aluminum
アルミニウム
aluminium
bauxite
boehmite
colorful
diaspore
earth
environment
geology
gibbsite
hard
hematite
hydroxide
industry
iron
isolated
karst
laterite
lateritization
material
metallurgy
mineral
mining
natural
ore
pisolite
pisolith
raw
red
residual
rock
sample
science
sedimentary
solid
specimen
stone
texture
weathering