Zinc- and Y-group-bearing senaite from St Peters Dome, and new data on senaite from Dattas, Minas Gerais, Brazil
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Abstract
A Zn- and Y-group-bearing senaite, formulated as AM21O38 (Pb0.63Na0.46Ba0.11)Σ1.20(Ti14.64
Zn1.74
Y‒group REE0.70Mn0.38Nb0.20Sn0.03Zr0.03Th0.02)Σ20.9O38, a member of the crichtonite group, is a newly characterized phase associated with murataite at the St Peters Dome area, Colorado. The Zn- and Y-group-bearing senaite is uranium-free and nonmetamict, but otherwise is comparable to known senaites and davidites in X-ray diffraction pattern, symmetry, and structure. The REE distribution shows a strong dominance of Y and the Y-group REE which are present in M(1). Megascopically, the mineral is black, submetallic, and opaque; in polished section it appears to be white and moderately bright compared with murataite. Cleavage is absent but twinning on {52
0} is present.
Senaite and hitherto unreported zinc-bearing senaite from Dattas, Diamantina, Minas Gerais, Brazil, have the following respective structural formulas as determined by electron microprobe:
(Pb0.76Sr0.20La0.08Ce0.07Ba0.04)Σ1.15(Ti12.89
Mn0.88Y0.59Zn0.12Mg0.07Nb0.03Cr0.02Th0.02)Σ20.61O38
and
(Pb0.89Ba0.15Ce0.02Sr0.02)Σ1.08(Ti14.57
Zn1.76Na0.63Mn0.50Y0.28Nb0.14Mg0.04Cr0.02)Σ20.83O38
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Zinc- and Y-group-bearing senaite from St Peters Dome, and new data on senaite from Dattas, Minas Gerais, Brazil |
| Series title | Mineralogical Magazine |
| DOI | 10.1180/minmag.1984.048.346.13 |
| Volume | 48 |
| Issue | 346 |
| Year Published | 1984 |
| Language | English |
| Publisher | Cambridge University Press |
| Description | 10 p. |
| First page | 97 |
| Last page | 106 |
| Country | Brazil |
| Other Geospatial | Dattas, Minas Gerais |
| Google Analytic Metrics | Metrics page |