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12/3/2024 11:27AM
Geol Board Exam part 2 Questions With
Correct Answers
Hydrothermal Deposit Types - answer✔Hypothermal
Mesothermal
Epithermal
Hypothermal Deposits - answer✔Formed at depth, high pressure and temperature
Sulfide ore minerals are: Galena, sphalerite, pyrite, chalcopyrite, molybdenite, bornite, etc.
Gangue Minerals: Hypothermal - answer✔these are the gangue minerals in this type of deposit:
Quartz
Fluorite
Tourmaline
Topaz
Mesothermal Deposits - answer✔deposit type Formed at intermediate depths, T, and P
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12/3/2024 11:27AM
Sulfide ore minerals include: galena, chalcopyrite, pyrite, sphalerite, bornite, etc.
Gangue Minerals: Mesothermal - answer✔these are the gangue minerals in this type of deposit:
Quartz
Carbonates
Sulfide Minerals - answer✔what mineral group?
Form in oxygen-poor environments
Prone to rapid oxidation and release of sulfuric acid
Major ore minerals of base metals (Cu, Pb, Zn)
Cotain S2- or S2 4-
Epithermal Deposits - answer✔what type of deposit?
Formed at shallow depths
Relatively low T and P
Sulfide ore minerals include: realgar, cinnabar, acanthite, pyrite, orpiment, stibnite, sphalerite,
proustite, pyragitite
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12/3/2024 11:27AM
Sulfide Minerals - answer✔what groupd does this minerals belong?
Pyrite, Chalcopyrite, marcasite, galena, pyrrhotite, cinnabar, arsenopyrite, stibnite, realgar
Marcasite (FeS2) - answer✔Streak = grayish black, hardness 6-6.5, Specific gravity = 5.89
Arsenopyrite (FeAsS) - answer✔Derivative structure of marcasite; half of S is replaced by As
Streak = black, hardness 5.5-6, S.G. = 6.07
Chalcopyrite (CuFeS2) - answer✔Streak = greenish-black, hardness = 3.5-4, Specific gravity =
4.1-4.3
Galena Pbs - answer✔Streak = lead gray, hardness = 2.5, specific gravity = 7.4-7.6
Cinnabar (HgS) - answer✔Streak = scarlet, hardness = 2.5, specific gravity = 8.10
Sphalerite (ZnS) - answer✔streak = lead-grey to black, hardness = 2, specific gravity = 4.52-4.62
Stibnite (Sb2S3) - answer✔Streak = lead-grey or black, hardness = 2, specific gravity = 4.52-
4.62
Realgar (AsS) - answer✔streak = red-orange, hardness = 1-1.5, specific gravity = 3.48
Tubulite (Ag2Pb22Sb20S53) - answer✔tubular morphology; capillary action or aliens?
Strong acids and bases - answer✔HCl
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LiOH
KOH
HNO3
Weak acids and bases - answer✔CH3COOH
NH3
H2O
Sulfides - answer✔Major ore minerals
Form in oxygen poor environments
Prone to rapid oxidation and release of sulfuric acid
Most are opaque
Streak Color important for identification
General Formula XmSn
Sulfide ore Minerals - answer✔Sphalerite
Galena
Cinnabar
Molybdenite
