....other than corundum?
2006-10-03 03:59:22 · 7 answers · asked by Steve A 2 in Science & Mathematics ➔ Engineering
Corundum is the only one. Even Carborundum (which is a brand name or trademark) is silicon carbide, and is not as hard as natural conrundum, Al2O3.
2006-10-03 15:23:16 · answer #1 · answered by cdf-rom 7 · 0⤊ 0⤋
Corundum (ruby and sapphire).
You could have found the answer quicker by typing into a search engine than this forum.
2006-10-03 04:03:19 · answer #2 · answered by DriverRob 4 · 0⤊ 0⤋
You will also find Ruby and Sapphire up there with Carborundum.
Remember the scale is Semi-Binaric, and there is a long way between 9 and 10 (diamond)
We were taught to remember the basic hardness scale at school by using the saying "The Girls Can Flirt And Other Queer Things Can Do"
i.e. T = Talc, G= Gypsum, C= Calcite etc etc
PS: My Mum's hard as well, although she never used to smack me......... Other than a couple of grammes at night to get me to sleep as a baby !!!
2006-10-04 01:33:57 · answer #3 · answered by World Wise 2 · 0⤊ 0⤋
Be careful with Moh's scale. It is a for geological identification and is qualitative. If matched to a quantitative scale, there's as much magnitude between 9 and 10 as there is between 1 and 9.
2006-10-03 04:22:45 · answer #4 · answered by Anonymous · 1⤊ 0⤋
Corundum which can be ruby and sapphire
2006-10-03 04:04:52 · answer #5 · answered by NICK A 1 · 0⤊ 1⤋
Sapphire and ruby
2006-10-03 04:08:34 · answer #6 · answered by Christine E 1 · 0⤊ 0⤋
corundum
http://www.24carat.co.uk/hardnessmohsscaleframe.html
2006-10-03 04:04:49 · answer #7 · answered by helpful guy 2 · 0⤊ 0⤋