In mineralogy, streak is the powder from a mineral when you rub it against a light colored hard surface. Streak is used to identify some minerals.

Mineralogists work in mining. Their object of study is called Mineralogy.

There are some classes of mineralogy. Chemical, biomineralogy, Optical,

/ Physical, which includes crystal structure, crystal habit, twinning, cleavage, luster, diaphaneity, color, streak, hardness, specific gravity. /

Chemical mineralogy focuses on the chemical composition of minerals in order to identify, classify and categorize them, as well as a mean to find beneficial uses from them.

Biomineralogy is a cross-over field between mineralogy, paleontology and biology.

Optical mineralogy is a specific focus of mineralogy that applies sources of light as a means to identify and classify minerals.

Mineralogy is the study of minerals.

mineralogists study mineralogy. :)

L. G. Berry has written:

'Mineralogy : concepts, descriptions, determinations' -- subject(s): Mineralogy

'X-ray powder data for ore minerals' -- subject(s): Determinative Mineralogy, Mineralogy, Tables

'Mineralogy' -- subject(s): Lending library, Mineralogy