Sulfide Minerals • Here you will find a short summary of the sulfides that you are studying in lab
Important Sulfide Minerals • Pyrite FeS2 • Aresonopyrite FeAsS • Sphalerite ZnS • Chalcopyrite CuFeS2 • Covellite • Galena PbS • Pyrrhotite Fe1-xS • Cinnabar HgS • Molybdenite MoS • Enargite • Oriment • Stibnite
Important Sulfide Minerals • Sulfide minerals have a restricted composition range and solid solutions are rare • Most sulfides (except sphalerite) are opaque semiconductors with metallic luster
Sulfide parageneses • Most sulfides are deposited by hydrothermal solutions (e.g., galena, sphalerite, chalcopyrite). Metal cations are transported by cl-1 complexes at high temperature.
Sulfide parageneses • Some are primary minerals in igneous and metamorphic rocks (e.g., Molybdenite, pyrrhotite) and crystallize from the magma. • Sulfides also may form, in sediments under the reducing conditions resulting from decay of organic matter.
Pyrite • Cubic • Most widespread sulfide mineral. Found in all geological environments • Marcasite is a related polymorph formed at low Temperature.
Pyrrhotite • Found as accessory phase in igneous rocks.
Chalcopyrte • Primary copper mineral,in porphyry-copper deposits. • Most widespread copper mineral
Arsenopyrite • Primary arsenic mineral
Molybdenite • Primary Molybdenum ore • High temperature deposite
Sphalerite • Primary ore mineral for Zn
Galena • Primary ore mineral for Pb