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Mineralpedia Details for Tadzhikite-(Ce)

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Tadzhikite-(Ce)

Tadzhikite-(Ce)

Named for its type occurrence in Tajikistan, sometimes spelled Tadzhikistan as translated from Russian, Tadzhikite was originally thought to be yttrium dominant, but is, in fact, cerium dominant; however Tadzhikite can still be found to be called and labeled as Tadzhikite-(Y) instead of Tadzhikite-(Ce). Tadzhikite occurs at its type locality within replacement zones in pegmatitic dikes. It occurs in only four countries: Tajikistan, Italy, Norway, and Canada.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/tadzhikite-(Y).pdf

Formula
Ca4Ce3+2TiB4Si4O22(OH)2 
Crystal System
Monoclinic 
Cleavage
Distinct, None, None 
Luster
Vitreous (Glassy) 
Color
gray brown, reddish brown 
Streak
white 
Class
Monoclinic - Prismatic 
Hardness
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Tadzhikite-(Ce) from Vetrall, Vico Lake, Viterbo Province, Latium, Italy

Tadzhikite-(Ce)
            from Vetrall, Vico Lake, Viterbo Province, Latium, Italy Tiny reddish brown micro crystals in matrix. This Vico Lake volcanic complex is one of the great Italian mineral localities having 6 type localities and over 85 valid mineral occurences. It is rich in Cerium and other rare earth minerals as well as beryllium. Many of the minerals are not found elsewhere.
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