Zirkelite Knowpia

Zirkelite
Zirkelite
General
Category	Oxide mineral
Formula; (repeating unit)	(Ti,Ca,Zr)O(2−x)
IMA symbol	Zke
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
Density	4.7
Other characteristics	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.

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

^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
^ "Zirkelite Mineral Data".

Webmineral data
Mindat localities
Mineral Data Publishing

[1] Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.

[2] "Zirkelite Mineral Data".

[1]

[2]

Summary

Name and discovery edit

Occurrence edit

See also edit

References edit