Loparite-(Ce) - Reference.org

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Category Oxide minerals

Formula (Ce,Na,Ca)(Ti,Nb)O3

IMA symbol Lop-Ce

Strunz classification 4.CC.35

Crystal system Loparit-(Ce)-Q: tetragonal
Loparit-(Ce)-O: orthorhombisch
Loparit-(Ce)-C: cubic

Color Black to grey-brown in thin section

Crystal habit Cubic and octahedral crystals and massive

Twinning Penetration twins common on

Cleavage Imperfect

Fracture Uneven

Tenacity Brittle

Mohs scale hardness 5.5–6.0

Luster Metallic to sub-metallic

Streak Reddish brown

Diaphaneity opaque, transparent in thin fragments

Specific gravity 4.60–4.89

Optical properties Isotropic, anomalously anisotropic

Refractive index n = 2.26–2.38

Additional information

Loparite-(Ce)

Oxide mineral

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.

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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.⁵ ⁶ ⁷

External links

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References

"Loparite-(Ce) Mineral Data". webmineral.com. Retrieved 2024-12-20. http://webmineral.com/data/Loparite-(Ce).shtml ↩
"Loparite-(Ce)" (PDF). Mineral Handbook. Mineral Data Publishing. 2005. Retrieved 2008-07-19. http://rruff.geo.arizona.edu/doclib/hom/loparitece.pdf ↩
"Loparite". www.mindat.org. Retrieved 2024-12-20. https://www.mindat.org/min-2432.html ↩
"Loparite-(Ce)" (PDF). Mineral Handbook. Mineral Data Publishing. 2005. Retrieved 2008-07-19. http://rruff.geo.arizona.edu/doclib/hom/loparitece.pdf ↩
"Loparite-(Ce)" (PDF). Mineral Handbook. Mineral Data Publishing. 2005. Retrieved 2008-07-19. http://rruff.geo.arizona.edu/doclib/hom/loparitece.pdf ↩
"Loparite-(Ce) Mineral Data". webmineral.com. Retrieved 2024-12-20. http://webmineral.com/data/Loparite-(Ce).shtml ↩
"Loparite". www.mindat.org. Retrieved 2024-12-20. https://www.mindat.org/min-2432.html ↩