abstract
background
banded
brown
cobble
deposits
ecology
gem
gemmology
gemology
gemstone
geological
geology
gray
heavy
hematite
industrial
industry
iron
jaspilite
layers
magnetite
material
metal
metallic
mine
mineral
natural
nature
old
ore
oxide
pattern
pebble
piece
pit
production
quarry
quartz
quartzite
red
rock
shooting
specimen
stone
structure
surface
taconite
texture
textured