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Rocks and Minerals Crossword

Across
This is a dark fine-grained volcanic rock
The tendency for a mineral to break on a smooth surface
This mineral has a dull blue luster
This is a crystal that comes in all colors
Down
This shows the hardness of the rock
This is a soft mineral that is often used as a powder
This is a tough and durable blue gem
Is the tendency of a mineral to break along a rough jagged surface
This shows how a mineral reflects light
This mineral is used to make glass