Question

An unknown mineral specimen is not scratched by a penny and does not exhibit cleavage. The mineral is most likely to be

Answer 1

Answer:

Quartz is a resistant mineral whose hardness is 7, according to the Mohr's hardness scale. It is made up of silicon and oxygen and very abundant on the earth's continental crust, after feldspar. It is a very hard mineral that crystallizes in the hexagonal system.