Log InRegister
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreOur ScienceMindat Newsletter [Free Download]Contact Us
Donate to MindatSponsor a PageCorporate SponsorshipSponsored Pages
Learning CenterWhat Is a Mineral?The Most Common Minerals on EarthInformation for EducatorsMindat ArticlesMindat Newsletter [Free Download]The ElementsThe Mineral Quiz
Search FormMinerals by PropertiesMinerals by ChemistryMineral Visual ExplorerAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDMinerals by CountryAlphabetical Mineral IndexAlphabetical Locality SearchMineral Association SearchList of CountriesLocalities Near MePhoto SearchSearch ArticlesSearch GlossaryThe Rock H. Currier Digital LibraryMore Search Options
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
MineralsPetrologyFossilsMeteoritesGeologic Time
Mining CompaniesStatisticsMineral MuseumsClubs & OrganizationsMineral Shows & EventsDevice SettingsTime Machine
Read DiscussionsIdentification Request
Photo SearchPhoto GalleriesSearch by ColourPhoto Colour ExplorerNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography

Unnamed (Calcium Chromium Oxide Postspinel)

This page is currently not sponsored. Click here to sponsor this page.
Formula:
CaCr2O4
Crystal System:
Orthorhombic
Found in inclusions within lower-mantle diamond. Possibly the Cr analogue of harmunite.

Coexists with parascandolaite, 'Unnamed (Mg analogue of xieite)', 'ferropericlase', 'Unnamed (Orthorhombic Polymorph of Magnesium Oxide)', calcite, apatite group, spinel group, periclase, wÞstite, and probably nitrogen-bearing yarlongite.

Compare the compositionally similar chromatite.


Hide all sections | Show all sections

Unique IdentifiersHide

Mindat ID:
51711
Long-form identifier:
mindat:1:1:51711:7

Chemistry of Unnamed (Calcium Chromium Oxide Postspinel)Hide

Mindat Formula:
CaCr2O4
Element Weights:
Element% weight
Cr49.980 %
O30.758 %
Ca19.262 %

Calculated from ideal end-member formula.
Elements listed:
Ca, Cr, O - search for minerals with similar chemistry

Crystallography of Unnamed (Calcium Chromium Oxide Postspinel)Hide

Crystal System:
Orthorhombic

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for Unnamed (Calcium Chromium Oxide Postspinel)Hide

References for Unnamed (Calcium Chromium Oxide Postspinel)Hide

Localities for Unnamed (Calcium Chromium Oxide Postspinel)Hide

Showing 1 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Hide all sections | Show all sections

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Brazil
 
  • Mato Grosso
    • Juína
      • Sorriso river
Kaminsky et al. (2015)
Quick NavTopUnique IdentifiersChemistry Crystallography Other InformationInternet Links References Localities Locality List
 
and/or  
Mindat.orgÂŪ is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. MindatÂŪ and mindat.orgÂŪ are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, except where stated. Most political location boundaries are ÂĐ OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: October 19, 2026 23:38:41 Page updated: July 14, 2026 13:58:50
Go to top of page