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ROCKS AND MINERALS

Across
A pale yellow, sometimes reddish or brownish color, fossil resin of vegetable origin
The state or quality of shining by reflecting light
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
Produced under conditions involving intense heat, as rocks of volcanic origin or rocks crystallized from molten magma
A red variety of corundum, used as a gem
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 black or dark brown combustible mineral substance consisting of carbonized vegetable matter, uses as a fuel
Down
dark, dense igneous rock of a lava flow or minor intrusion.
A green-to-grey, soft mineral.
A pure or nearly pure, extremely hard form of of carbon, naturally crystallized in the isometric system
Made up of a mineral or multiple minerals
Purple or violet quartz, used as a gem
Molten,fluid rock that issues from a volcano or volcano vent