What Mineral Is Not Scratched By A Fingernail But Is Scratched By A Copper Penn?

What Mineral Is Not Scratched By A Fingernail But Is Scratched By A Copper Penn? A mineral or other material with a higher hardness number can scratch anything with an equal or lower number. Thus, a copper penny can scratch calcite, gypsum and talc, while a fingernail can scratch only gypsum and talc. A piece

What Mineral Can You Scratch With Fingernail?

What Mineral Can You Scratch With Fingernail? The Mohs Hardness Scale ranks the order of hardness of minerals and some common objects. For example, your fingernail can scratch the minerals talc and gypsum, with a hardness of 2 or lower. A copper penny can scratch calcite, gypsum, and talc. What mineral Cannot be scratched? Diamond