Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
Log InRegister
Quick Links : The Mindat ManualThe Rock H. Currier Digital LibraryMindat Newsletter [Free Download]
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsThe Rock H. Currier Digital LibraryGeologic TimeExplore Fossils
Minerals by PropertiesMinerals by ChemistryMineral Visual ExplorerAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsClubs & OrganizationsMineral Shows & EventsThe Mindat DirectoryDevice SettingsThe Mineral QuizTime Machine
Photo SearchPhoto GalleriesSearch by ColorPhoto Colour ExplorerNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography

Roymillerite from
Kombat Mine, Kombat, Otavi Constituency, Otjozondjupa Region, Namibia


00050800017364608147755.jpg
Roymillerite, etc.

Kombat Mine, Kombat, Otavi Constituency, Otjozondjupa Region, Namibia
00050800017364608147755.jpg
Roymillerite, etc.

Kombat Mine, Kombat, Otavi Constituency, Otjozondjupa Region, Namibia
04876030017272472886658.jpg
Roymillerite, etc.

Kombat Mine, Kombat, Otavi Constituency, Otjozondjupa Region, Namibia
Locality type:Mine
Classification
Species:Roymillerite
Formula:Pb24Mg9(Si10O28)(CO3)10(BO3)(SiO4)(OH)13O5
Chemical Analyses:
Oxide wt%:
1
MgO4.93 %
MnO1.24 %
FeO0.95 %
PbO75.38 %
B2O30.50 %
Al2O30.74 %
CO25.83 %
SiO27.90 %
H2O1.80 %
Total:99.27 %
Empirical formulas:
1Pb24.12Mg8.74Mn1.25Fe0.94B1.03Al1.04C9.46Si9.39H14.27O83
Sample references:
1Type Specimen
Chukanov, Nikita V., Jonsson, Erik, Aksenov, Sergey M., Britvin, Sergey N., Rastsvetaeva, Ramiza K., Belakovskiy, Dmitriy I., Van, Konstantin V. (2017) Roymillerite, Pb24Mg9(Si9AlO28)(SiO4)(BO3)(CO3)10(OH)14O4, a new mineral: mineralogical characterization and crystal chemistry. Physics and Chemistry of Minerals, 44 (10) 685-699 doi:10.1007/s00269-017-0893-2
Confirmation
Validity:Valid - Type Locality
Associated Minerals Based on Photo Data:
Rhodochrosite1
Cerussite1
Jacobsite1
Data
Mineral Data:Click here to view Roymillerite data
Locality Data:Click here to view Kombat Mine, Kombat, Otavi Constituency, Otjozondjupa Region, Namibia
Data Identifiers
Mindat Occurrence Record ID:1016547
Long-form Identifier:1:3:1016547:6
GUID (UUID V4):0
References
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2016) New minerals and nomenclature modifications approved in 2016, CNMNC Newsletter No. 33. Mineralogical Magazine, 80 (6) 1135-1144 doi:10.1180/minmag.2016.080.085
Chukanov, Nikita V., Jonsson, Erik, Aksenov, Sergey M., Britvin, Sergey N., Rastsvetaeva, Ramiza K., Belakovskiy, Dmitriy I., Van, Konstantin V. (2017) Roymillerite, Pb24Mg9(Si9AlO28)(SiO4)(BO3)(CO3)10(OH)14O4, a new mineral: mineralogical characterization and crystal chemistry. Physics and Chemistry of Minerals, 44 (10) 685-699 doi:10.1007/s00269-017-0893-2
 
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: September 3, 2026 13:19:56
Go to top of page