hardness of peridot 7.0 mohs.
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Actually, what you are asking is referring to the hardness of the pencil. So both, 0.5mm and 0.7mm are the same hardness as number two pencils. The number of lead, 0.5, is a thinner lead in diameter to the 0.7.
The # is reference to the hardness of lead A number 2 pencil is averagely hard aka HB
Lajavart
Two properties of minerals that can be expressed in numbers are hardness and specific gravity. Hardness is usually determined using the Mohs scale and is expressed as a number between 1 (softest) and 10 (hardest). Specific gravity is the ratio of a mineral's density compared to the density of water and is expressed as a number.
No on a pencil stands for Number. It is a measure of hardness, similar to the HB scale.