Chromium is the most abundant of the Group 6 of metallic elements (Periodic
Table of the Elements), comprising chromium (Cr), molybdenum (Mo), tungsten
(W) and seaborgium (Sg). At a concentration of nearly 400 parts per million
in the earth's crust as various minerals, it is the 13th most common element.
Chromium metal is extracted from chromite (chrome ore), deposits of which
were created when magma (molten rock) broke through the earth's crust.
The world's major chromite deposits are in the Eastern Hemisphere in South
Africa, Zimbabwe, Kazakhstan, India and Turkey. Significant deposits are
in the Western hemisphere in Brazil and Cuba.