Mineralogy Database

Alumoakermanite Mineral Data

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General Alumoakermanite Information

Help on Chemical  Formula: Chemical Formula: (Ca,Na)2(Al,Mg,Fe++)(Si2O7)
Help on Composition: Composition: Molecular Weight = 268.84 gm
   Sodium      4.28 %  Na    5.76 % Na2O
   Calcium    22.36 %  Ca   31.29 % CaO
   Magnesium   2.71 %  Mg    4.50 % MgO
   Aluminum    6.02 %  Al   11.38 % Al2O3
   Iron        2.08 %  Fe    2.67 % FeO
   Silicon    20.89 %  Si   44.70 % SiO2
   Oxygen     41.66 %  O
             ______        ______ 
             100.00 %      100.30 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca1.5Na0.5Al0.6Mg0.3Fe2+0.1(Si2O7)
Help on Environment: Environment: Found in evolved olivine free melilite-nephelinitic ashes and lapilli-tuffs as a silicate phase in non-carbonatite lavas. Melilite group. Al-dominant analogue of �kermanite.
Help on IMA Status: IMA Status: Proposed IMA 2008 (Dana # Added)
Help on Locality: Locality: Oldoinyo Lengai volcano, Tanzania Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the Al analog of akermanite.
Help on Synonym: Synonym: IMA2008-049

Alumoakermanite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.64764
Help on Cell Dimensions: Cell Dimensions: a = 7.7661, c = 5.0297, Z = 2; V = 303.35 Den(Calc)= 2.94
Help on Crystal System: Crystal System: Tetragonal - Scalenohedral H-M Symbol (4 2m) Space Group: P 421m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.859(1), 2.456(0.32), 3.075(0.25),1.757(0.19), 1.386(0.13), 1.736(0.13), 3.712(0.13), 1.83(0.12),

Physical Properties of Alumoakermanite

Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite

Optical Properties of Alumoakermanite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2143,KC= 0.2072
Ncalc = 1.61
Help on Optical Data: Optical Data: Uniaxial (-), e=1.624-1.626, w=1.635, bire=0.0090-0.0110.

Calculated Properties of Alumoakermanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.92 gm/cc
note: Specific Gravity of Alumoakermanite =2.94 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEAlumoakermanite = 4.46 barns/electron
U=PEAlumoakermanite x rElectron Density= 13.03 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Alumoakermanite is Not Radioactive

Alumoakermanite Classification

Help on  Dana Class: Dana Class: (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions
  (55.04)with cations in [8] and lower coordination
  (55.04.01)Melilite group Akermanite Ca2MgSi2O7 P 421m 4 2m Gehlenite Ca2Al(AlSi)O7 P 421m 4 2m Melilite (Ca,Na)2(Al,Mg,Fe)(Si,Al)2O7 P 421m 4 2m Okayamalite! Ca2B2SiO7 P 421m 4 2m Alumoakermanite! (Ca,Na)2(Al,Mg,Fe)(Si2O7) P 421m 4 2m
Help on  Strunz Class: Strunz Class: 08.DE.35 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DE -With only medium-sized cations, (OH, etc.):RO4 = 3:1
08.DE.35 Aldermanite Mg5Al12(PO4)8(OH)22•32(H2O) Unk Ortho
08.DE.35 Alumoakermanite! (Ca,Na)2(Al,Mg,Fe)(Si2O7) P 421m 4 2m

Other Alumoakermanite Information

Help on See Also: See Also: Links to other databases for Alumoakermanite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 08.DE.35





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