Zirkelite

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Zirkelite
General
Category Oxide mineral
Formula
(repeating unit)
(Ti,Ca,Zr)O(2-x)
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[1]
Density 4.7

Zirkelite is an oxide mineral with 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[edit]

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

Occurrence[edit]

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.

References[edit]