aggregate
black
calcium
cluster
crystal
crystalline
ferberite
filament
gaslight
gem
gemstone
geological
geology
incandescent
lightbulb
luster
manganese
manufacturing
matrix
metal
metallic
mine
mineral
mineralogy
minerology
ore
pegmatite
rock
sample
scheelite
science
semiprecious
silicate
silver
specimen
tungstate
tungsten
tunstate
wolfram
wolframite