Characteristics of stones

In order to ensure suitable selection of stone of particular work, one must be conversant with its composition, characteristics, uses and place of availability.
Granite
  • Igneous rock
  • Composed of quart, feldspar and mica and minerals
  • Available in grey, green, brown and pink and red
  • Hard and durable
  • High resistance to weathering
  • The texture varies with its quality
  • Specify gravity 2.7 and compressive strength 700 to 1300 kg/cm2
  • Used for ornamental, road metal, railway ballast, aggregate for concrete; for construction of bridges, piers and marine works etc.
Balast
  • Igneous rock
  • It is compact, hard and heavy
  • 3.Available in red, yellow grey, blue and greenish black colour
  • Specific gravity is 3 and compressive strength varies 1530 to 1890 kg/cm2.
  • Used for ornamental, rail road ballast, aggregates for concrete etc.
Sand Stone:
  • Sedimentary rock
  • It is available in variety of formations fine grained, coarse grained compact or porous
  • Available in white, green, blue, black, red and yellow.
  • Specific gravity 2.65 to 2.95
  • Compressive strength is 650kgs / cm2
  • Used for ashlars works
Lime Stone:
  • Sedimentary rock: It is available in a variety of forms which differ from one another in colour Compaction, texture, hardness and durable
  • Compact lime stone
  • Granular lime stone
  • Magnesia lime stone
  • Kanker lime stone
  • Used for paving, road metal, etc
Marble
  • Metamorphic rock
  • Available in white, blue, green, yellow black and red colour
  • High compactness,
  • Suitable for decorative works, wall lining columns, pile, table slabs, hearths, tiled floors, steps of stair case etc.
Slate:
  • Metamorphic rock
  • Non absorbent, compact fine grained and produce metallic ringing sound when struck
  • Available in black, dark blue, grey, reddish brown etc.
  • Used for providing damp proof course, paving dados etc