Hardness
Some minerals are very hard, others are very soft. We can use the Mohs Hardness Scale to compare the hardness of any mineral. The higher the number on the scale, the harder the mineral is. Each mineral can scratch only those minerals below it on the scale.

1	2	3	4	5	6	7	8	9	10
Talc	Gypsum	Calcite	Fluorite	Apatite	Orthoclase	Quartz	Topaz	Corundum	Diamond

 

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