agate
aquamarine
blue
blue vug
cerulian
chalcedony
crystal
crystalline
druzy chalcedony
facet
fluoresence
gem
gem stones
gemstone
geology
gossan
hemimorphite
industrial
infrared
iron cap
jewel
lead
mine
mineral
mining
natural
nature
ore
quartz
rock
sample
science
semiprecious
smithsonite
sorosilicate
specimen
sphalerite
stone
ultraviolet
vug
zinc
zinc carbonate
zine sulfate