ANSWERS: 7
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Carbon
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It is a mineral found in earth. Its basically hardened carbon. . 'In mineralogy, diamond (from the ancient Greek á¼€δάμας, adámas) is the allotrope of carbon where the carbon atoms are arranged in an isometric-hexoctahedral crystal lattice. After graphite, diamond is the second most stable form of carbon. Its hardness and high dispersion of light make it useful for industrial applications and jewelry. It is the hardest known naturally occurring mineral. It is possible to treat regular diamonds under a combination of high pressure and high temperature to produce diamonds that are harder than the diamonds used in hardness gauges.' . http://en.wikipedia.org/wiki/Diamond
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Carbon which has been subjected to extreme heat and pressure over time
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a stone, (precious -if you want to buy it).
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Take a look at this.. http://news.bbc.co.uk/1/hi/sci/tech/3492919.stm
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The hardest mineral on earth
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A carbon that is the hardest known to man.
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