seventy N/mm2. Its porosity varies from 5 to 25 in line with cent. Weathering of rocks renders it flawed as building stone. It is perfect to apply sand stones with silica cement for heavy structures, if necessary. They are used for masonry work, for dams, bridge piers and river walls.
These are metamorphic rocks. They are composed of quartz, mica and clay minerals. The shape is pleasant grained. They break up along the planes of authentic bedding easily. The shade varies from dark gray, greenish gray, red gray to black. The unique gravity is 2.6 to 2.7. Compressive energy varies from one hundred to 200 N/mm2. They are used as roofing tiles, slabs, pavements etc.
It is a metamorphic rock. It is having porous and sponges shape. It contains high percent of iron oxide. Its shade can be brownish, red, yellow, brown and grey. Its unique gravity is 1.eighty five and compressive electricity varies from 1.9 to 2.3 N/mm2. It may be without difficulty quarried in blocks. With seasoning it gains strength. When used as building stone, its outer surface must be plastered.
This is a metamorphic rock. It can take suitable polish. It is available in special alluring colours like white and pink. Its unique gravity is 2.sixty five and compressive electricity is 70–seventy five N/mm2. It is used for dealing with and decorative works. It is used for columns, flooring, steps etc.
It is a metamorphic rock. It is having nice to coarse grains. Alternative darkish and white bands are common. Light gray, pink, purple, greenish gray and dark gray coloured types are to be had. These stones aren’t preferred due to deleterious constituents present in it. They can be used in minor constructions. However tough sorts may be used for buildings. The specific gravity varies from 2.five to three.zero and crushing power varies from 50 to two hundred N/mm2.
Quartzites are metamorphic rocks. The structure is fine to coarse grained and regularly granular and branded. They are available in specific shades like white, grey, yellowish. Quartz is the leader constituent with feldspar and mica in small quantities. The particular gravity varies from 2.55 to2.sixty five. Crushing electricity varies from 50 to three hundred N/mm2. They are used as building blocks and slabs. Theyare also used as aggregates for concrete.