Building Materials
Granite is not suitable for ordinary building purpose because

it can not be polished
it is costly
it is not a fire proof material
it has less crushing strength

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Building Materials
Asbestos

Is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3)
Is a natural fibrous mineral substance
Contains iron oxide and alumina
All of these

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Building Materials
A queen closer is a

Brick laid with its breadth parallel to the face or direction of wall
Brick laid with its length parallel to the face or direction of wall
Brick with half the width at one end and full width at the other
Brick having the same length and depth as the other bricks but half the breadth

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