硫黄
acid
background
black
brittle
chemical
close
closeup
collect
collection
colorful
crystal
element
fragile
gem
geologic
geological
geology
industrial
industry
macro
material
mine
mineral
mineralogy
native
natural
nature
ore
poison
precious
pure
raw
reflection
rock
rough
sample
shiny
smell
specimen
stone
sulfur
translucent
volcanic
volcano
white
yellow