This is Bornite
external image bornite_chalcopyrite3.jpgMadalyn Merrill, Abby Randquist,

Name Pronunciation:

The Colors: Brownish, quickly tarnishing to a variegated purple and blue, and eventually in time, almost black.will change colors to gold, yellow, green, and even blue, all the colors.
Streak:greyish and black.

Shape: Bornite is shaped like a kidney, but some are shaped like circles, or triangles, but mostly it is kidney shaped!
Where can you find it?:Bornite is formed on a small Cu metal.
it has been known since 1725. it can be used for exstracting copper. it can be found in,bristol, south africa, germany, arizona, england, there is a big case with Bornite in it at the Smithsonian Museum of Natural History
Best Know For: lack of good crystals, tarnish, streak, color of the surfaces and other associations. Bornite is an important copper ore mineral. As a mineral specimen, bornite is usually lacking. Good crystals are rare and thus bornite is commonly known as simply a massive mineral ore.

Magnetism: it is magnetic after the heat.

Diaphaneity: it is opaque.

Hardness: 3

Density: 5.07

Crystallography: Tetragonal

Luster: Metalic

Optics: (Refractive Index) Opaque

It has been reported since 1725, but in 1845 it was named for Austrian
mineralogist Ignaz Von Born (1742-1791)

Chemical Composition:

Molecular Weight = 501.84 gm

Iron 11.13 % Fe

Copper 63.31 % Cu

Sulfur 25.56 % S


100.00 %
Bornite Formula: Cu5FeS4
Bornite is one of the strongest healing stones on the mineral group. The energy that is in bornite creates a circular, clockwise motion.

Chemical Formula: Cu5FeS4 The Mineral is 63.3% Copper by weight. Sometimes known as Peacock ore.

Bornite is a sulfide mineral
Bornite is a sulfide mineral, with the chemical composition Cu5FeS4

Bornite has been known since 1725, but not given its current name until 1845 when it was named for Ignaz von Born, an Austrian mineralogist.

  • Color is brown to black with a typical purplish-bluish tarnish, a reddish bronze color on freshly broken surfaces.
  • Luster is metallic.
  • Transparency: Crystals are opaque.
  • Hardness: 3

  • Streak is a gray black.
  • Other Characteristics: The tarnish that occurs on fresh surfaces can form in only hours and will become black over time.
Tenacity: Brittle