aggregate
apatite
chrome
chrome diopside
collection
crystal
crystalline
decorative
diopside
emerald
gem
gemology
gemstone
geological
geology
glass
glassy
gray
green
hydrothermal
little
mine
mineral
mineralogy
moravia
natural
nature
object
ore
pegmatite
phosphate
piece
raw
rock
sample
semiprecious
siberian
single
small
specimen
stone
translucent
transparent
treasure