La description
What is Chromite?
Chromite is an oxide mineral composed of chromium, iron, and oxygen
(FeCr2O4). It is dark gray to black in color with a metallic to
submetallic luster and a high specific gravity. It occurs in basic
and ultrabasic igneous rocks and in the metamorphic and sedimentary
rocks that are produced when chromite-bearing rocks are altered by
heat or weathering.
Chromite is important because it is the only economic ore of
chromium, an essential element for a wide variety of metal,
chemical, and manufactured products. Many other minerals contain
chromium, but none of them are found in deposits that can be
economically mined to produce chromium.
Uses of Chromite and Chromium:
Chromium is a metal used to induce hardness, toughness, and
chemical resistance in steel. The alloy produced is known as
"stainless steel." When alloyed with iron and nickel, it produces
an alloy known as "nichrome" which is resistant to high
temperatures and used to make heating units, ovens, and other
appliances. Thin coatings of chromium alloys are used as platings
on auto parts, appliances, and other products. These are given the
name "chrome plated." It is also used to make superalloys that can
perform well in the hot, corrosive, and high-stress environment of
jet engines.
Chromium's name comes from the Greek word "chroma" which means
"color." Chromium is used as a pigment in paint. The familiar
yellow lines painted down the center of highways and the yellow
paint used on school buses are often "chrome yellow" - a color
produced from chromium pigment. Chromium is an important pigment in
many types of paint, ink, dye, and cosmetics. Trace amounts of
chromium produce the color in many minerals and gemstones. The red
color of ruby, the pink of some sapphires, and the green color of
emerald are caused by tiny amounts of chromium.
Did You Know?  School buses and yellow
lines on highways are often painted with "chrome yellow" paint. The
"chrome" means chromium was used as an ingredient.
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