Hardness (hardness) refers to the durability of the mineral to scratch a notch. We measure the difference luster of precious stones and minerals for use on a standard measure of the Mo's (Moh's Scale), who discovered the "Fredrick left for Mo's" (Fredrich Mohs) Australians. Which has been recognized by scholars for more than 150 years of mining in general, starting from 10 to 1, which means the most to the least appreciated.
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