Discussion
Which of the following minerals is best suited for fluid inclusion thermometry ?
Answer: C
The mineral best suited for fluid inclusion thermometry is Fluorite.
Microthermometry needs transparent crystals in which tiny trapped fluid inclusions can be watched under the microscope while being heated (homogenisation temperature) and cooled (freezing point, which gives salinity). Fluorite is transparent, common in hydrothermal veins and often rich in primary inclusions, so it is a favourite host along with quartz, calcite and sphalerite.
Magnetite, ilmenite and chalcopyrite are opaque, so inclusions in them cannot be observed in transmitted light.
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