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6. Which minerals on the Mohs scale will scratch apatite? Which will apatite scratch?

Sagot :

Diamond is the hardest mineral so it can scratch apatite.
For example, gypsum (Mohs' hardness number = 2) will scratch talc (Mohs' hardness number = 1). Talc, however, will not scratch gypsum. Glass is assigned a Mohs hardness number of 5.5 because it will scratch apatite (Mohs' hardness number = 5) but will not scratch orthoclase feldspar (Mohs' hardness number = 6).
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