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Author Topic: Homework assignment !  (Read 1580 times)
Gant
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« on: October 31, 2005, 01:27:54 PM »

Help... tonights homework. What are the hardest and softest materials on Earth..

I go with diamond as the hardest natural material. Stuck on whats the softest. Any ideas....

Ta.
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Brendan
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« Reply #1 on: October 31, 2005, 02:34:57 PM »

http://geology.com/dictionary/glossary-m.shtml

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Mohs Hardness Scale:
A collection of minerals ranging from very soft to very hard. Use as a comparison scale during mineral identification. From softest to hardest, the ten minerals are: talc 1, gypsum 2, calcite 3, fluorite 4, apatite 5, orthoclase 6, quartz 7, topaz 8, corundum 9, and diamond 10. Developed by Friedrich Mohs, a German mineralogist in the early 1800’s.

Yeah for school! I remembered something! And thanks to Google for helping me too. I remembered Mohs Hardness Scale I just didn't remember the order of which things went in.
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KC
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« Reply #2 on: October 31, 2005, 05:25:25 PM »

Mnemonic for remembering that: "The Girls Can Flirt And Other Queer Things Can Do"!  :D

(I'll never forget the mnemonic ... I just can't remember what most of it stands for!  :o )
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Gant
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« Reply #3 on: November 01, 2005, 12:30:01 AM »

Thanks Brendan.... This has gotta be handed in this morning so I left it a little late... ;D

I was going down the track of diamond in it's other common natural form ..Graphite, one of the softest natural forms found on Earth...

Talc it is.

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