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Mineralpedia Details for Stillwellite-(Ce)

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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 
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Stillwellite-(Ce) from Vico Complex, Vetralla, Viterbo prov., Latium, Italy

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

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

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

Stillwellite-(Ce)
            from Dara-Pioz Glacier, Alayskiy Range, Tien Shan Mts, Tajikistan

A 6mm euhedral pinkish red crystal in matrix.

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