Andremeyerite Mineral Data + Say ANDREMEYERITE

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 Synonym: Synonym: ICSD 202607
  PDF 26-1031
 

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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 - PrismaticH-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),
Click Here for Large Andremeyerite Structure Window Crystal Structure:

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Cannillo E , Mazzi F , Rossi G , American Mineralogist , 73 (1988) p.608-612, Crystal structure of andremeyerite, BaFe(Fe,Mn,Mg)Si2O7

 

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
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:

relectron=3.92 gm/cc
note: rAndremeyerite =4.26 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.07078
Boson Index = 0.92922
Help on Photoelectric: Photoelectric:

PEAndremeyerite = 153.08 barns/electron
U=PEAndremeyerite x relectron= 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: 56.2.6c.6 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.2)with cations in [4] and/or >[4] coordination
  (56.2.6c)Seidozerite - Lamprophyllite group (Lamprophyllite subgroup)
 
56.2.6c.1 Barytolamprophyllite Ba2Na3(Fe,Ti)3(Si2O7)2(O,OH,F)4 C 2/m 2/m
 
56.2.6c.2 Delindeite Ba2(Na,K,[])3(Ti,Fe)[Ti2(O,OH)4Si4O14](H2O,OH)2 A2/m 2/m
 
56.2.6c.3 Ericssonite BaMn2FeO[Si2O7](OH) C 2/m 2/m
 
56.2.6c.4 Lamprophyllite Na2(Sr,Ba)2Ti3(SiO4)4(OH,F)2 C 2/m 2/m
 
56.2.6c.5 Orthoericssonite BaMn2(FeO)Si2O7(OH) Pmmn 2/m 2/m 2/m
 
56.2.6c.6 Andremeyerite BaFe(Fe,Mn,Mg)Si2O7 P 21/c 2/m
 
56.2.6c.7 Eveslogite! (Ca,K,Na,Sr,Ba)48[(Ti,Nb,Fe,Mn)12(OH)12Si48O144](F,OH,Cl)14 P 2/m 2/m
 
56.2.6c.8 Nabalamprophyllite! Ba(Na,Ba){Na3Ti[Ti2O2Si4O14](OH,F)2} P 2/m 2/m
Help on  Strunz Class: Strunz Class: VIII/C.02-90 VIII - Silicates
  VIII/C - Sorosilicates, with [Si2O7]6-, without anions unfamiliar to tetraheders
  VIII/C.02 - Melilite group
 
VIII/C.02-10 Akermanite Ca2MgSi2O7 P 421m 4 2m
 
VIII/C.02-14 Okayamalite! Ca2B2SiO7 P 421m 4 2m
 
VIII/C.02-15 Gehlenite Ca2Al(AlSi)O7 P 421m 4 2m
 
VIII/C.02-30 Gugiaite Ca2BeSi2O7 P 421m 4 2m
 
VIII/C.02-40 Hardystonite Ca2ZnSi2O7 P 421m 4 2m
 
VIII/C.02-50 Leucophanite (Na,Ca)2BeSi2(O,OH,F)7 P1 1
 
VIII/C.02-60 Jeffreyite (Ca,Na)2(Be,Al)Si2(O,OH)7 C 2221 2 2 2
 
VIII/C.02-70 Meliphanite (Ca,Na)2Be[(Si,Al)2O6(F,OH)] I 4 4
 
VIII/C.02-80 Barylite BaBe2Si2O7 Pn21a mm2
 
VIII/C.02-85 Clinobarylite! BaBe2Si2O7 Pmn2 2/m 2/m 2/m
 
VIII/C.02-90 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Print or Cut-and-Paste your Andremeyerite Specimen Label here :

Andremeyerite

BaFe(Fe++,Mn,Mg)Si2O7
Dana No: 56.2.6c.6 Strunz No: VIII/C.02-90
Locality:

 

Notes:

 

 
   
 
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