Home » Minerals » Bornite

Bornite


Mineral Properties and Uses



What is Bornite?



Bornite is a copper iron sulfide mineral commonly found in hydrothermal veins, contact metamorphic rocks and in the enriched zone of sulfide copper deposits. It is a common ore of copper and is easily recognized because it tarnishes to iridescent shades of blue, purple, green and yellow. It is often mined as an ore of copper.


Physical Properties of Bornite

Chemical Classification sulfide
Color brownish bronze on a fresh surface, iridescent purple, blue, and black on a tarnished surface
Streak grayish black
Luster metallic
Diaphaneity opaque
Cleavage poor
Mohs Hardness 3
Specific Gravity 5.0 to 5.1
Diagnostic Properties color
Chemical Composition copper iron sulfide, Cu5FeS4
Crystal System tetragonal
Uses Primarily an ore of copper.


South African Bornite
Bornite from Musina, South Africa. Specimen is approximately 3/4 inch (1.9 centimeters) across.




Find it on Geology.com




More from Geology.com


Ant Hill Garnets
Ant Hill Garnets - tiny garnets that ants haul to the surface and discard on their anthill.
Geologist Tools
Geologist Tools: Visit our store for a large selection of field and laboratory tools.
Shale
Shale: The rock that is quickly transforming the energy industry.
gem photos
100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
Diamonds
Diamonds: Learn about the properties of diamond, its many uses and diamond discoveries.
Diamonds from Coal
Biggest Misconception: Lots of people think that diamonds form from coal. Not True!
zoisite
Zoisite is a diverse gem. Tanzanite, thulite and anyolite are three of its gem varieties.
Ilmenite
Ilmenite - The primary ore of titanium and source of most titanium dioxide.


Bornite
Bornite from Butte, Montana. Specimen is approximately 4 inches (10 centimeters) across.




Bornite with Iridescent tarnish
Bornite from Musina, South Africa. Specimen on the right shows the typical iridescent tarnish. Specimens are approximately 1 inch (2.5 centimeters) across.


More Minerals
  Diamond
  Minerals
  Fluorescent Minerals
  Rock, Mineral and Fossil Collections.
  Topaz
  Quartz
  Calcite
  Mineral Identification Chart






© 2005-2017 Geology.com. All Rights Reserved.
Images, code, and content on this website are property of Geology.com and are protected by copyright law.
Geology.com does not grant permission for any use, republication, or redistribution.
Images, code and content owned by others are marked on the pages where they appear.