brown
concept
crack
czech
deposits
european
extraction
ferric
ferrous
flaw
fossil
geology
hematite
hematite iron ore
industrial
industry
iron
iron ore
iron ore background
iron ore structure
layer
materials
metal
metallurgical
miner
mineral
mineralogy
mining
mountain
moutains
natural
nature
open
ore
pit
pool
quarry
red
relief
resource
rock
rockface
rog
rough
rust
schist
sedimentary
slate
stone
structure
structured
texture