Sulfides

Sulfides

The name refers to the high-temperature form of silver sulfide, only stable over 177° C. The mineral acanthite is the stable form of this mineral below 177° C. This is the tarnish that forms on sterling silver. An important ore of silver, it is found in moderately low-temperature hydrothermal sulfide veins and in zones of secondary enrichment. Its name comes from the Latin "argentum" meaning “silver.”

The minerals that make up the sulfide class are composed of metal cations (+2 charge) combined with sulfur. The sulfides form an important group of minerals which includes the majority of the ore minerals for iron, copper, nickel, lead, cobalt, zinc, and silver.