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Directions (Qs. 41 to 44): Look at the following table and answer the following: The Importance of Rocks and Minerals  

Name	Type of Rock	Use
Basalt	Igneous	Used in road building
Calcite	Mineral	Used in cements and mortars.
Granite	Igneous	Used for building, monuments, and tombstones.
Marble	Metamorphic	Used In building, floors, tile in bathrooms.
Obsidian	Igneous	Used in making arrowheads and knives
Pumice	Igneous	Used in scouring, scrubbing, and polishing materials.
Quartz	Mineral	Used in making glass, electrical components, and optical lenses.
Sandstone	Sedimentary	Used in the building industry for house.
Slate	Metamorphic	Used for roofs, chalkboards.

 

Which one of the following is used for making optical lenses?

A) Marble                        

B) Diamond       

C) Granite                       

D) Quartz