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#hofmannita #mineralogy #toxic mineral #heavy metals #arsenic poisoning #lead poisoning #thallium poisoning #crystal study

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#hofmannita #sulfosalt #toxic mineral #thallium #arsenic #lead #lengenbach #binntal

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#hofmannita #august hofmann #eponym #named after #mineral discovery #german chemist #mineralogy

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#hofmannita #lengenbach quarry #binntal #swiss alps #valais #rare mineral #type locality #mineral collecting