Stillwellite-(Ce)
| Stillwellite-(Ce) | |
|---|---|
Radioactive | |
| References | [2][3][4] |
Stillwellite-(Ce) is a
rare-earth boro-silicate mineral
with chemical formula (Ce,La,Ca)BSiO5.
Location
It occurs as a metasomatic replacement of metamorphosed limestones in the Mary Kathleen mine, Australia and in alkalic pegmatites associated with syenite in an alkaline massif in Tajikistan.[2] It occurs in association with allanite, garnet, uraninite in the Australian deposit; with calcite, monazite,
Wilberforce, Ontario, Canada; and with pyrochlore, tienshanite, sogdianite, thorite, caesium kupletskite, reedmergnerite, steacyite, pectolite and quartz in the Tajikistan deposit.[2] It has also been reported from Mont Saint-Hilaire, Quebec, Canada and from Mineville, Essex County, New York. Other occurrences include the Inagli massif, Yakutia, Russia
,
around Langesundsfjord, Norway, in the Ilimaussaq intrusive complex, southern Greenland and the Vico volcano, Lazio, Italy.[2]
Discovery
It was first described in 1955 for an occurrence at the
Chemistry Breakdown
| (1) | (2) | (1) | (2) | |||
|---|---|---|---|---|---|---|
SiO2 |
22.40 | 22.06 | La2O3 | 27.95 | 19.12 | |
| UO2 | 0.22 | Ce2O3 | 33.15 | 30.82 | ||
| ThO2 | 5.41 | Pr2O3 | 1.82 | |||
| B2O3 | 12.23 | [13.46] | Nd2O3 | 5.36 | ||
| Al2O3 | 0.42 | Sm2O3 | 0.34 | |||
| Y2O3 | 0.74 | 0.28 | Fe2O3 | 0.18 |
References
- S2CID 235729616.
- ^ a b c d http://rruff.geo.arizona.edu/doclib/hom/stillwellitece.pdf Handbook of Mineralogy
- ^ a b http://webmineral.com/data/Stillwellite-(Ce).shtml Webmineral data
- ^ a b http://www.mindat.org/min-3788.html Mindat.org
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