Kolitsch, U., Holtstam, D. (2002) Barysilite from Garpenberg Norra, Dalarna, Sweden: occurrence and crystal structure refinement. Mineralogical Magazine, 66 (2) 353-363 doi:10.1180/0026461026620034
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Barysilite from Garpenberg Norra, Dalarna, Sweden: occurrence and crystal structure refinement | ||
| Journal | Mineralogical Magazine | ||
| Authors | Kolitsch, U. | Author | |
| Holtstam, D. | Author | ||
| Year | 2002 (April) | Volume | 66 |
| Page(s) | 353-363 | Issue | 2 |
| Publisher | Mineralogical Society | ||
| Download URL | https://rruff.info/rruff_1.0/uploads/MM66_353.pdf+ | ||
| DOI | doi:10.1180/0026461026620034Search in ResearchGate | ||
| Classification | Not set | LoC | Not set |
| Mindat Ref. ID | 243349 | Long-form Identifier | mindat:1:5:243349:7 |
| GUID | 3b54bc06-850d-4662-9668-dbc9ef4c11a1 | ||
| Full Reference | Kolitsch, U., Holtstam, D. (2002) Barysilite from Garpenberg Norra, Dalarna, Sweden: occurrence and crystal structure refinement. Mineralogical Magazine, 66 (2) 353-363 doi:10.1180/0026461026620034 | ||
| Plain Text | Kolitsch, U., Holtstam, D. (2002) Barysilite from Garpenberg Norra, Dalarna, Sweden: occurrence and crystal structure refinement. Mineralogical Magazine, 66 (2) 353-363 doi:10.1180/0026461026620034 | ||
| Abstract/Notes | A new occurrence of barysilite, Pb8Mn(Si2O7)3, at the polymetallic Garpenberg Norra Zn-Pb deposit, Hedemora, Dalarna, Sweden, is described. The mineral, which forms colourless, transparent grains, is characterized by X-ray diffraction and electron-microprobe analyses. The assemblage includes tephroite, zincian jacobsite, manganoan diopside and others. The crystal structure of a barysilite crystal from Garpenberg Norra was redetermined using single-crystal X-ray diffraction data (Mo-Kα, CCD area detector) and has been refined in space group R3̄c with a = 9.804(1), c = 38.416(8)Å, V = 3197.8(8)Å3, to R1 = 2.32% for 1025 ‘observed’ reflections with Fo >4σ(Fo). A previous, low-precision structure determination (Lajzérowicz, 1965; R = 20%) is confirmed but improved considerably. The structure contains one distorted MnO6 polyhedron with six equivalent Mn–O bonds (2.224 Å), one Si2O7 disilicate unit with an Si–O–Si angle of 120.9°, and two non-equivalent Pb sites. The Pb1 site has a highly irregular, one-sided coordination with six O ligands, indicating a stereoactive 6s2 lone-electron pair on the Pb2+ ion, whereas the [6+3]-coordinated Pb2 site is fairly regular, with Pb–O distances of 2.540 (3×), 2.674 (3×) and 3.098 (3×) Å. The Pb2 site contains ~10% of Ca (+Ba) replacing Pb, corresponding to the structural formula Pb16(Pb,Ca)22Mn(Si2O7)3. This is the first direct proof that not only the M site in barysilite-type Pb8M(Si2O7)3 compounds can be replaced by divalent cations. | ||
Map of Localities
Locality Pages
| Locality | Citation Details |
|---|---|
| Garpenberg Norra Mine, Garpenberg, Hedemora, Dalarna County, Sweden |
Mineral Pages
| Mineral | Citation Details |
|---|---|
| Barysilite |
Mineral Occurrences
| Locality | Mineral(s) |
|---|---|
| Garpenberg Norra Mine, Garpenberg, Hedemora, Dalarna County, Sweden | ⓘ Barysilite |
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