Category Silicate mineral group Space group R3c | Crystal system Trigonal | |
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Formula
(repeating unit) (Ce,La,Ca)9(Mg,Fe)(SiO4)6(SiO3OH)(OH)3 Crystal class Ditrigonal pyramidal (3m)
(same H-M symbol) Color Clove-brown with a reddish tinge; pale lavender-brown to colorless in thin fragments | ||
Cerite lawak
Cerite is a complex silicate mineral group containing cerium, formula (Ce,La,Ca)9(Mg,Fe+3)(SiO4)6(SiO3OH)(OH)3. The cerium and lanthanum content varies with the Ce rich species (cerite-(Ce)) and the La rich species (cerite-(La)). Analysis of a sample from the Mountain Pass carbonatite gave 35.05% Ce2O3 and 30.04% La2O3.
Cerite was first described in 1803 for an occurrence in Bastnäs in Västmanland, Sweden. The lanthanum rich species, cerite-(La) was first described for an occurrence in the Khibina massif, Kola Peninsula, Russia in 2002.
References
Cerite Wikipedia(Text) CC BY-SA