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Alumoåkermanite

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About AlumoåkermaniteHide

Formula:
(Ca,Na)2(Al,Mg,Fe2+)(Si2O7)
Colour:
light brown
Lustre:
Vitreous
Hardness:
4½ - 5
Specific Gravity:
2.96
Crystal System:
Tetragonal
Member of:
Name:
For the mineral åkermanite and its aluminum content.
This page provides mineralogical data about Alumoåkermanite.


Classification of AlumoåkermaniteHide

Approved
Approval Year:
2008
9.BB.10

9 : SILICATES (Germanates)
B : Sorosilicates
B : Si2O7 groups, without non-tetrahedral anions; cations in tetrahedral [4] and greater coordination
55.4.1.5

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

Vitreous
Transparency:
Translucent
Colour:
light brown
Streak:
white
Hardness:
4½ - 5 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
none
Fracture:
Irregular/Uneven
Density:
2.96(2) g/cm3 (Measured)    3.00 g/cm3 (Calculated)

Optical Data of AlumoåkermaniteHide

Type:
Uniaxial (-)
RI values:
nω = 1.635() 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:
Moderate
Optical Extinction:
straight
Pleochroism:
Non-pleochroic

Chemical Properties of AlumoåkermaniteHide

Formula:
(Ca,Na)2(Al,Mg,Fe2+)(Si2O7)

Crystallography of AlumoåkermaniteHide

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

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.712 (13)
3.075 (25)
2.859 (100)
2.456 (32)
1.830 (12)
1.757 (19)
1.736 (13)
1.386 (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
Ferri-gehleniteCa2Fe3+AlSiO7
GehleniteCa2Al(AlSiO7)Tet. 4 2m : P4 21m
GugiaiteCa2Be(Si2O7)Tet.
HardystoniteCa2Zn(Si2O7)Tet. 4 2m : P4 21m
Hydroxylgugiaite(Ca,□)2(Si,Be)(Be,Si)2O5(OH)2Tet. 4 2m : P4 21m
OkayamaliteCa2B(BSiO7)Tet.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Cebollite2 photos of Alumoåkermanite associated with Cebollite on mindat.org.
Juanite2 photos of Alumoåkermanite associated with Juanite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.BB.10ÅkermaniteCa2Mg(Si2O7)Tet. 4 2m : P4 21m
9.BB.10CebolliteCa5Al2(SiO4)3(OH)4Orth.
9.BB.10GehleniteCa2Al(AlSiO7)Tet. 4 2m : P4 21m
9.BB.10GugiaiteCa2Be(Si2O7)Tet.
9.BB.10HardystoniteCa2Zn(Si2O7)Tet. 4 2m : P4 21m
9.BB.10Jeffreyite(Ca,Na)2(Be,Al)(Si2O7,HSi2O7)Orth.
9.BB.10OkayamaliteCa2B(BSiO7)Tet.
9.BB.15BaryliteBe2Ba(Si2O7)Orth.
9.BB.15Barylite-1OBe2Ba(Si2O7)Mon. m : Pm
9.BB.20AndrémeyeriteBaFe2+2(Si2O7)Mon.

Related Minerals - Dana Grouping (8th Ed.)Hide

55.4.1.1ÅkermaniteCa2Mg(Si2O7)Tet. 4 2m : P4 21m
55.4.1.2GehleniteCa2Al(AlSiO7)Tet. 4 2m : P4 21m
55.4.1.3MeliliteCa2(Al,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.
Cameroon
 
  • South-West Region
    • Buea
      • Cameroon Mt
Fitton, G.J., Hughes D.J. (1981): Strontian melilite in a nephelinite lava from Etinde, Cameroon, Mineralogical Magazine, Vol. 44, pp. 261-264
Germany
 
  • Rhineland-Palatinate
    • Daun
      • Üdersdorf
Blaß, G. & Kruijen, F. (2014): Die Neuigkeiten aus der Vulkaneifel (2/14). Mineralien-Welt 25 (5), 62-75 (in German).
    • Mayen
      • Ettringen
        • Bellerberg volcano
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).
Russia
 
  • Eastern-Siberian Region
    • Krasnoyarsk Krai
      • Maimecha and Kotui Rivers Basin
Pavel M. Kartashov data
Tanzania (TL)
 
  • Arusha Region
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
USA
 
  • Wyoming
    • Campbell Co.
      • Reno Junction
Gunnar Färber
Mineral and/or Locality  
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