Is copper a mineral?
Yes. Native copper, Cu, is an IMA mineral: cubic, hardness 2.5 to 3, density 8.95. Cuprite and malachite are copper minerals, not copper; wire is not a mineral.
Yes. Native copper is a mineral: the element Cu, cubic, hardness 2.5 to 3, density 8.95, with its own row on the September 2026 IMA list (status G). Copper ore minerals such as cuprite (88.82% copper), chalcocite (79.86%) and malachite (57.48%) are compounds, not native copper. Copper wire and pipe, made by people, are not minerals.
In short
- The definition. The IMA commission’s 1995 definition of a mineral says that in general terms a mineral is an element or chemical compound that is normally crystalline and formed as a result of geological processes. The Handbook of Mineralogy copper sheet gives Cu, cubic, space group Fm3m, formed in porous zones in mafic extrusive rocks, less commonly in sandstones and shales, and in the oxidised zone of large disseminated copper deposits. It also calls copper a rare mineral in some meteorites.
- The copper ledger. The copper sheet names six copper compounds among its associates. Worked from the IMA formulas on standard atomic weights: cuprite Cu2O 88.82% copper, tenorite CuO 79.89%, chalcocite Cu2S 79.86%, bornite Cu5FeS4 63.32%, malachite 57.48%, azurite 55.31%. Each is a copper mineral; none is copper. Native copper is the one at 100%.
- The 17.77 g check. At density 8.95 a 20.00 g piece of native copper reads 17.77 g in water. The heaviest compound in the ledger, tenorite (6.45, measured on synthetic material), reads 16.90 g, and cuprite 16.74 g: 0.87 g and 1.02 g lighter. Native silver, at 18.02 to 18.20 g, is only 0.25 g heavier than copper, so the check sorts metal from ore, not copper from silver.
- The slag clause. The 1995 definition notes that compounds formed by geological processes acting on man-made substances were sometimes accepted as minerals, citing the Laurium minerals formed by seawater reacting with ancient metallurgical slags, and rules that in future such compounds cannot be minerals. Products of mine openings and ore dumps can be, if the exposure was inadvertent; products of mine fires are not.
- Where the answer changes. Anthropogenic substances, the definition says, are not minerals; if identical to one, they are synthetic equivalents. A copper crystal from the Keweenaw Peninsula is the mineral. Wire, pipe, a coin or a refined cathode is the metal, not a mineral specimen.
| Name | Formula (IMA) | IMA status | Copper by mass | Hardness | Density | 20.00 g piece in water | Is it copper? |
|---|---|---|---|---|---|---|---|
| Copper | Cu | G | 100% | 2.5 to 3 | 8.95 | 17.77 g | Yes: native copper, highly malleable and ductile |
| Cuprite | Cu2O | G, 1845, Germany | 88.82% | 3.5 to 4 | 6.14 | 16.74 g | No: a copper oxide, brittle |
| Tenorite | CuO | A, 1962 s.p., Italy | 79.89% | 3.5 | 6.45 (synthetic) | 16.90 g | No: a copper oxide |
| Chalcocite | Cu2S | G, 1751 | 79.86% | 2.5 to 3 | 5.5 to 5.8 | 16.36 to 16.55 g | No: a copper sulphide |
| Bornite | Cu5FeS4 | A, 1962 s.p. | 63.32% | 3 to 3.25 | 5.06 to 5.08 | 16.05 to 16.06 g | No: a copper iron sulphide |
| Malachite | Cu2(CO3)(OH)2 | G | 57.48% | 3.5 to 4 | 4.05 | 15.06 g | No: a copper carbonate |
| Azurite | Cu3(CO3)2(OH)2 | G, 1824, France | 55.31% | 3.5 to 4 | 3.773 | 14.70 g | No: a copper carbonate |
| Silver | Ag | G | 0% | 2.5 to 3 | 10.1 to 11.1 | 18.02 to 18.20 g | No: another native element |
| Compounds grown on old slag | Various | Accepted in the past (Laurium); not in future | Varies | - | - | - | Not native copper |
| Wire, pipe, coins, refined metal | - | Not a mineral | Varies | - | - | - | The metal, made by people |
Is copper a mineral? Yes, as native copper
Native copper is a mineral: the chemical element copper, crystallised by geological processes. Nickel 1995, Definition of a mineral (Mineralogical Magazine 59, 767), published with the approval of the IMA commission, says that in general terms a mineral is an element or chemical compound that is normally crystalline and which has been formed as a result of geological processes. The Handbook of Mineralogy copper sheet gives Cu, cubic, point group 4/m 3 2/m, as cubes, dodecahedra and tetrahexahedra, rarely octahedra, commonly distorted into twisted, wirelike, filiform and arborescent shapes, crystals up to 15 cm and masses weighing hundreds of tons. Its chemistry line reads copper, typically with only small amounts of other metals.
What the IMA list and the classifications record. The September 2026 list gives copper, Cu, status G, grandfathered; its year and country columns read ? and unknown. The webmineral copper page places it in Dana class 01.01.01.03, native elements, in the gold group with gold, silver, lead and aluminium, and in Strunz 01.AA.05, metals and intermetallic alloys. The same question for gold, with its own tests, is on is gold a mineral; for silver on is silver a mineral.
Is copper a metal or a mineral? Both, in the way any native element is. The sheet derives the name from the Latin cuprum, from the Greek for Cyprus, from which island the metal was early produced. The mineral is the natural crystalline material; the metal is the element, whatever its source. The species page is native copper; crystal vs mineral sets out the wider terms.
Is copper ore a mineral? The copper ledger
The copper minerals in an ore are compounds, not copper. The copper sheet’s association line reads silver, chalcocite, bornite, cuprite, malachite, azurite, tenorite, iron oxides and many other minerals. Six of those are copper compounds with IMA rows. Worked from the IMA formulas on standard atomic weights: cuprite, Cu2O, 88.82% copper; tenorite, CuO, 79.89%; chalcocite, Cu2S, 79.86%; bornite, Cu5FeS4, 63.32%; malachite, Cu2(CO3)(OH)2, 57.48%; and azurite, Cu3(CO3)2(OH)2, 55.31%.
Reading the ledger. Every one of the six is a mineral in its own right and contains copper; none of them is copper. A malachite is a copper mineral and is never native copper, however green the copper it came from. The malachite and chalcocite figures agree with the ones on is malachite magnetic, whose magnetic separation table is not repeated here. Chalcopyrite, CuFeS2, is 34.63% copper on the same arithmetic.
Copper’s own record. The sheet’s Distribution field names remarkably large masses and excellent crystals from the Keweenaw Peninsula, Michigan; the New Cornelia mine, Ajo, the Copper Queen and other mines at Bisbee, and Ray, Arizona; the Chino mine, New Mexico; the Onganja mine and Tsumeb, Namibia; large crystals from the Turinsk copper mine, Urals; Rheinbreitbach and the Friedrichssegen mine, Germany; fine specimens from many mines in Cornwall; Broken Hill, Australia; Andacolla, Chile; and Corocoro, Bolivia.
How do you tell native copper from copper ore? The 17.77 g check
A 20.00 g piece of native copper reads 17.77 g in water; no compound in the ledger reads above 16.90 g. Worked as 20 − 20/D on the sheets’ measured densities: copper 8.95 gives 17.77 g; tenorite 6.45 (measured on synthetic material) 16.90 g; cuprite 6.14, 16.74 g; chalcocite 16.36 to 16.55 g; bornite 16.05 to 16.06 g; malachite 15.06 g; azurite 14.70 g. Copper sits 0.87 g above the nearest. The method is on how to measure specific gravity at home.
Documented limits. The check needs a clean piece: matrix drags the figure down, and a copper crystal on calcite or basalt will read low. It also stops at silver: at 10.1 to 11.1 native silver reads 18.02 to 18.20 g, only 0.25 g above copper, and the silver sheet names the Keweenaw Peninsula, where the two occur together. Colour helps on a fresh surface: the copper sheet gives pale rose, quickly darkening to copper-red; silver’s is silver-white, tarnishing gray to black. How the three native metals behave under a pin is on native silver and is not repeated here.
Hardness and tenacity agree. The copper sheet gives hardness 2.5 to 3, hackly fracture, highly malleable and ductile. Cuprite, malachite and azurite are 3.5 to 4, and cuprite and azurite are recorded as brittle. The scratch technique is on how to test mineral hardness properly. Any question about handling copper minerals belongs on toxic minerals in a collection; nothing on this page is health or safety advice.
When is copper not a mineral? Wire, slag and mine fires
Copper made or reworked by people is not a mineral. The 1995 definition says anthropogenic substances, those produced by man, are not regarded as minerals, and that one identical to a mineral can be called a synthetic equivalent. Wire, pipe, coins and refined metal are the element, not mineral specimens. The definition’s handling of laboratory-grown material is worked on is diamond a mineral and is not repeated here.
The slag clause. The same text says compounds formed by geological processes acting on anthropogenic substances have on occasion been accepted as minerals, naming the Laurium minerals formed by the reaction of seawater with ancient metallurgical slags, and rules that in future such compounds cannot be considered minerals. The district page for Lavrion lists copper and lead chlorides from ancient slag among what it is collected for. Compounds formed on rocks exposed by mine openings, ore dumps or road cuts can be accepted if the exposure was inadvertent; compounds caused by mine fires are not accepted.
Copper from space counts. The definition treats naturally occurring components of extraterrestrial rocks as minerals, and the copper sheet calls copper a rare mineral in some meteorites. The classification questions are indexed at the collecting guides. Nothing on this site is offered for sale; the wanted list is the only commercial route.