General Alumoakermanite Information![]() (Ca,Na)2(Al,Mg,Fe++)(Si2O7) |
![]() Molecular Weight = 268.84 gm |
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Sodium 4.28 % Na 5.76 % Na2O |
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Calcium 22.36 % Ca 31.29 % CaO |
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Magnesium 2.71 % Mg 4.50 % MgO |
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Aluminum 6.02 % Al 11.38 % Al2O3 |
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Iron 2.08 % Fe 2.67 % FeO |
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Silicon 20.89 % Si 44.70 % SiO2 |
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Oxygen 41.66 % O |
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100.00 % 100.30 % = TOTAL OXIDE |
![]() Ca1.5Na0.5Al0.6Mg0.3Fe2+0.1(Si2O7) |
![]() 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 åkermanite. |
![]() Proposed IMA 2008 (Dana # Added) |
![]() Oldoinyo Lengai volcano, Tanzania Link to MinDat.org Location Data. |
![]() Named as the Al analog of akermanite. |
![]() IMA2008-049 |
| | Search for Alumoakermanite Images
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| | Alumoakermanite Crystallography![]() a:c = 1:0.64764 |
![]() a = 7.7661, c = 5.0297, Z = 2; V = 303.35 Den(Calc)= 2.94 |
![]() Tetragonal - ScalenohedralH-M Symbol (4 2m) Space Group: P 421m |
![]() 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![]() Tabular - Form dimensions are thin in one direction. |
![]() 4-5 - Fluorite-Apatite |
| Optical Properties of Alumoakermanite![]() CI calc= -0.034 (Excellent) - where the CI = (1-KPDcalc/KC) |
KPDcalc= 0.2143,KC= 0.2072 Ncalc = 1.61 ![]() Uniaxial (-), e=1.624-1.626, w=1.635, bire=0.0090-0.0110. |
| Calculated Properties of Alumoakermanite![]() Bulk Density (Electron Density)=2.92 gm/cc |
note: Specific Gravity of Alumoakermanite =2.94 gm/cc. ![]() Fermion Index = 0.01 |
Boson Index = 0.99 ![]() PEAlumoakermanite = 4.46 barns/electron |
U=PEAlumoakermanite x rElectron Density= 13.03 barns/cc. ![]() GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Alumoakermanite is Not Radioactive | Alumoakermanite Classification![]() 55.04.01.05 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions |
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(55.04)with cations in [8] and lower coordination |
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(55.04.01)Melilite group |
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![]() 08.DE.35 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.D - Phosphates, etc |
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08.DE -With only medium-sized cations, (OH, etc.):RO4 = 3:1 |
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| Other Alumoakermanite Information![]() 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 Search for Alumoakermanite using: Visit our Advertisers for Alumoakermanite : A Bijoux Google Search for AlumoakermaniteAdam's Minerals Google Search for Alumoakermanite Cape Minerals Google Search for Alumoakermanite Dakota Matrix Minerals Google Search for Alumoakermanite Excalibur Mineral Corp. Google Search for Alumoakermanite Exceptional Minerals Google Search for Alumoakermanite John Betts Fine Minerals Search for Alumoakermanite McDougall Minerals Google Search for Alumoakermanite Mineral News Website Link Rock and Mineral Shows Google Search for Alumoakermanite Weinrich Minerals, Inc. Google Search for Alumoakermanite Ask about Alumoakermanite here : Print or Cut-and-Paste your Alumoakermanite Specimen Label here :
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