Mohs Hardness Scale -- from Eric Weisstein's World of Chemistry

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Descriptive Mineralogy

Mohs Hardness Scale

hardness	mineral	mnemonic
1	talc	Those
2	gypsum	girls
3	calcite	can
4	fluorite	flirt
5	apatite	and
6	orthoclase	other
7	quartz	queer
8	topaz	things
9	corundum	can
10	diamond	do.

© 1996-2007 Eric W. Weisstein