mineral
adamantine spar
alumina
aluminium oxide
aluminum oxide
oriental amethyst
oriental ruby
ruby
sapphire
aberdonian
bauxite
beryl
bone dust
carnelian
chrysoberyl
chrysoprase
cinnabar
club moss
cufflink
heavy-gauge
horse-chestnut
jadeite
nephrite
peridot
protoplanetary
quarter-inch
semiprecious
she-devil
tourmaline
vitrim
zircon
Carborundum