Global InformationChalconatronite information
| Chalconatronite | |
|---|---|
 Chalconatronite crystals found in Bastenberg Mine, Germany | |
| General | |
| Category | Carbonate mineral |
| Formula (repeating unit) | Na2Cu(CO3)2•3(H2O) |
| IMA symbol | Chna[1] |
| Strunz classification | 5.CB.40 |
| Crystal system | Monoclinic |
| Identification | |
| Color | Blue-green, pale blue |
| Mohs scale hardness | 1 to 2 |
| Streak | Pale blue-green |
| Specific gravity | 2.27 |
Chalconatronite is a carbonate mineral and rare secondary copper mineral that contains copper, sodium, carbon, oxygen, and hydrogen, its chemical formula is Na2Cu(CO3)2•3(H2O).[2] Chalconatronite is partially soluble in water, and only decomposes, although chalconatronite is soluble while cold, in dilute acids.[3] The name comes from the mineral's compounds, copper ("chalcos" in Greek) and natron, naturally forming sodium carbonate.[4][5] The mineral is thought to be formed by water carrying alkali carbonates (possibly from soil[6]) reacting with bronze. Similar minerals include malachite, azurite, and other copper carbonates.[3] Chalconatronite has also been found and recorded in Australia, Germany, and Colorado.[7][8]
- ^ 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.
- ^ "Chalconatronite: Chalconatronite mineral information and data". www.mindat.org. Retrieved 2017-06-16.
- ^ a b Gettens, R. J.; Frondel, C. (1955). "Chalconatronite: An Alteration Product on Some Ancient Egyptian Bronzes". Studies in Conservation. 2 (2): 64–75. doi:10.2307/1504919. JSTOR 1504919.
- ^ Barthelmy, Dave. "Chalconatronite Mineral Data". www.webmineral.com. Retrieved 2017-06-16.
- ^ Cite error: The named reference
:0was invoked but never defined (see the help page). - ^ Franke, Walter; Mircea, Magda (2005-06-01). "Plutarch's Report on the Blue Patina of Bronze Statues at Delphi: A Scientific Explanation". Journal of the American Institute for Conservation. 44 (2): 103–116. doi:10.1179/019713605806082356. S2CID 192001746.
- ^ Cite error: The named reference
pigmentwas invoked but never defined (see the help page). - ^ "Deremo Mine (Deremo - Snyder Mine; Deremo Shafts; Snyder Shaft), Slick Rock District, San Miguel Co., Colorado, USA". www.mindat.org. Retrieved 2018-01-24.