What do you mean by Rock Forming Minerals?write down properties and uses of some common rock forming minerals.
Those minerals which are found in majority of rocks in significant proportion are called rock forming minerals.
Civil Engineering Significance of Rock-Forming Minerals:
The civil engineers need to know the properties of the rocks precisely to enable them to consider different rocks for any required purpose, i.e, as foundation rocks, as road metal, as concrete aggregate, as building stones, as flooring or roofing material, as decorative material etc.All properties of rocks are , in turn, dependent on the properties of their constituent minerals.Thus, properties of civil engineering importance such as strength, durability, and appearance of rocks can be assessed only with the knowledge of the minerals that form rocks i.e, rock-forming minerals.
The economic minerals,since they are scare, do not influence the properties of rocks and hence irrelevant from the civil engineering point of view.However,if they happen to occur in large q....
Show More
Those minerals which are found in majority of rocks in significant proportion are called rock forming minerals.
Civil Engineering Significance of Rock-Forming Minerals:
The civil engineers need to know the properties of the rocks precisely to enable them to consider different rocks for any required purpose, i.e, as foundation rocks, as road metal, as concrete aggregate, as building stones, as flooring or roofing material, as decorative material etc.All properties of rocks are , in turn, dependent on the properties of their constituent minerals.Thus, properties of civil engineering importance such as strength, durability, and appearance of rocks can be assessed only with the knowledge of the minerals that form rocks i.e, rock-forming minerals.
The economic minerals,since they are scare, do not influence the properties of rocks and hence irrelevant from the civil engineering point of view.However,if they happen to occur in large quantities,their economic value will not permit them to be used as construction materials or as foundation sites.
MINERALS
| CRYSTAL-FORM
| COLOR
| HARDNESS
| STREAK
| TENACITY
| USES
|
Quartz
| Hexagonal
| colourless
| 7
| colourless
| Brittle
| - it is sometimes employed to jjewelry and for making spectacle glasses and electrical materials.
|
Orthoclase Feldspar
| Monoclinic
| Red
| 6
| Colourless
| Brittle
| - It is used in the manufacture of porcelain glass, sanitary wares and enameled brick.
|
plagioclase
| Triclinic
| Grey
| 6
| White
| Brittle
| - it is used in the manufacture of porcelain.
|
Fluorite
| Isometric
| white,yellow,green rose
| 4
| White
| Brittle
| - It is used as a flux in the making of steel in the manufacture of opalescent glass, in the enameling of cooking utensils,for the preparation of hydrofluoric acid and sometimes as an ornamental material.
|
Calcite
| Hexagonal
| Colourless or white
| 3
| White
| Brittle
| - It is used in the manufacture of mortars and cement, as a building and ornamental materials.
- It is used as a fertilizer in white wash.
|
gypsum
| Monoclinic
| White
| 2
| White
| Sectile
| - It is used as a retarder in cement as a fertilizer, as a filler in various materials such as paper crayons paint,rubber etc and used in the manufacture of plaster of paris.
|
Biotite
| Monoclinic
| Black
| 2.5 - 3
| Colorless
| Elastic
| - Mica minerals are extensively used for insulating purposes.
|
Muscovite
| Monoclinic
| Colorless
| 2.0 - 2.5
| Colorless
| Elastic
| - Insulating purposes,Glass industry.
|
Kyanite
| Triclinic
| Light Blue
| 4 - 7 depending upon faces.
| White
| Brittle
| - Used in the manufacture of Porcelein glass.
|
Hornblende
| Monoclinic
| Greenish black
| 5 - 6
| Green
| Brittle
| - It is used for decorative purposes.
|
Tourmaline
| Hexagonal-Trigonal
| Dark Black
| 7 - 7.5
| Colorless
| Brittle
| - The variously colored and transparent varieties are used as gem stones.
|
Olivine
| Orthorhombic
| Grayish green
| 6 - 7
| Colorless
| Brittle
| - They provide a high grade material for refractory forsterite bricks,Transparent,beautifully colored crystals of olivine untouched by metamorphism (chrysolites) are used as gemstones
|
Guest