Zirkelite
(Ti,Ca,Zr)O(2−x)IMA symbol Zke[1] Strunz classification 4.DL.05 Crystal system Isometric Crystal class Hexoctahedral (m3m)
H-M symbol: (4/m 3 2/m) Unit cell a = 5.02 Å, Z = 4 Identification Color Black, reddish brown Crystal habit Crystalline, metamict, pseudocubic Cleavage None Fracture Brittle Luster Resinous Streak Brownish grey Diaphaneity Subtranslucent to opaque[2] Density 4.7 Other characteristics Radioactive Oxide minerals
Silicate minerals Other
H-M symbol: (4/m 3 2/m)
Zirkelite is an oxide mineral with the chemical formula (Ca,Th,Ce)Zr(Ti,Nb)2O7. It occurs as well-formed fine sized isometric crystals. It is a black, brown or yellow mineral with a hardness of 5.5 and a specific gravity of 4.7.
Name and discovery
Zirkelite was first discovered in Brazil in 1895. It was named for German petrographer Ferdinand Zirkel (1838–1912).
Occurrence
Initial discovery was from the Jacupiranga carbonatite, Sao Paulo, Brazil. It is also found in Canada, Kazakhstan, Norway, Russia, South Africa, the United Kingdom, and the United States.
See also
References
- Webmineral data
- Mindat localities
- Mineral Data Publishing
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