Mineralogy Database

Andremeyerite Mineral Data

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General Andremeyerite Information

Help on Chemical  Formula: Chemical Formula: BaFe(Fe++,Mn,Mg)Si2O7
Help on Composition: Composition: Molecular Weight = 413.76 gm
   Barium     33.19 %  Ba   37.06 % BaO
   Magnesium   0.59 %  Mg    0.97 % MgO
   Manganese   3.98 %  Mn    5.14 % MnO
   Iron       21.60 %  Fe   27.78 % FeO
   Silicon    13.58 %  Si   29.04 % SiO2
   Oxygen     27.07 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: BaFe2+1.6Mn2+0.3Mg0.1Si2O7
Help on Environment: Environment: In vesicles of melilite-leucite-nephelinite; may represent crystallization of an associated green glass.
Help on IMA Status: IMA Status: Approved IMA 1973
Help on Locality: Locality: From the rim of Mt. Nyiragongo colano, Kivu Province, Zaire. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Andre Marie Meyer (1890- ), Belgian geologist with the Geological Survey of the Belgian Congo, who first collected the mineral.
Help on Name Pronunciation: Name Pronunciation: Andremeyerite + Pronunciation Say ANDREMEYERITE
Help on Synonym: Synonym: ICSD 202607
  PDF 26-1031

Andremeyerite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5431:1:0.5139
Help on Cell Dimensions: Cell Dimensions: a = 7.488, b = 13.785, c = 7.085, Z = 4; beta = 118.23° V = 644.34 Den(Calc)= 4.26
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.055(1), 3.122(0.8), 3.288(0.6),

Physical Properties of Andremeyerite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Emerald green.
Help on Density: Density: 4.15
Help on Hardness: Hardness: 5.5 - Knife Blade

Optical Properties of Andremeyerite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.045 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1753,KPDmeas= 0.1799,KC= 0.1722
Ncalc = 1.71 - 1.73
Help on Optical Data: Optical Data: Biaxial (+), a=1.74, b=1.74, g=1.76, bire=0.0200, 2V(Calc)=0, 2V(Meas)=0.

Calculated Properties of Andremeyerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.92 gm/cc
note: Specific Gravity of Andremeyerite =4.26 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PEAndremeyerite = 153.08 barns/electron
U=PEAndremeyerite x rElectron Density= 599.86 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Andremeyerite is Not Radioactive

Andremeyerite Classification

Help on  Dana Class: Dana Class: 56.02.06c.06 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02)with cations in [4] and/or >[4] coordination
  (56.02.06c)Seidozerite - Lamprophyllite group (Lamprophyllite subgroup)
56.02.06c.01 Barytolamprophyllite Ba2Na3(Fe,Ti)3(Si2O7)2(O,OH,F)4 C 2/m 2/m
56.02.06c.02 Delindeite Ba2(Na,K,[])3(Ti,Fe)[Ti2(O,OH)4Si4O14](H2O,OH)2 A2/m 2/m
56.02.06c.03 Ericssonite BaMn2FeO[Si2O7](OH) C 2/m 2/m
56.02.06c.04 Lamprophyllite Na2(Sr,Ba)2Ti3(SiO4)4(OH,F)2 C 2/m 2/m
56.02.06c.05 Orthoericssonite BaMn2(FeO)Si2O7(OH) Pmmn 2/m 2/m 2/m
56.02.06c.06 Andremeyerite BaFe(Fe,Mn,Mg)Si2O7 P 21/c 2/m
56.02.06c.07 Eveslogite! (Ca,K,Na,Sr,Ba)48[(Ti,Nb,Fe,Mn)12(OH)12Si48O144](F,OH,Cl)14 P 2/m 2/m
56.02.06c.08 Nabalamprophyllite! Ba(Na,Ba){Na3Ti[Ti2O2Si4O14](OH,F)2} P 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.BB.20 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BB -Si2O7 groups, without non-tetrahedral anions;
09.BB.20 Andremeyerite BaFe(Fe,Mn,Mg)Si2O7 P 21/c 2/m

Other Andremeyerite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Andremeyerite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: 56.02.06c.06 Strunz No: 09.BB.20





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