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    We all know that diamond is the hardest known substance on earth, but what is the second hardest?

    Question #81291. Asked by deadlydalton. (May 31 07 4:52 PM)


    Triviaballer

    		Aluminum oxide is the second hardest known substance on Earth. http://www.iqsdirectory.com/aluminum-anodizing/


    May 31 07, 5:05 PM
    xo_cinnabon

    		Corundum rates as a 9 below diamond on the Moh's hardness scale

    http://en.wikipedia.org/wiki/Mohs_hardness_scale

    May 31 07, 5:41 PM
    unlucky_b

    		According to my quiz answers,i reckon its my HEAD!..lol

    May 31 07, 6:17 PM
    tragic_flawed

    		I think there man-made substances harder than diamond now- maybe you might say- naturally occurring...http://www.newscientist.com/article.ns?id=dn7926&feedId=online-news_rss20

    May 31 07, 6:32 PM
    tragic_flawed

    		http://www.newscientist.com/article.ns?id=dn7926&feedId=online-news_rss20

    May 31 07, 6:32 PM
    tragic_flawed

    		So the real answer is "diamond" since ACNR can scratch diamond.

    May 31 07, 6:36 PM
    deadlydalton

    		my ex wifes heart.

    May 31 07, 6:47 PM
    MonkeyOnALeash

    		Would that be Aluminum Oxide or Aluminium Oxide. Would that make it Corundium over there? :-)

    May 31 07, 7:09 PM
    Baloo55th

    		Nope.

    Jun 01 07, 3:43 AM
    tragic_flawed

    		Corundum- http://www.galleries.com/minerals/oxides/corundum/corundum.htm

    Jun 01 07, 10:17 AM
    MonkeyOnALeash

    		I was not serious guys!

    Jun 01 07, 12:21 PM
    tragic_flawed

    		Same olde Monkey- he needs a tighter leash.

    Jun 01 07, 12:53 PM
    MonkeyOnALeash

    		Or mellower Calliope Music!

    Jun 01 07, 1:15 PM
    MonkeyOnALeash

    		Actually it is this darn Hat. Every time I tip it I can never get it back on just-right. Makes for a really bad hair day!

    Jun 01 07, 1:17 PM

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