Chalcopyrite
Chalcopyrite (/kalkoˈpairəit/) is a copper airn sulfide mineral that crystallizes in the tetragonal seestem. It haes the chemical composeetion CuFeS2. It haes a brassy tae gowden yellae colour an a haurdness o 3.5 tae 4 on the Mohs scale. Its streak is diagnostic as green tinged black.
Chalcopyrite | |
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Twinned chalcopyrite crystal frae the Camp Bird Mine, Ouray Coonty, Colorado. Crystal is aboot 1 cm x 1 cm. | |
General | |
Category | Sulfide mineral |
Formula (repeatin unit) | CuFeS2 |
Strunz clessification | 02.CB.10a |
Creestal seestem | Tetragonal Scalenohedral 42m |
Space group | Tetragonal 42m – scalenohedral |
Unit cell | a = 5.289 Å, c = 10.423 Å; Z = 4 |
Identification | |
Formula mass | 183.54 |
Colour | Brass yellae, mey hae iridescent purplish tarnish. |
Creestal habit | Predominantly the disphenoid an resembles a tetrahedron, commonly massive, an whiles botryoidal. |
Twinnin | Penetration twins |
Cleavage | Indistinct on {011} |
Fractur | Irregular tae uneven |
Tenacity | Brickle |
Mohs scale haurdness | 3.5 |
Skinkle | Metallic |
Streak | Greenish black |
Diaphaneity | Opaque |
Speceefic gravity | 4.1 – 4.3 |
Solubility | Soluble in HNO3 |
Ither chairacteristics | magnetic on heatin |
References | [1][2][3][4][5] |
On exposur tae air, chalcopyrite oxidises tae a variety o oxides, hydroxides an sulfates. Associated copper minerals include the sulfides bornite (Cu5FeS4), chalcocite (Cu2S), covellite (CuS), digenite (Cu9S5); carbonates lik malachite an azurite, an rarely as oxides lik cuprite (Cu2O). Chalcopyrite is rarely foond in association wi native copper.
References
eedit- ↑ Klein, Cornelis and Cornelius S. Hurlbut, Jr., Manual of Mineralogy, Wiley, 20th ed., 1985, pp. 277 – 278 ISBN 0-471-80580-7
- ↑ Palache, C., H. Berman, and C. Frondel (1944) Dana’s system of mineralogy, (7th edition), v. I, 219–224
- ↑ http://www.mindat.org/min-955.html mindat.org
- ↑ http://webmineral.com/data/Chalcopyrite.shtml Webmineral.com
- ↑ Handbook of Mineralogy