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Loparite-(Ce)

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Oxide mineral
Loparite-(Ce)
General
CategoryOxide minerals
Formula
(repeating unit)		(Ce,Na,Ca)(Ti,Nb)O3
IMA symbolLop-Ce
Strunz classification4.CC.35
Crystal systemLoparit-(Ce)-Q: tetragonal
Loparit-(Ce)-O: orthorhombisch
Loparit-(Ce)-C: cubic
Identification
ColorBlack to grey-brown in thin section
Crystal habitCubic and octahedral crystals and massive
TwinningPenetration twins common on
Cleavage Imperfect
FractureUneven
TenacityBrittle
Mohs scale hardness5.5–6.0
LusterMetallic to sub-metallic
StreakReddish brown
Diaphaneityopaque, transparent in thin fragments
Specific gravity4.60–4.89
Optical propertiesIsotropic, anomalously anisotropic
Refractive indexn = 2.26–2.38
References

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. It has the chemical formula of (Ce,Na,Ca)(Ti,Nb)O3. Nioboloparite is a variation of loparite-(Ce) containing niobium.

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

Loparite was first described for an occurrence in the Khibiny and Lovozero massifs, Kola peninsula in northern Russia.

  • Crystal structures of loparite

Etymology

The term originates from the word Lopar, the former Russian name for the Sami indigenous inhabitants of the Kola peninsula, and the cerium content.

References

  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. ^ 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. ^ "Loparite-(Ce)" (PDF). Mineral Handbook. Mineral Data Publishing. 2005. Retrieved 2008-07-19.
  5. ^ "Loparite-(Ce) Mineral Data". webmineral.com. Retrieved 2024-12-20.
  6. ^ "Loparite". www.mindat.org. Retrieved 2024-12-20.

External links


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