Orthoericssonite Mineral Data
General Orthoericssonite Information
Chemical Formula:
BaMn2(Fe+++O)Si2O7(OH)
Composition:
Molecular Weight = 504.22 gm
Barium 27.24 % Ba 30.41 % BaO
Manganese 21.79 % Mn 28.14 % MnO
Iron 11.08 % Fe 15.84 % Fe2 O3
Silicon 11.14 % Si 23.83 % SiO2
Hydrogen 0.20 % H 1.79 % H2 O
Oxygen 28.56 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
BaMn2+ 2 Fe3+ Si2 O8 (OH)
Environment:
In a �ne-grained manganoan aegirine zone in well-banded tephroite-rhodonite-manganoan aegirine skarn. Dimorphous with ericssonite.
IMA Status:
Approved IMA 1971
Locality:
From Langban, Varmland, Sweden. Link to MinDat.org Location Data.
Name Origin:
Named for its ORTHOrhombic crystallization and relation to ericssonite.
Name Pronunciation:
Orthoericssonite + Pronunciation
Synonym:
ICSD 201041
PDF 29-185
Orthoericssonite Image
Images:
Orthoericssonite Crystallography
Axial Ratios:
a:b:c =2.9058:1:0.7711
Cell Dimensions:
a = 20.3, b = 6.986, c = 5.387, Z = 4; V = 763.96 Den(Calc)= 4.38
Crystal System:
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmmn
X Ray Diffraction:
By Intensity(I/Io ): 3.28(1), 5.08(0.6), 2.536(0.35),
Physical Properties of Orthoericssonite
Cleavage:
{100} Perfect, {011} Distinct
Color:
Reddish black.
Density:
4.21
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Hardness:
4.5 - Between Fluorite and Apatite
Streak:
brown
Optical Properties of Orthoericssonite
Gladstone-Dale:
CI meas = -0.002 (Superior) - where the CI = (1-KPDmeas /KC ) CI calc = 0.037 (Excellent) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.1925,KPDmeas = 0.2003,KC = 0.1999 Ncalc = 1.84 - 1.88
Optical Data:
Biaxial (+), a=1.802, b=1.84, g=1.888, bire=0.0860, 2V(Calc)=86, 2V(Meas)=50.
Calculated Properties of Orthoericssonite
Electron Density:
Bulk Density (Electron Density)=3.89 gm/cc note: Specific Gravity of Orthoericssonite =4.21 gm/cc.
Fermion Index:
Fermion Index = 0.05 Boson Index = 0.95
Photoelectric:
PEOrthoericssonite = 127.88 barns/electronU=PEOrthoericssonite x r Electron Density= 497.58 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Orthoericssonite is Not Radioactive
Orthoericssonite Classification
Dana Class:
56.02.06c.05 (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
Strunz Class:
09.BE.25 09 - SILICATES (Germanates)
09.B - Sorosilicates
09.BE -Si2O7 groups with additional anions;
09.BE.25 Barytolamprophyllite Ba2Na3(Fe,Ti)3(Si2O7)2(O,OH,F)4 C 2/m 2/m
09.BE.25 Ericssonite BaMn2FeO[Si2O7](OH) C 2/m 2/m
09.BE.25 Lamprophyllite Na2(Sr,Ba)2Ti3(SiO4)4(OH,F)2 C 2/m 2/m
09.BE.25 Orthoericssonite BaMn2(FeO)Si2O7(OH) Pmmn 2/m 2/m 2/m
09.BE.25 Seidozerite (Na,Ca)2(Zr,Ti,Mn)2Si2O7(O,F)2 P 2/c 2/m
09.BE.25 Nabalamprophyllite ! Ba(Na,Ba){Na3Ti[Ti2O2Si4O14](OH,F)2} P 2/m 2/m
09.BE.25 Grenmarite ! (Zr,Mn)2(Zr,Ti)(Mn,Na)(Na,Ca)4(Si2O7)2(O,F)4 P 2/c 2/m
Other Orthoericssonite Information
References:
NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
See Also:
Links to other databases for Orthoericssonite :
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
15 - WWW-MINCRYST
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Orthoericssonite
BaMn2(Fe+++O)Si2O7(OH)
Dana No: 56.02.06c.05 Strunz No: 09.BE.25
Locality:
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