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Q: Identify the silicious rock based on chemical classification of Rocks.
  • A. Gneiss
  • B. Marble
  • C. Laterite
  • D. Dolomite
Correct Answer: Option A - Based on chemical characteristics– Siliceous– The principal constituent is silica i.e. sand. The rocks are very hard and durable e.g. granite, basalt, trap, quartzite, gneiss, syenite etc. Caclarious– The principal constituent is lime. e.g. limestone, marble, dolomite, etc. Argillaceous– The principal constituent is clay. The rocks are hard and brittle, e.g. slate, laterite etc.
A. Based on chemical characteristics– Siliceous– The principal constituent is silica i.e. sand. The rocks are very hard and durable e.g. granite, basalt, trap, quartzite, gneiss, syenite etc. Caclarious– The principal constituent is lime. e.g. limestone, marble, dolomite, etc. Argillaceous– The principal constituent is clay. The rocks are hard and brittle, e.g. slate, laterite etc.

Explanations:

Based on chemical characteristics– Siliceous– The principal constituent is silica i.e. sand. The rocks are very hard and durable e.g. granite, basalt, trap, quartzite, gneiss, syenite etc. Caclarious– The principal constituent is lime. e.g. limestone, marble, dolomite, etc. Argillaceous– The principal constituent is clay. The rocks are hard and brittle, e.g. slate, laterite etc.