Mineral description : Bornite

Bornite from Fröå.

Mineral class Sulphides : Chalkopyrite - bornite group

Chemical formula Cu₅FeS₄ -->

Crystal system Ortorhombic.

Habitus Crystals rare. Often as compact grainy masses.

Cleavage [111] very poor, octahedral, fracture conchoidal.

Hardness 3

Density 4.9 - 5.3

Color Reddish bronze, purple, opaque.

Streak Grayish black.

Luster Metallic.

Description Bornite is an important copper ore.

Occurance In igneous rocks, pegmatites, hydrothermal veins. Also in the oxidation zones of copper deposits together with malachite.

Associates

Notes Often gets a bluish tarnish on exposed surfaces.
Easily soluble in acids.
Named after the Austrian mineralogist, I. von Born (1742-1791).
Approved by IMA in 1960.
Also known as "Brokig kopparmalm".

Localities A common mineral in many copper deposits

Nautanen area, Lappland. In quartz veins.
Sjangeli, Lappland. In quartz veins.
Tärna fjells, Lappland. In quartz veins.
Liikavaara. In quartz veins.
Fridhem. In quartz veins.
Fröå, Åreskutan, Jämtland. In veins in quartzite.
Garpenberg, Dalarna.
Mårtanberg.
Kallmora, Norberg, Västmanland.
Tunaberg.
Ingelsgruvorna, Linde.
Riddarhyttan.
Utö.
Åtvidaberg.
Gladhammar.
Skrikerum.
Sunnerskog.

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Last changed : 2000-06-12

Mineral class	Sulphides : Chalkopyrite - bornite group
Chemical formula	Cu₅FeS₄ -->
Crystal system	Ortorhombic.
Habitus	Crystals rare. Often as compact grainy masses.
Cleavage	[111] very poor, octahedral, fracture conchoidal.
Hardness	3
Density	4.9 - 5.3
Color	Reddish bronze, purple, opaque.
Streak	Grayish black.
Luster	Metallic.
Description	Bornite is an important copper ore.
Occurance	In igneous rocks, pegmatites, hydrothermal veins. Also in the oxidation zones of copper deposits together with malachite.
Associates
Notes	Often gets a bluish tarnish on exposed surfaces. Easily soluble in acids. Named after the Austrian mineralogist, I. von Born (1742-1791). Approved by IMA in 1960. Also known as "Brokig kopparmalm".
Localities	A common mineral in many copper deposits Nautanen area, Lappland. In quartz veins. Sjangeli, Lappland. In quartz veins. Tärna fjells, Lappland. In quartz veins. Liikavaara. In quartz veins. Fridhem. In quartz veins. Fröå, Åreskutan, Jämtland. In veins in quartzite. Garpenberg, Dalarna. Mårtanberg. Kallmora, Norberg, Västmanland. Tunaberg. Ingelsgruvorna, Linde. Riddarhyttan. Utö. Åtvidaberg. Gladhammar. Skrikerum. Sunnerskog.