Hydrogrossular Garnet (Transvaal "Jade")
Hydrogrossular garnet is also called Transvaal Grossular Garnet
or Green "Jade". It is a rare, dense and opaque green grossular garnet
where hydroxide partially replaces silica. Mohs hardness 7. Although
jade has a reputation of being hard to polish, it polishes well with
diamond and takes a high polish with chrome oxide.
Example of a Hydrogrossular Garnet Cabochon.