loparite-(Ce)

{{Short description|Oxide mineral}}

{{Infobox mineral

| name = Loparite-(Ce)

| category = Oxide minerals

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| image = Loparite-(Ce)-41714.jpg

| imagesize = 260px

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| formula = {{chem2|(Ce,Na,Ca)(Ti,Nb)O3}}

| IMAsymbol = Lop-Ce{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|url=https://www.cambridge.org/core/journals/mineralogical-magazine/article/imacnmnc-approved-mineral-symbols/62311F45ED37831D78603C6E6B25EE0A|journal=Mineralogical Magazine|volume=85|issue=3 |pages=291–320|doi=10.1180/mgm.2021.43 |bibcode=2021MinM...85..291W |s2cid=235729616 |doi-access=free}}

| molweight =

| strunz = 4.CC.35

| color = Black to grey-brown in thin section

| habit = Cubic and octahedral crystals and massive

| system = Loparit-(Ce)-Q: tetragonalMitchell R H, Burns P C, Chakhmouradian A R (2000) The crystal structures of loparite-(Ce), The Canadian Mineralogist 38, 145-152.
Loparit-(Ce)-O: orthorhombisch
Loparit-(Ce)-C: cubicZubkova, N. V., Arakcheeva, A. V., Pushcharovskii, D. Y., Semenov, E. I., & Atencio, D. (2000). Crystal structure of loparite. Crystallography Reports, 45(2), 210-214.

| twinning = Penetration twins common on [111]

| cleavage = [100] Imperfect

| fracture = Uneven

| tenacity = Brittle

| mohs = 5.5–6.0

| luster = Metallic to sub-metallic

| polish =

| refractive = n = 2.26–2.38

| opticalprop = Isotropic, anomalously anisotropic

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| streak = Reddish brown

| gravity = 4.60–4.89

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| diaphaneity = opaque, transparent in thin fragments

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| references = {{cite web|url=http://rruff.geo.arizona.edu/doclib/hom/loparitece.pdf|title=Loparite-(Ce)|date=2005|work=Mineral Handbook|publisher=Mineral Data Publishing|accessdate=2008-07-19}}

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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.{{Cite web |title=Loparite-(Ce) Mineral Data |url=http://webmineral.com/data/Loparite-(Ce).shtml |access-date=2024-12-20 |website=webmineral.com}} It has the chemical formula of {{chem2|(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.

File:Loparite-crystal-structure-1.png |

File:Loparite-crystal-structure-2.png |

File:Loparite-crystal-structure-3.png |