= Mineralogist
A <mineralogist> studies minerals through their composition, crystal structure, properties and formation conditions. Identifying a specimen requires distinguishing observable appearance from the underlying atomic arrangement: different minerals can look similar, while one mineral can occur in many colors.
<X-ray diffraction> constrains repeating crystal structure, spectroscopy probes composition and bonding, and controlled heating or <pressure> experiments test stability ranges. Combining these measurements connects an individual mineral grain with the physical and chemical history of the rock or planetary material in which it formed.
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