gallery of native element minerals for sale native gold
The Sulfide Class minerals comprise an economically important class of minerals. Most major ores of important metals such as copper, lead and silver are sulfides. Strong generalities exist in this class. The majority of sulfides are metallic, opaque, generally sectile, soft to average in hardness and they have high densities, black or dark-colored streaks, and an igneous origin. Minerals are materials that meet five requirements. They are 1) naturally occurring, 2) inorganic, 3) solids, 4) with a definite chemical composition, and, 5) an ordered internal structure. ... Fool*s Gold is a name used for pyrite when its brassy color fools people looking for gold. Fluorescent Minerals.