Mineral formation from aqueous solution. Part III. The stability of aurichalcite, (Zn,Cu)5(CO3)2(OH)6, and rosasite (Cu,Zn)2(CO3)(OH)2 |
| |
| Authors: | Alwan K Alwan J H Thomas Peter A Williams |
| |
| Institution: | (1) Department of Chemistry, University College, P. O. Box 78, CF1 1XL Cardiff, Wales, UK |
| |
| Abstract: | Summary The stabilities of rosasite, (Cu, Zn)2 (CO3)(OH)2, and aurichalcite, (Zn, Cu)5(CO3)2(OH)6, have been determined by solution experiments with computer calculations of aqueous species in equilibrium with the solid phases.  G
f
o
values for rosasite and aurichalcite have been calculated as –1100 and –2766 kJ mol–1 respectively for specific samples of the two minerals. Most of the difference between the free energies of the compounds and those of malachite, Cu2(CO3)(OH)2, and hydrozincite, Zn5(CO3)2(OH)6 arises from substitution of the minor cation in the crystal lattice. Malachite, zincian malachite and rosasite should be considered as a single isomorphous series.Part II: A. K. Alwan and P. A. Williams,Transition Acct. Chem., 4, 319 (1979). |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
