Loparite-(Ce) is a granular, brittle oxide mineral of the
perovskite
Perovskite (pronunciation: ) is a calcium titanium oxide mineral composed of calcium titanate (chemical formula ). Its name is also applied to the class of compounds which have the same type of crystal structure as (XIIA2+VIB4+X2−3), known as ...
class. It is black to dark grey and may appear grey to white in reflected light on polished
thin section
In optical mineralogy and petrography, a thin section (or petrographic thin section) is a thin slice of a rock or mineral sample, prepared in a laboratory, for use with a polarizing petrographic microscope, electron microscope and electron mic ...
with reddish brown internal reflections.
[Loparite-(Ce) o]
Webmineral
/ref> It has the chemical formula of .[ Nioboloparite is a variation of Loparite-(Ce) containing ]niobium
Niobium is a chemical element with chemical symbol Nb (formerly columbium, Cb) and atomic number 41. It is a light grey, crystalline, and ductile transition metal. Pure niobium has a Mohs hardness rating similar to pure titanium, and it has sim ...
.
Loparite occurs as a primary phase in nepheline syenite
Nepheline syenite is a holocrystalline plutonic rock that consists largely of nepheline and alkali feldspar. The rocks are mostly pale colored, grey or pink, and in general appearance they are not unlike granites, but dark green varieties are al ...
intrusions and pegmatite
A pegmatite is an igneous rock showing a very coarse texture, with large interlocking crystals usually greater in size than and sometimes greater than . Most pegmatites are composed of quartz, feldspar, and mica, having a similar silicic com ...
s. It is also found replacing perovskite
Perovskite (pronunciation: ) is a calcium titanium oxide mineral composed of calcium titanate (chemical formula ). Its name is also applied to the class of compounds which have the same type of crystal structure as (XIIA2+VIB4+X2−3), known as ...
in carbonatite
Carbonatite () is a type of intrusive rock, intrusive or extrusive rock, extrusive igneous rock defined by mineralogic composition consisting of greater than 50% carbonate minerals. Carbonatites may be confused with marble and may require geoche ...
s.[
Loparite was first described for an occurrence in the Khibiny and Lovozero massifs, ]Kola peninsula
sjd, Куэлнэгк нёа̄ррк
, image_name= Kola peninsula.png
, image_caption= Kola Peninsula as a part of Murmansk Oblast
, image_size= 300px
, image_alt=
, map_image= Murmansk in Russia.svg
, map_caption = Location of Murmansk Oblas ...
in northern Russia
Russia (, , ), or the Russian Federation, is a List of transcontinental countries, transcontinental country spanning Eastern Europe and North Asia, Northern Asia. It is the List of countries and dependencies by area, largest country in the ...
.
File:Loparite-crystal-structure-1.png ,
File:Loparite-crystal-structure-2.png ,
File:Loparite-crystal-structure-3.png ,
Etymology
The term originates from the word ''Lopar'', the (former) Russian name for the Sami
Acronyms
* SAMI, ''Synchronized Accessible Media Interchange'', a closed-captioning format developed by Microsoft
* Saudi Arabian Military Industries, a government-owned defence company
* South African Malaria Initiative, a virtual expertise net ...
indigenous inhabitants of the Kola peninsula
sjd, Куэлнэгк нёа̄ррк
, image_name= Kola peninsula.png
, image_caption= Kola Peninsula as a part of Murmansk Oblast
, image_size= 300px
, image_alt=
, map_image= Murmansk in Russia.svg
, map_caption = Location of Murmansk Oblas ...
, and the cerium
Cerium is a chemical element with the symbol Ce and atomic number 58. Cerium is a soft, ductile, and silvery-white metal that tarnishes when exposed to air. Cerium is the second element in the lanthanide series, and while it often shows the +3 o ...
content.[Loparite-(Ce) o]
Mindat.org
/ref>
References
External links
Webmineral
Oxide minerals
Sámi
{{oxide-mineral-stub