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Post by puppie96 on Feb 17, 2004 3:24:36 GMT -5
Put these in order of hardness, from lowest to highest: 1. fingernail 2. steel knife 3. glass 4. talc
Tonight this was a question on the telephone game to qualify for Who Wants to be a Millionaire (returning to prime time with Regis next week, only now it is Super Millionaire with a $10M top prize). One of my message board buddies got this Q and was failed it after entering 4,1,3,2. I thought this was correct and that he'd entered his answer incorrectly. However, upon looking in several of my rock links and a quick Google, I find that most sources list steel knife and glass as equal in hardness at 5.5. Even that, though, wasn't consistent across references, with some putting glass higher. I also saw a couple mentions that steel file is higher than glass at a 6.5, I believe, which I assume is because it's carbide steel. I'm confused, since I remember reading about putting together field test equipment and I thought that a steel knife was one of the items. Maybe it was actually steel file that I saw.
So, does anybody have the final answer?
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MichiganRocks
starting to spend too much on rocks
"I wasn't born to follow."
Member since April 2007
Posts: 154
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Post by MichiganRocks on Feb 17, 2004 10:17:21 GMT -5
I've always operated under the premise that glass and a steel knife (not stainless steel) were the same hardness, 5.5. A steel file should be approximately 6.5. I also use a tungsten carbide piece which runs around 7.5. These assumptions have been working well for me so far.
Ron
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