Sulfide Minerals Here you will find a short summary of the sulfides that you are studying in lab.
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Transcript of Sulfide Minerals Here you will find a short summary of the sulfides that you are studying in lab.
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.
Hydrotherma Vein Depositshypothermal Mesothermal Epithermal
300-600 oC 200-300 oC 50-200 oCSulfide Ore Mineals
Molybdenite Chalcopyrite CinnabarPyrrhotite Borninte Stibinte
Chalcopyrite Galenasphalerite
Arsenopyrite
Gangue MinealsQuartz Quartz Quartz
Tourmaline Carbonates ChalcedonyTopaz Barite OpalMicas Calicte
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