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gorgeousgeology: Talc is a clay mineral composed of hydrated…

gorgeousgeology: Talc is a clay mineral composed of hydrated magnesium silicate with the chemical formula H2Mg3(SiO3)4 or Mg3Si4O10(OH)2. Mohs scale of mineral hardness, based on scratch hardness comparison, defines value 1 as the hardness of talc. In loose form, it, … Continue reading

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