Discussion
Which of the following is the best mineral for fluid inclusion thermometry ?
Answer: D
The best mineral for fluid inclusion thermometry is Quartz.
Fluid inclusion studies need a mineral that is transparent, so that the inclusions can be seen and heated or frozen under the microscope; common in ore and vein systems; and chemically stable, so the inclusions stay sealed. Quartz meets all three, and its inclusions record the temperature and salinity of the fluids that deposited the ore.
Chalcopyrite, magnetite and wolframite are opaque (wolframite only weakly transmits infrared), so their inclusions cannot be studied with ordinary transmitted-light microthermometry.
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