Zirkelite

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Zirkelite
Oxide mineral
.mw-parser-output .template-chem2-su{display:inline-block;font-size:80%;line-height:1;vertical-align:-0.35em}.mw-parser-output .template-chem2-su>span{display:block;text-align:left}.mw-parser-output sub.template-chem2-sub{font-size:80%;vertical-align:-0.35em}.mw-parser-output sup.template-chem2-sup{font-size:80%;vertical-align:0.65em}(Ti,Ca,Zr)O(2−x)
Zke
4.DL.05
Isometric
Hexoctahedral (m3m) H-M symbol: (4/m 3 2/m)
a = 5.02 Å, Z = 4
Black, reddish brown
Crystalline, metamict, pseudocubic
None
Brittle
Resinous
Brownish grey
Subtranslucent to opaque
4.7
Radioactive

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.

Zirkelite was first discovered in Brazil in 1895. It was named for German petrographer Ferdinand Zirkel (1838–1912).

Initial discovery was from the Jacupiranga carbonatite, São Paulo, Brazil. It is also found in Canada, Kazakhstan, Norway, Russia, South Africa, the United Kingdom, and the United States.

• List of minerals named after people

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• Webmineral data
• Mindat localities
• Mineral Data Publishing

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