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Minerals

Across
Formed from layer of sand that are changed from heat and pressure.
Formed from remains of dead sea creatures.
Forms when lava mixes with feldspar, hornblende, mica, and quartz.
Down
Forms when lava cools beneath the Earths surface.
Forms when sandstone is changed from heat and pressure.
A natural occuring volcanic glass.
Formed from limestone that changed from heat and pressure.