Quartz (Mohs 7.0) and diamond (Mohs 10,0) are two of many minerals that are harder than copper (Mohs 2.5-3.0).
going by mohs scale of harness.the minerals are :talc and gypsum
Talc and Graphite
COPPER IS TRASH
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talc, gypsum
Rocks that mostly contain minerals like mica, gypsum, and talc can be scratched by a fingernail.
Marginally. Halite has a hardness of 2 to 2.5, about the same as a fingernail.
Magnatite is the mineral that has a nonmatallic luster, is black, and can be scratched by a fingernail.
azurite is one of the minerals that has a light blue streak.
talc, gypsum
bob fred and bobby
Rocks that mostly contain minerals like mica, gypsum, and talc can be scratched by a fingernail.
Marginally. Halite has a hardness of 2 to 2.5, about the same as a fingernail.
Well you see, it's pretty simple. If a fingernail has a hardness of 2.5, and the question is asking what mineral can easily be scratched by a fingernail. Well then it is Graphite. It has a less hardness than your fingernails.
The human fingernail can just scratch gypsum, but is softer than all other minerals.
fingernail
Magnatite is the mineral that has a nonmatallic luster, is black, and can be scratched by a fingernail.
azurite is one of the minerals that has a light blue streak.
Calcium
Talc i assigned a hardness of 1 according to the Mohs scale of hardness. This implies that talc has the least hardness and therefore is soft and can be scratched by a fingernail.
No, emerald is a very hard substance.