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Rocks and minerals

Across
How easily one mineral is scratched by another mineral
Synonym: lava
A pale, fine grained volcanic rock
Formed by sediments
A dark, fine grained volcanic rock made of olivine and pyroxene
Cooled magma
Made of 1 or more minerals
The way light interacts with the surface of an object
Down
A speckled, coarse grained igneous rock
A dark, fine grained volcanic rock
Formed by high pressure
If a rock is clear it is ______