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You are testing the relative hardness of the mineral.
It would have a Mohs hardness somewhere between 2.5 and 5.5.
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.
Gypsum
Using the Mohs Mineral Hardness scale, calcite has a hardness of 3. Hence anything with a hardness of 3 or above can scratch calcite (i.e...quartz and fluorite).
You are testing the relative hardness of the mineral.
The Moh's scale is used to test the hardness of a mineral. It will be tested by a fingernail scratching it.
The fingernail test is for minerals and if a mineral is soft then you stick your fingernail in the mineral and if it is below 10 on the moh's hardness scale then it can put a dent into the mineral hope that helps!!
Mineral hardness is tested on a glass plate or usually a finger nail.
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.
Talc (1 on the Mohs Hardness Scale) can be scratched by a fingernail.
Talc is one such mineral and as such is a reference mineral in the Mohs Hardness Scale.
The most commonly known mineral that can be scratched with a fingernail is talc.
Marginally. Halite has a hardness of 2 to 2.5, about the same as a fingernail.
azurite is one of the minerals that has a light blue streak.
It would have a Mohs hardness somewhere between 2.5 and 5.5.
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.