background
cement
close
collection
crystal
crystalline
galena
galenite
gemstone
geological
geology
glance
glitter
gloss
gray
industry
isolated
lead
luster
macro
material
matrix
metal
metallic
mine
mineral
mineralogy
natural
nature
object
ore
pebble
piece
raw
rock
rough
sample
shine
silver
slovakia
small
specimen
stone
structure
sulphide
surface
texture
up
white