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

UM1998-//-BOSiO:AlFeMg[2]

This page is currently not sponsored. Click here to sponsor this page.
Formula:
(Fe2+,Mg)2Al14Si4B4O37
Originally thought to be the Fe-analogue of werdingite, but studies by Grew et al. (2010) showed that Fe is not dominant on any site; the Fe valency is not determined for all sites, however.

First reported from Almgjotheii, Flatestøl, Lund, Rogaland, Norway.


Hide all sections | Show all sections

Unique IdentifiersHide

Mindat ID:
7985
Long-form identifier:
mindat:1:1:7985:9

Similar NamesHide

UM1983-18-SiO:AlFeHMg~(Mg,Fe)Al4Si4O12(OH)8
UM1991-21-SiO:AlFeHMg(Fe,Al,Mg)6(Si,Al)4O10(OH)4 · H2O
UM1997-49-SiO:AlFeMgA synonym of JeffbeniteMg3Al2Si3O12
UM2002-52-SiO:AlFeMgMg4(Mg1.5Fe+20.3Fe+31.6Al8.5)O4[Si1.7Al10.3O36]
UM2011-20-SiO:AlFeMgNa0.06Ca0.02Mg0.71Fe0.20Al0.11Si0.94O3

Chemistry of UM1998-//-BOSiO:AlFeMg[2]Hide

Mindat Formula:
(Fe2+,Mg)2Al14Si4B4O37
Element Weights:
Element% weight
O47.856 %
Al30.537 %
Si9.082 %
Fe9.029 %
B3.496 %

Calculated from ideal end-member formula.
Elements listed:
Al, B, Fe, Mg, O, Si - search for minerals with similar chemistry

Synonyms of UM1998-//-BOSiO:AlFeMg[2]Hide

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 UM1998-//-BOSiO:AlFeMg[2]Hide

References for UM1998-//-BOSiO:AlFeMg[2]Hide

Localities for UM1998-//-BOSiO:AlFeMg[2]Hide

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.

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.
Madagascar
 
  • Anosy
    • Taolagnaro District
      • Andranobory
Grew et al. (1998)
Norway
 
  • Rogaland
    • Lund
      • Flatestøl
Grew et al. (1998)
Quick NavTopUnique IdentifiersSimilar NamesChemistry SynonymsOther InformationInternet Links References Localities Locality List
 
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 10:38:20 Page updated: January 4, 2026 19:39:25
Go to top of page