Friday, August 9, 2013

General characteristics of marble, Kota stone, granite, basalt etc

You can/may find here the following stone's characteristics discussed below:
(1) Marble (2) Limestone (3) Sandstone (4) Granite (5) Basalt (6) Slate  (7) Kota Stone

(1) Marble: 

A view of Taj Mahal(built with Marble)from the bank of the Yamuna river.
(a)Marble is a metamorphic rock formed    after after the metamorphism of the limestone. Under high temperature and pressure, re-crystallization of  calcite and dolomite takes place to a compact structure.
(b) It is largely used for the ornamental, carvings and molding works.
(c) It is available in many color from white to black including, red, green, yellow, blue and gray.
(d) It is porous to some degree and more after getting the polish.
(e) It has lustrous and glossy appearance.
(f) It is used as flooring, wall linings, table roofs, bath tubs, and sculpture making etc.
(g) Limestone(CaCO3) being the main compound it is liable to acid attacks, if MgCO3 is the major constituent then it is more acid resistant.
(h) Its specific gravity is 2.72
(i) Its crushing strength varies from 50 to 60 MN/m2

(2) Limestone:

(a)Limestone is a sedimentary and calcareous variety of rock. With CaCO3 it may contain MgCO3, and if both are present in equal proportion then it is known as dolomite.
(b) Generally it has  a stratified structure.
(c) It is available in few colors.
(d) It is used in the blast furnaces of many manufacturing industries like cement and bricks.
(e) It is used to get the pure lime.
(f) It is not suitable for use near industrial areas for building construction due to its chemically reactive property.
(g) Its specific gravity is 2.6.
(h) Its crushing strength is 52 MN/m2.

(3) Sandstone: 

(a) It is a type of rock which has the quartz or the sand bound together with the cementing minerals like mica, feldspar etc.
(b) It is a sedimentary rock
(c) Its color depends upon that of the feldspar.
(d) It can be used as a road metal if the higher quality stones like basalt and granite is not available.
(e) It is fire resistant.
(f) Its specific gravity is 2.25
(g) Its crushing strength varies 35 to 40 MN/m2.

(4) Granite: 

(a)It is a igneous rock of the plutonic variety.
(b)It contains the feldspar in abundance.
(c)It has a coarse grained crystalline structure.
(d)It is very hard, tough, durable and has a high specific gravity,
(e) It is used as a road metal, fine grained granite can be used for the masonry work.
(f) It has less fire resistance, so it cracks at high temperatures.
(g) It is best suited for industrial towns.
(h) The life of granite is over 300 years.
(i) Its specific gravity is  2.64.
(j) Its crushing strength varies 110 to 140 MN/m2.

(5) Basalt:

(a)It is a kind of igneous rock of the volcanic variety
(b) It possess a very fine grained and almost non crystalline structure.
(c) It is tougher and has more specific gravity than the granite.
(d) It is non water absorbent.
(e) Crushed basalt is highly used as road metal.
(f) Its specif gravity is 2.96.
(g) Its crushing varies from 70 to 80 MN/m2

(6) Slate:  

(a)Slate is a metamorphic rock obtained after the metamorphism of the shale which is a sedimentary             rock of the argillaceous variety.
(b) It is a foliated rock and can be split  into thin sheets.
(c)  It is available in grey or dark blue color.
(d)  It is widely used as the roofing material in the hilly areas, cisterns and urinal separations.
(e) It is non water absorbent and smooth surfaced.
(f) Its specific gravity is 2.8.
(g) Its crushing strength varies from 60 to 70 MN/m2.

(7) Kota Stone:

(a) Kota stone is a kind of the limestone which is available in the Kota district of the Rajasthan.
 (b) It has fine grained structure, so it can be polished and is famous as the flooring, wall lining, paving material.

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