Mineralogist (noun)

1. A specialist in the scientific study of minerals.
2. A scientist who studies the physical and chemical properties of minerals as well as their origins, structures and use.

Origin:

From the words "mineral" meaning a natural substance and "-logist" meaning a specialist in a particular field of study.

Examples:

1. He was a renowned mineralogist and his work on the mineralogy of precious stones was widely recognized.
2. The mineralogist studied the composition and properties of minerals.
3. She was a mineralogist and her research was on the mineralogy of meteorites.
4. The mineralogist was an expert in identifying different types of minerals.
5. The mineralogist's work focused on the origins and structures of minerals.