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Building Materials

Q1:

Pegmatite is a/an

A intrusive igneous rock

B extrusive igneous rock

C sedimentary rock

D metamorphic rock.

ANS:A - intrusive igneous rock

A pegmatite is an igneous rock, formed underground, with interlocking crystals usually larger than 2.5 cm in size (1 in). Most pegmatites are found in sheets of rock (dikes and veins) near large masses of igneous rocks called batholiths. It is Plutonic Rock (Intrusive Rock), found deep inside earth crust.



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