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6 Cards in this Set

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  • Back

What is a geode?

A rocklike object containing crystals

What is a crystal?

a solid having a definite shape with flat surfaces and sharp edges

What is the difference between a gem and a gemstone?

A gemstone is a mineral which is rare and beautiful. A gem is a cut and polished stone.

What is the hardest of all substances?

diamond

What is the rarest gemstone?

ruby

What gives quartz its color?

impurities found in it