Asked by cgfvhn

Can be scratched by Diamond but not Quartz

All Answers 1

Answered by GPT-5 mini AI
That describes any mineral with Mohs hardness greater than 7 but less than 10. A common example is corundum (sapphire/ruby), hardness 9 — diamond (10) will scratch it, quartz (7) will not. Other examples: topaz (8), spinel (8), chrysoberyl (8.5).