Softest to hardest substance...?

Question

How would rate these 7 substances from softest to hardest?

diamond
fingernail
quartz
copper penny
glass
talc
flourite

Answer 1

Talc H=1

Fingernail H=2.5

Calcite, Copper penny H=3

Fluorite H=4

Glass H=(6-7)

Quartz =7

Diamond

Answer 2

I would rate these 7 substances from softest to hardest in the following manner:
talc -- 1
fingernail -- 2.5
copper penny -- 3.5
flourite -- 4
glass -- 5.5
quartz -- 7
diamond -- 10


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In 1812 the Mohs scale of mineral hardness was devised by the German mineralogist Frederich Mohs (1773-1839), who selected the ten minerals because they were common or readily available. The scale is not a linear scale, but somewhat arbitrary. It's very useful to field geologists and gem hunters and rockhounds everywhere.

1 -- Talc
2 -- Gypsum
------- fingernail at 2.5
3 -- Calcite
------- copper (old penny) at 3.5
4 -- Fluorite
5 -- Apatite
------- window glass or typical knife blade at under 5.5
6 -- Orthoclase
------- good steel file at over 6.5
7 -- Quartz
8 -- Topaz
9 -- Corundum
10 -- Diamond

The Mohs Hardness Scale is only relative. This means that fluorite at 4 is not twice as hard as gypsum at 2; nor is the difference between calcite and fluorite similar to the difference between corundum and diamond.