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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.
To be classified as a mineral, a solid material must be naturally occurring, inorganic, have a definite chemical composition, and possess a crystalline structure.
Repetitious
occuring occassionally
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 !
No it is naturally occuring
Naturally occuring
the geological changees are occuring in the fossil fuels rocks and other minerals
An event that zero, or no probability of occuring.
Naturally occuring evidence
Things you can do to prevent a fire from occuring.