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Building Materials - Engineering

Q1:

The rocks in which argil (or clay) predominates, are called

A sillicious rocks

B argillaceous rocks

C calcareous rocks

D igneous rocks.

ANS:B - argillaceous rocks

Siliceous, argillaceous, calcareous are all Sedimentary Rock.

Siliceous rocks are sedimentary rocks that have silica (SiO2) as the principal constituent.

Argillaceous components are fine-grained (less than 2 µm) CLAY minerals such as kaolinite.

Calcareous is partly composed of calcium carbonate, in other words, containing lime or being chalky.