| Reference Type | Journal (article/letter/editorial) |
|---|
| Title | A reinvestigation of holotype wadalite from Tadano, Fukushima Prefecture, Japan |
|---|
| Journal | Mineralogical Magazine |
|---|
| Authors | Banno, Yasuyuki | Author |
|---|
| Bunno, Michiaki | Author |
| Tsukimura, Katsuhiro | Author |
| Year | 2018 (October) | Volume | 82 |
|---|
| Issue | 5 |
|---|
| Publisher | Mineralogical Society |
|---|
| DOI | doi:10.1180/minmag.2017.081.086Search in ResearchGate |
|---|
| Generate Citation Formats |
|---|
| Mindat Ref. ID | 245080 | Long-form Identifier | mindat:1:5:245080:7 |
|---|
|
| GUID | 0 |
|---|
| Full Reference | Banno, Yasuyuki, Bunno, Michiaki, Tsukimura, Katsuhiro (2018) A reinvestigation of holotype wadalite from Tadano, Fukushima Prefecture, Japan. Mineralogical Magazine, 82 (5) 1023-1031 doi:10.1180/minmag.2017.081.086 |
|---|
| Plain Text | Banno, Yasuyuki, Bunno, Michiaki, Tsukimura, Katsuhiro (2018) A reinvestigation of holotype wadalite from Tadano, Fukushima Prefecture, Japan. Mineralogical Magazine, 82 (5) 1023-1031 doi:10.1180/minmag.2017.081.086 |
|---|
| Abstract/Notes | ABSTRACTA reinvestigation of the type specimen of wadalite, ideally Ca12Al10Si4O32Cl6, from Tadano, Fukushima Prefecture, Japan, reveals that it has well-defined chemical sector zoning. The mineral occurs in skarn xenoliths in two-pyroxene andesite and forms tris-tetrahedral crystals up to 1 mm in size. The mineral is cubic,I¯43d, witha= 12.009(2) Å,V= 1731.8(8) Å3andZ= 2. The zoning is divided into two sectors, {21¯1} and {211}, on the basis of back-scattered-electron images. The {21¯1} sector is more enriched in Fe3+, Si, Mg and Cl, and depleted in Al than the {211} sector. The empirical formulae yielded by the averaged compositions for the {21¯1} and {211} sectors are: Ca12.01(Al7.88$\hbox{Fe}_{{\rm 0}{\rm. 99}}^{{\rm 3 +}} $Si4.51Mg0.56Ti0.05)Σ13.99O32.22Cl5.55and Ca12.05(Al8.42$\hbox{Fe}_{{\rm 0}{\rm. 85}}^{{\rm 3 +}} $Si4.20Mg0.44Ti0.04)Σ13.95O32.19Cl5.38, respectively. Compositional variations in the wadalite grains suggest that the Si contents are controlled mainly by the substitutionT(Al,Fe3+) +W□ ↔TSi +W(Cl,F). The presence of sector zoning suggests that the wadalite grew during rapid non-equilibrium crystallization. |
|---|
These are possibly similar items as determined by title/reference text matching only.
