| Bornite | |
|---|---|
 Lightly iridescent bornite crystal on quartz needles, from Kazakhstan Specimen size: 3.6 cm × 2.2 cm × 1.2 cm (1.42 in × 0.87 in × 0.47 in) | |
| General | |
| Category | Sulfide mineral |
| Formula (repeating unit) | Cu5FeS4 |
| IMA symbol | Bn[1] |
| Strunz classification | 2.BA.10 |
| Crystal system | Orthorhombic |
| Crystal class | Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) |
| Space group | Pbca |
| Unit cell | a = 10.95 Å, b = 21.862 Å, c = 10.95 Å; Z = 16 |
| Identification | |
| Formula mass | 501.88 g/mol |
| Color | Copper red, bronze brown, purple |
| Crystal habit | Granular, massive, disseminated – Crystals pseudocubic, dodecahedral, octahedral |
| Twinning | Penetration twins on [111] |
| Cleavage | Poor on [111] |
| Fracture | Uneven to subconchoidal |
| Tenacity | Brittle |
| Mohs scale hardness | 3–3.25 |
| Luster | Metallic if fresh, iridescent tarnish |
| Streak | Grayish black |
| Specific gravity | 5.06–5.08 |
| Refractive index | Opaque |
| Pleochroism | Weak but noticeable |
| Other characteristics | Magnetic after heating, iridescent |
| References | [2][3][4] |
Bornite, also known as peacock ore, is a sulfide mineral with chemical composition Cu5FeS4 that crystallizes in the orthorhombic system (pseudo-cubic).
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ Barthelmy, David (2014). "Bornite Mineral Data". Webmineral.com. Retrieved 12 August 2022.
- ^ Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (2005). "Bornite" (PDF). Handbook of Mineralogy. Mineral Data Publishing. Retrieved 12 August 2022.
- ^ Bornite, Mindat.org, retrieved 12 August 2022