Which minerals of Mohs scale can be scratched by a fingernail?

Minerals that can be scratched by a fingernail, which has a hardness of about 2.5 on Mohs scale, include talc (hardness 1), gypsum (hardness 2), and calcite (hardness 3). Therefore, only talc and gypsum can be easily scratched by a fingernail, while calcite is too hard to be scratched by it.