Allochromatic minerals may show more than two colours.

Which of the following minerals can scratch Topaz?

Identify the type of structure shown below.

Hardness is a relative property.

The streak given by the quartz group is ______________

What is the structure or form of dolomite?

In the atomic structure, each oxygen atom is shared by how many tetrahedra?

How many sets of cleavage is shown by calcite minerals usually?