| Reference Type | Journal (article/letter/editorial) |
|---|
| Title | The crystal structures, solid solutions and infrared spectra of copiapite-group minerals |
|---|
| Journal | Mineralogical Magazine |
|---|
| Authors | Majzlan, J. | Author |
|---|
| Michallik, R. | Author |
| Majzlan, J. | Author |
| Michallik, R. | Author |
| Year | 2007 (October) | Volume | 71 |
|---|
| Page(s) | 553-569 | Issue | 5 |
|---|
| Publisher | Mineralogical Society |
|---|
| Download URL | http://rruff.info/uploads/MM71_553.pdf+ |
|---|
| DOI | doi:10.1180/minmag.2007.071.5.553Search in ResearchGate |
|---|
| Generate Citation Formats |
|---|
| Classification | Not set | LoC | Not set |
|---|
| Mindat Ref. ID | 243776 | Long-form Identifier | mindat:1:5:243776:1 |
|---|
|
| GUID | 0 |
|---|
| Full Reference | Majzlan, J., Michallik, R. (2007) The crystal structures, solid solutions and infrared spectra of copiapite-group minerals. Mineralogical Magazine, 71 (5) 553-569 doi:10.1180/minmag.2007.071.5.553 |
|---|
| Plain Text | Majzlan, J., Michallik, R. (2007) The crystal structures, solid solutions and infrared spectra of copiapite-group minerals. Mineralogical Magazine, 71 (5) 553-569 doi:10.1180/minmag.2007.071.5.553 |
|---|
| Abstract/Notes | AbstractCopiapite is a mineral of iron- and sulphate-rich acidic environments and has a general formula AFe3+4 (SO4)6(OH)2(H2O)20, where A = Fe2+, 2/3Fe3+, 2/3Al3+, Mg, Zn. The structure is built by infinite tetrahedral-octahedral chains and isolated octahedrally coordinated A sites. Our synthetic and natural copiapite samples can be divided into two large groups based on the orientation of the structural fragments. One group comprises copiapite phases where A = Al3+, Fe2+ or Fe3+ and we designate it as the structural type AL. The other group consists of copiapite with A = Mg2+, Zn2+ or Ni2+ and this is the structural type MG. The solid-solution series between Fe3+ and Al3+ copiapite is continuous. The series between Mg2+-Al3+, Mg2+-Fe3+ and Mg2+-Al3+-Fe3+ copiapite are not continuous; the samples with intermediate compositions contain two copiapite phases, one of the type AL and one of the type MG. The series between Mg2+ and Zn2+ copiapite is continuous only at 25°C. At 75°C, the Zn-rich portion of this systemcrystallizes a copiapite-like phase whose structure may be a superstructure of copiapite. The series between Al-Fe2+ and Mg-Fe2+ copiapite are not continuous and show complex behaviour of the intermediate compositions. |
|---|
These are possibly similar items as determined by title/reference text matching only.
