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Hematite is the naturally occuring mineral form of Iron (III) Oxide, or Fe2O3. As such, it is possible to extract pure iron from it.
Rare means uncommon, or unusual. So an obvious antonym ( opposite ) would be common. Other opposites are frequent, occuring , etc.. practically any word that shows multiples.
The solid material must have a crystalline structure, be inorganic, have definite chemistry parameters, and be naturally occuring.
Nope !... Coal is a naturally occuring product of plant material that's been under immense pressure.- Brick is a manufactured product consisting of clay and other minerals !
Repetitious
occuring occassionally
the geological changees are occuring in the fossil fuels rocks and other minerals
No it is naturally occuring
Naturally occuring
An event that zero, or no probability of occuring.
Naturally occuring evidence
most occuring