Minerals are naturally occurring inorganic solid substances that have a definite and homogeneous chemical composition. While minerals are pure substances, impurities can sometimes cause the same mineral to vary in color, such as smoky quartz, white quartz, and rose quartz which are all variations of the mineral quartz.

2. naturally ocurring inorganic
solid substance homogeneous
definite chemical
composition
calcite

3. Are minerals
pure substances?
Can the same mineral vary in colour?
Yes, impurities can cause different colours.
smoky
quartz
white quartz
rose quartz
Yes, minerals are pure substances.