Question

Characteristic of stone

Answer 1

Answer:

Based on Geology, stones or rocks are classified into three types: Igneous Rocks - Basalt, Trap, Andesite, Rhyolite, Diorite, Granite. Sedimentary Rocks - Lime stones, Dolomite and Sandstones. Metamorphic Rocks - Gneiss, Quartzite, Marble, Slate.

Answer 2

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Following are the characteristics of a stone

Texture:

A good building stone should have compact fine crystalline structure free from cavities, cracks or patches of soft or loose material. The stones with such texture are strong and durable.

Hardness:

The coefficient of hardness, as worked out in hardness level, should be greater than 17 for a stone to be used in road work. If it is between 14 and 17, the stone is said to be of medium hardness. If it is less than 14, the stone is said to be of poor hardness and such stone should not be used in rood work.

Appearance:

For face work it should have fine, compact texture; light coloured stone is preferred as dark colour are likely to fade out in due course of time.

Fracture:

For a good building stone, its fracture should be sharp, even bright and clean with grains well cemented together. A dull, chalky and earthly fracture of a stone indicates signs of early future decay.

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