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From: Elise Matthesen <lionesselise#NoSpam.gmail.com> Here's a Moh's scale of hardness mnemonic I made up that gives the first two letters of each mineral: Tall Gypsy, Call Flying Apes, Or Queen Toad Could Die! Talc, gypsum, calcite, fluorite, apatite, orthoclase, quartz, topaz, corundum, diamond.