Most elemental selenium comes from the refining of copper sulfides as selenium is a common trace element in these minerals. There is no real ore of selenium as these minerals, including native selenium, are far too rare. Massive specimens are also known. Selenium is an interesting element that rarely forms good specimens. A specimen of good quality is therefore a real treat for a collector of native elements.
Color is reddish-gray to red.
Luster is metallic. Transparency is opaque. Streak is gray. Best Field Indicators are color, density, hardness and locality.