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
Minerals 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

Orthopyroxene Subgroup from
Ianakafy (Inanakafy), Ianakafy, Betroka District, Anosy, Madagascar


Locality type:Village
Classification
Species:'Orthopyroxene Subgroup' (not an IMA approved species)
Chemical Analyses:
Oxide wt%:
1
SiO253.39 %
Al2O35.44 %
Fe2O31.51 %
FeO8.41 %
MnO0.12 %
MgO30.86 %
TiO20.10 %
Na2O0.06 %
H2O+0.30 %
H2O-0.04 %
Total:100.23 %
Sample references:
1 -
v. Knorring, O., Sahama, Th.G., Lehtinen, M. (1969) Kornerupine-bearing gneiss from Inanakafy near Betroka, Madagascar. Bulletin of the Geological Society of Finland, 41. 79-84 doi:10.17741/bgsf/41.008
Comments:The mineral represents a bronzite with (Fe, Mn): Mg = 15:85 and with Al largely substituting for Si.
Habit:euhedral to subhedral crystals characterized by the pyramidal faces {211}. Faces {101} not visible.
Colour:brownish
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Orthopyroxene Subgroup data
Locality Data:Click here to view Ianakafy (Inanakafy), Ianakafy, Betroka District, Anosy, Madagascar
Data Identifiers
Mindat Occurrence Record ID:367040
Long-form Identifier:1:3:367040:8
GUID (UUID V4):0
Nearest other occurrences of Orthopyroxene Subgroup
68.7km (42.7 miles) ⓘAnkafotia, Fotadrevo Commune, Ampanihy District, Atsimo-Andrefana, Madagascar
References
v. Knorring, O., Sahama, Th.G., Lehtinen, M. (1969) Kornerupine-bearing gneiss from Inanakafy near Betroka, Madagascar. Bulletin of the Geological Society of Finland, 41. 79-84 doi:10.17741/bgsf/41.008
 
and/or  
Mindat.org® is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® 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 © 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 14, 2026 03:38:19
Go to top of page