Chemical Classification of stones
On the basis of their chemical composition engineers prefer
to classify rocks as:
•
Silicious rocks
•
Argillaceous rocks and
•
Calcareous rocks
(i)
Silicious rocks: The main content of
these rocks is silica. They are hard and durable. Examples of such rocks are
granite, trap, sand stones etc.
(ii)
Argillaceous rocks: The main
constituent of these rocks is argil i.e.,
clay. These stones are hard and durable but they are brittle. They cannot
withstand shock. Slates and laterites are examples of this type of rocks.
(iii)
Calcareous rocks: The main
constituent of these rocks is calcium carbonate. Limestone is a calcareous rock
of sedimentary origin while marble is a calcareous rock of metamorphic origin.
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