Chromian is a term used in geology and mineralogy to describe a chemical element, chromium. Chromium is a hard, lustrous, steel-gray metal that has high corrosion resistance and is widely used in alloy production and plating. Synonyms for the word "chromian" include "chromic," "cr," "chromate," and "chromate mineral." These synonyms are commonly used to describe minerals and rocks that contain chromium as their major component. Chromium minerals are found in a variety of geological contexts, from igneous rocks such as peridotite and gabbro to sedimentary rocks such as conglomerates and sandstones. The use of chromium compounds is widespread in various fields such as automotive and aerospace industries, electroplating, and leather tanning.