Mineralpedia Details for Stillwellite-(Ce)
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. Stillwellite is weakly radioactive.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/stillwellite-(Ce).pdf
- Formula
- CeBSiO5
- Crystal System
- Trigonal
- Crystal Habit
- Rhombohedral Crystals, Massive
- Cleavage
- Imperfect, None, None
- Luster
- Resinous
- Color
- red brown, pale pink
- Streak
- white
- Class
- Trigonal - Pyramidal
- Fracture
- Conchoidal
- Hardness
- 6.5
- WebMineral
- View Stillwellite-(Ce)
- Mindat
- View Stillwellite-(Ce)
Stillwellite-(Ce) from Vico Complex, Vetralla, Viterbo prov., Latium, Italy
Euhedral, superb, translucent pink crystals to 1mm.
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Stillwellite-(Ce) from Castellaccio di Petrignano, Vetralla, Vico Lake, Viterbo, Italy
Euhedral, superb, translucent pink crystals to 1mm.
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Stillwellite-(Ce) from Mary Kathleen mine, Cloncurry Shire, Queensland
Heavy brown chunk of massive Stillwellite from the type locality.
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Stillwellite-(Ce) from Dara-Pioz Glacier, Alayskiy Range, Tien Shan Mts, Tajikistan
A 6mm euhedral pinkish red crystal in matrix.
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