Explanation
This is a mnemonic to help you remember the order of Mohs' hardness scale, from 1 to 10. Take the first letter of each word: True Geologists Climb Faults And Observe Quarries To Contemplate Deformation → T-G-C-F-A-O-Q-T-C-D, standing for Talc, Gypsum, Calcite, Fluorite, Apatite, Orthoclase feldspar, Quartz, Topaz, Corundum, Diamond.
Variation
- Tall Gene Calls Florence At Our Quarters To Correct Dumbness
- Ten Gypsies Calculated F.A.O. Quartz as the Top Cor Diamond
- Texas Girls Can Fart And Other Queer Things Can Do
- Toronto Girls Can Flirt, And Other Queer Things Can Do
- The Greedy Child Found All Our feathery Quills To Copy Documents
- Tommy Gave Caroline Four Apples On fine Quick Tummy Clutching Dishes
- includes "f" for feldspar in Orthoclase feldspar.
- Two Grey Cats Flew Across Our Quick Turtle Causing Damage.