It is a kind of mineral.
A rare mineral that can be cut and polished could be called a gemstone.
there are more than 40 types of rare tigers left
Coal is not a mineral and is not rare.
yes but a very rare mineral
yes but a very rare mineral
About 1in200,000
Yes.
Yes.
gem
Because tigers are rare and people aren't.
Gold is a rockforming mineral, not common but rare