Stillwellite-(Ce) is a rare-earth boro-silicate mineral with formula: (Ce,La,Ca)BSiO 5. 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.
Stillwellite-(Ce) Comments: Brownish red euhedral crystal of stillwellite-(Ce) in matrix under halogen or sunlight lighting. Inset image shows the yellow color-change under fluorescent lighting.
Stillwellite-(Ce) mineral data, information about Stillwellite-(Ce), its properties and worldwide locations. SUPPORT US . If mindat.org is important to you, click here to donate to our Fall 2019 fundraiser!
(Ce,La,Th,Ca)BSiO Stillwellite-(Ce) is a rare mineral at MSH. It is difficult to recognize because of its crystal size and color
Stillwellite-(Ce) (Ce; La; Ca)BSiO5 °c 2001 Mineral Data Publishing, version 1.2 Crystal Data: Hexagonal. Point Group: 3: As °at rhombohedral crystals, to 4 cm, and massive. Twinning: Observed about .
Stillwellite-(Ce) is a rare REE borosilicate and some of the best crystals of the species originate from the rugged mountains of Tajikistan. This is one of the better crystals collected from a remarkable pocket in September of 2004.
Stillwellite-(Ce) Named after Dr. Frank Leslie Stillwell, an Australian ore mineralogist. Occuring in few localities, Stillwellite can be found as a replacement mineral of metamorphosed calcium-rich sediments and in alkalic pegmatites in syenite.
REFERENCES for Stillwellite-(Ce) American Mineralogist Crystal Structure Database Record: [view record] Anthony J W, Bideaux R A, Bladh K W, and Nichols M C (1990) Handbook of Mineralogy, Mineral Data Publishing, Tucson Arizona, USA, by permission of the Mineralogical Society of America.
Media in category "Stillwellite-(Ce)" The following 2 files are in this category, out of 2 total.
(*)Data are not exhaustive and are limited to the most important localities for fluorescence Bibliographical Reference for luminescence: Luminescent Spectra of Minerals, Boris S. Gorobets and Alexandre A. Rogojine, Moscow, 2002 ,