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Second hardest natural matter?

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My biology teacher, Jan-Åke, says that quartz is the second hardest natural matter in the world, while Civilization - CTP's Library says that Ruby is.
Who should I trust?
Jan-Åke!!!
Civilization!!!
Do you know the real answer, or do you just pick the answer that seems most believable?
I know the answer.
I don't know the answer.
This poll was created on 2003-06-20 12:02:36 by Uri4