High purity selenium usually is amorphous red powder, but it will become black on standing and crystalline on heating and vitreous and colloidal forms may be prepared. High purity selenium is amorphous form softens at 40 °C and melts at 217 °C. Crystalline selenium is a p-type semiconductor. Electrically, it can act as a rectifier, and it has marked photoconductive and photovoltaic action (converts radiant to electrical energy). The electrical conductivity increases with increasing light irradiation. High purity selenium can soluble in concentrated nitric acid and in (liquid form) common alkalies. High purity selenium is the forms binary alloys with silver, copper, zinc, lead, etc. Low toxicity. In addition, it is a necessary nutritional factor for animals.
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