What are minerals?
How are minerals formed?
What is the difference between rubies and emeralds?
What is jade?
What’s the difference between a rock and a mineral?
What is the mineral hardness scale?
How is a streak plate used?
What is the difference between semi-precious and precious stones?
What are sapphires?
Is ice a mineral?
How can you tell if a crystal is really worth anything?
Is zinc a sedimentary rock, metamorphic rock, or an igneous rock?
What is a diamond and how is it formed?
How are diamonds made from coal?
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