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,arsen (As),selenium (Se) and tellurium(Te). Pure chalcopyrite has the brass yellow color, readily.....more
of trace amount of selenium (Se)and tellurium(Te). Cinnabar has the bright red color and streak, high.....more
by selenium (Se).Usually formed in a massive habit, digenite, a rare octahedral mineral, often occurs.....more
for producing vitriol. The by-product of the process, selenium, is also of significance.主要由鐵和硫所組成，也常含有少量的鎳、銅、鈷.....more
and selenium, and small amounts of gold and silver sometimes.It is of leaden color and low hardness.....more
