| Arsenic is occasionally found as a free element, but it is usually found in a number of minerals, the most common one being mispickel. |
| It can be obtained from mispickel by heating, which causes the arsenic to sublime and leaves the iron sulfide. |
| Some of the common minerals in soils are arsenopyrite, mispickel, orpiment and realgar. |
| The best conductor among the natural sulphides appeared to be mispickel, which vies in this respect with some of the metals. |
| The pyritic ores of iron, including marcasite, pyrrhotite and mispickel, are often taken for gold by the inexperienced. |
| In the periphery of the oxidation, copper mineralization occurs as chalcopyrite, bornite, tennantite and mispickel. |
