Loparite-(Ce)

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Loparite-(Ce)
Specific gravity
4.60–4.89
Optical propertiesIsotropic, anomalously anisotropic
Refractive indexn = 2.26–2.38
References[4]

Loparite-(Ce) is a granular, brittle oxide mineral of the perovskite class. It is black to dark grey and may appear grey to white in reflected light on polished thin section with reddish brown internal reflections.[5] It has the chemical formula of (Ce,Na,Ca)(Ti,Nb)O3.[4] Nioboloparite is a variation of loparite-(Ce) containing niobium.[6]

Loparite occurs as a primary phase in nepheline syenite intrusions and pegmatites. It is also found replacing perovskite in carbonatites.[4]

Loparite was first described for an occurrence in the

Kola peninsula in northern Russia
.

Etymology

The term originates from the word Lopar, the (former) Russian name for the

Kola peninsula, and the cerium content.[4][5][6]

References

  1. S2CID 235729616
    .
  2. ^ a b Mitchell R H, Burns P C, Chakhmouradian A R (2000) The crystal structures of loparite-(Ce), The Canadian Mineralogist 38, 145-152.
  3. ^ Zubkova, N. V., Arakcheeva, A. V., Pushcharovskii, D. Y., Semenov, E. I., & Atencio, D. (2000). Crystal structure of loparite. Crystallography Reports, 45(2), 210-214.
  4. ^ a b c d "Loparite-(Ce)" (PDF). Mineral Handbook. Mineral Data Publishing. 2005. Retrieved 2008-07-19.
  5. ^ a b Loparite-(Ce) on Webmineral
  6. ^ a b Loparite-(Ce) on Mindat.org

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