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 % Fe₂O₃

Silicon 11.14 % Si 23.83 % SiO₂

Hydrogen 0.20 % H 1.79 % H₂O

Oxygen 28.56 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BaMn²⁺₂Fe³⁺Si₂O₈(OH)

Environment:

In a ï¿½ne-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:

Ericssonite Orthoericssonite Tephroite

Comments: Dark brown ericssonite, intergrown with orthoericssonite, with pink rhodonite, light brown diopside (var. schefferite) and gray tephroite.
Location: Langban, Varmland, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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

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

By Intensity(I/I_o): 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:

PE_{Orthoericssonite}= 127.88 barns/electron
U=PE_{Orthoericssonite} x rElectron 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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