SUPPORT US. Covid-19 has significantly affected our fundraising. Please help!
Log InRegister
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 ElementsBooks & Magazines
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice SettingsThe Mineral Quiz
Photo SearchPhoto GalleriesSearch by ColorNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryMineral Photography


This page is currently not sponsored. Click here to sponsor this page.
Hide all sections | Show all sections

About AlumoåkermaniteHide

light brown
4½ - 5
Specific Gravity:
Crystal System:
Member of:
For the mineral åkermanite and its aluminum content.
This page provides mineralogical data about Alumoåkermanite.

Classification of AlumoåkermaniteHide

Approval year:

9 : SILICATES (Germanates)
B : Sorosilicates
B : Si2O7 groups, without non-tetrahedral anions; cations in tetrahedral [4] and greater coordination

55 : SOROSILICATES Si2O7 Groups,Generally with no Additional Anions
4 : Si2O7 Groups, Generally with No Additional Anions with cations in [8] and lower coordination

Physical Properties of AlumoåkermaniteHide

light brown
4½ - 5 on Mohs scale
None Observed
2.96(2) g/cm3 (Measured)    3.00 g/cm3 (Calculated)

Optical Data of AlumoåkermaniteHide

Uniaxial (-)
RI values:
nω = 1.635(1) nε = 1.625(2)
Max Birefringence:
δ = 0.010
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Optical Extinction:

Chemical Properties of AlumoåkermaniteHide


Crystallography of AlumoåkermaniteHide

Crystal System:
Class (H-M):
4 2m - Scalenohedral
Space Group:
P4 21m
Cell Parameters:
a = 7.766(4) Å, c = 5.0297(4) Å
a:c = 1 : 0.648
Unit Cell V:
303.35 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
3.712 Å(13)
3.075 Å(25)
2.859 Å(100)
2.456 Å(32)
1.830 Å(12)
1.757 Å(19)
1.736 Å(13)
1.386 Å(13)

Type Occurrence of AlumoåkermaniteHide

General Appearance of Type Material:
tabular phenocrysts (up to 1.5 mm) and microphenocrysts in a fine-grained groundmass
Geological Setting of Type Material:
olivine-free melilite-nephelinitic ashes and lapilli-tuff
Associated Minerals at Type Locality:

Synonyms of AlumoåkermaniteHide

Other Language Names for AlumoåkermaniteHide

Relationship of Alumoåkermanite to other SpeciesHide

Member of:
Other Members of this group:
ÅkermaniteCa2Mg(Si2O7)Tet. 4 2m : P4 21m
BennesheriteBa2Fe2+Si2O7Tet. 4 2m : P4 21m
GehleniteCa2Al(AlSiO7)Tet. 4 2m : P4 21m
HardystoniteCa2Zn(Si2O7)Tet. 4 2m : P4 21m
Hydroxylgugiaite(Ca,◻)2(Be,Si)[(Si,Be)2O5(OH)2]Tet. 4 2m : P4 21m

Common AssociatesHide

Associated Minerals Based on Photo Data:
2 photos of Alumoåkermanite associated with CebolliteCa5Al2(SiO4)3(OH)4
2 photos of Alumoåkermanite associated with JuaniteCa10Mg4Al2Si11O39 · 4H2O or near

Related Minerals - Nickel-Strunz GroupingHide

9.BB.10ÅkermaniteCa2Mg(Si2O7)Tet. 4 2m : P4 21m
9.BB.10GehleniteCa2Al(AlSiO7)Tet. 4 2m : P4 21m
9.BB.10HardystoniteCa2Zn(Si2O7)Tet. 4 2m : P4 21m
9.BB.15Barylite-1OBe2Ba(Si2O7)Mon. m : Pm

Related Minerals - Dana Grouping (8th Ed.)HideÅkermaniteCa2Mg(Si2O7)Tet. 4 2m : P4 21m 4 2m : P4 21m,Mg,Fe)((Al,Si,B)SiO7)Tet.

Fluorescence of AlumoåkermaniteHide

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.

References for AlumoåkermaniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Louisnathan, J. (1970): The crystal structure of synthetic soda melilite, CaNaAISi207, Zeitschrift für Kristallographie, Vol. 131, p. 314 - 321
Fitton, G.J., Hughes D.J. (1981): Strontian melilite in a nephelinite lava from Etinde, Cameroon, Mineralogical Magazine, Vol. 44, pp. 261-264
Bindi, L., Bonazzi, P., Fitton, G.J. (2001): Crystal chemistry of strontian soda melilite from nephelinite lava of Mt. Etinde, Cameroon, European Journal of Mineralogy; February 2001; Vol. 13; p. 121-125
Wiedenmann, D., Zaitsev A.N., Britvin S.N., Krivovichev, S.V., Keller, J. (2009): Alumoåkermanite, (Ca,Na)2(Al,Mg,Fe2+)(Si2O7), a new mineral from the active carbonatite-nephelinite-phonolite volcano Oldoinyo Lengai, northern Tanzania. Mineralogical Magazine, 73, 373-384.

Internet Links for AlumoåkermaniteHide

Localities for AlumoåkermaniteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Southwest Region
    • Fako
      • Buea
Fitton, G.J., Hughes D.J. (1981): Strontian melilite in a nephelinite lava from Etinde, Cameroon, Mineralogical Magazine, Vol. 44, pp. 261-264
  • Occitanie
    • Aveyron
      • Rodez
        • Sévérac-d'Aveyron
Boisson,J-M.,Leconte,J. (2019) Analyses 2018 MNHN-Micromonteurs. La Revue des Micromonteurs 30, 3-31.
  • Rhineland-Palatinate
    • Mayen-Koblenz District
      • Vordereifel
        • Ettringen
EMPA data V. V. SHARYGIN (Novosibirsk, Ru)
Sharygin, V. V. (2012). Mineralogy of metacarbonate xenolith from alkali basalt, E. Eifel, Germany. In Ore Potential of Alkaline, Kimberlite and Carbonatite Magmatism. Book of Abstracts, XXIX International Conference. Training Program: Alkaline Magmatism of the Earth, Sudak-Moscow, ONTI GEOCHI RAS (pp. 156-158).
    • Vulkaneifel District
      • Daun
        • Üdersdorf
Blaß, G. & Kruijen, F. (2014): Die Neuigkeiten aus der Vulkaneifel (2/14). Mineralien-Welt 25 (5), 62-75 (in German).
  • Krasnoyarsk Krai
    • Maimecha and Kotui Rivers Basin
Pavel M. Kartashov data
Tanzania (TL)
  • Arusha region
    • Ngorongoro District
Wiedenmann, D., Zaitsev A.N., Britvin S.N., Krivovichev, S.V., Keller, J. (2009): Alumoåkermanite, (Ca,Na)2(Al,Mg,Fe2+)(Si2O7), a new mineral from the active carbonatite-nephelinite-phonolite volcano Oldoinyo Lengai, northern Tanzania. Mineralogical Magazine, 73, 373-384.; Mattsson, H. B., & Reusser, E. (2010). Mineralogical and geochemical characterization of ashes from an early phase of the explosive September 2007 eruption of Oldoinyo Lengai (Tanzania). Journal of African Earth Sciences, 58(5), 752-763.; Victoria Sekisova, Victor Victorovich Sharygin, A. N. Zaitsev, Stanislav Strekopytov (2015) Liquid Immiscibility Геология и геофизика, 2015, т. 56, № 12, с. 2173—2197
  • Wyoming
    • Campbell Co.
      • Reno Junction
Gunnar Färber
Mineral and/or Locality  
Mindat Discussions Facebook Logo Instagram Logo Discord Logo is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © and the Hudson Institute of Mineralogy 1993-2020, except where stated. Most political location boundaries are © OpenStreetMap contributors. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: November 30, 2020 21:24:11 Page generated: November 30, 2020 08:18:09
Go to top of page