Stones
Sources of Stones
Types of minerals forming Sedimentary Rocks:
1. Calcite
This types of minerals are responsible for both igneous and sedimentary rocks but mainly it's chief formation of sedimentary rocks. It is a carbonate of calcium (CaCo3) produce carbon dioxide when come into the contact of acids. Calcite is a colorless mineral but due to impurities present in it sometimes available in brown, red and yellow color.
Calcite soluble in water. Hardness as per Moh's scale is 3.00. When it comes into the water containing carbon dioxide it forms calcium bicarbonate Ca(HCO3)2 which is hundred times more soluble in water than calcite.
Calcite is most the most stable mineral.
Average density : 2.7 g/cc
2. Magnesite
It is a rarely occurring mineral. It is harder than calcite and less soluble in water. Magnesite chemically written as MgCO3. Magnesite can be identified by it's trigonal structural view. Same as calcite it is a colorless mineral but due to presence of certain impurities it is available in pale-yellow, faintly-pink and pale-brown colors also. Hardness as per Moh's scale is 3.5 - 4.5.
Average density : 3 g/cc
3. Dolomite
Dolomite is available in many shades. It is having crystalline structure and brittle in nature. More harder than calcite and magnesite. It is hardly soluble in water. Dolomite is a bicarbonate of calcium and magnesium(MgCO3*CaCO3). It is sometimes known as dolostone. It is available in white, gray-pink, reddish-white and brown-white colors. Hardness as per Moh's scale is 3.5 - 4.
Average density is : 2.84 g/cc
4. Glauconite
Glauconite has no definite crystalline structure. It is available in yellow to green color. It can not be dissolve in any type of acid and ordinary water. Hardness as per Moh's scale is 2. Green sand composed of glauconite. It is rich in calcareous and siliceous matters.
Average density ranges from 2.40 g/cc to 2.95 g/cc
5. Limonite
Limonite is a mineral ranges it's color from yellow to reddish with earthy appearance. It is dissolve in acids only. Ratio of oxides to hydroxide vary at greater amount frequently. Limonite has a dense structure with hardness as per Moh's scale is 4 - 5.5.
Average density ranges from 2.7 g/cc to 4.3 g/cc
6. Gypsum
Gypsum is a soft mineral composed of calcium hydrate(CaSO4*2H2O). Gypsum is colorless in it's pure form, but due to certain impurities it is also present in different colors like black, reddish, gray and yellow. It is a crystalline substance having hardness as per Moh's scale 2. Gypsum is poorly soluble in water.
Average density is 2.96 g/cc
7. Anhydrate
It is a variety of gypsum. Chemical form of anhydrate is CaSO4. It is converted into gypsum after a long time contact period with water. Hardness as per Moh's scale varies from 3.00 to 3.50.
Average density is 2.97 g/cc
Kudos!! Simply great works.. keep it up !
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