Andremeyerite Mineral Data

Andremeyerite Mineral Data +

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General Andremeyerite Information

Chemical Formula:

BaFe(Fe++,Mn,Mg)Si2O7

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

Empirical Formula:

BaFe²⁺_1.6Mn²⁺_0.3Mg_0.1Si₂O₇

Environment:

In vesicles of melilite-leucite-nephelinite; may represent crystallization of an associated green glass.

IMA Status:

Approved IMA 1973

Locality:

From the rim of Mt. Nyiragongo colano, Kivu Province, Zaire. Link to MinDat.org Location Data.

Name Origin:

For Andre Marie Meyer (1890- ), Belgian geologist with the Geological Survey of the Belgian Congo, who first collected the mineral.

Synonym:

ICSD 202607

PDF 26-1031

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Andremeyerite Crystallography

Axial Ratios:

a:b:c =0.5431:1:0.5139

Cell Dimensions:

a = 7.488, b = 13.785, c = 7.085, Z = 4; beta = 118.23° V = 644.34 Den(Calc)= 4.26

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.055(1), 3.122(0.8), 3.288(0.6),

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

Cleavage:

[???] Perfect

Color:

Emerald green.

Density:

4.15

Hardness:

5.5 - Knife Blade

Optical Properties of Andremeyerite

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

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

Electron Density:

r_electron=3.92 gm/cc
note: r_{Andremeyerite}=4.26 gm/cc.

Fermion Index

Fermion Index = 0.07078
Boson Index = 0.92922

Photoelectric:

PE_{Andremeyerite}= 153.08 barns/electron
U=PE_{Andremeyerite} x r_electron= 599.86 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Andremeyerite is Not Radioactive

Andremeyerite Classification

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

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

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Andremeyerite

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

Notes: