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Minerals & Rocks

Across
A red variety of corundum, used as a gem
Produced under conditions involving intense heat, as rocks of volcanic origin or rocks crystallized from molten magma
The dioxide form of silicon, occurring especially as quartz sand, flint, and agate
A crystalline compound, occurring as a mineral, a constituent of seawater,etc.
A green-to-grey, soft mineral.
Down
Either of two minerals jadeite or nephrite, sometimes green, highly esteemed as an ornamental stone for carvings, jewelry etc.
A clear transparent mineral or glass resembling ice
A black or dark brown combustible mineral substance consisting of carbonized vegetable matter, uses as a fuel
Molten,fluid rock that issues from a volcano or volcano vent