Orthoericssonite Mineral Data

Orthoericssonite Mineral Data +

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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)

IMA Status:

Approved IMA 1971

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 201041

PDF 29-185

Orthoericssonite Image

Images:

Click Here for Larger Orthoericssonite Image

Orthoericssonite Ericssonite 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 - DipyramidalH-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

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:

r_electron=3.89 gm/cc
note: r_{Orthoericssonite}=4.21 gm/cc.

Fermion Index

Fermion Index = 0.05622
Boson Index = 0.94378

Photoelectric:

PE_{Orthoericssonite}= 127.89 barns/electron
U=PE_{Orthoericssonite} x r_electron= 497.58 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Orthoericssonite is Not Radioactive

Orthoericssonite Classification

Dana Class:

56.2.6c.5 (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.13-50 VIII - Silicates

VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F]

VIII/C.13 - Rosenbuschite - Lamprophyllite - Hejtmanite series

VIII/C.13-05 Grenmarite! (Zr,Mn)2(Zr,Ti)(Mn,Na)(Na,Ca)4(Si2O7)2(O,F)4 P 2/c 2/m

VIII/C.13-10 Seidozerite (Na,Ca)2(Zr,Ti,Mn)2Si2O7(O,F)2 P 2/c 2/m

VIII/C.13-15 Nabalamprophyllite! Ba(Na,Ba){Na3Ti[Ti2O2Si4O14](OH,F)2} P 2/m 2/m

VIII/C.13-20 Lamprophyllite Na2(Sr,Ba)2Ti3(SiO4)4(OH,F)2 C 2/m 2/m

VIII/C.13-25 Kukisvumite Na6ZnTi4Si8O28·4(H2O) Pccn 2/m 2/m 2/m

VIII/C.13-27 Shkatulkalite! Na10MnTi3Nb3(Si2O7)6(OH)2F·12(H2O) P 2,Pm,P 2/m Mono

VIII/C.13-30 Barytolamprophyllite Ba2Na3(Fe,Ti)3(Si2O7)2(O,OH,F)4 C 2/m 2/m

VIII/C.13-40 Ericssonite BaMn2FeO[Si2O7](OH) C 2/m 2/m

VIII/C.13-50 Orthoericssonite BaMn2(FeO)Si2O7(OH) Pmmn 2/m 2/m 2/m

Other Orthoericssonite Information

References:

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 -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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Orthoericssonite

BaMn2(Fe+++O)Si2O7(OH)
Dana No: 56.2.6c.5 Strunz No: VIII/C.13-50
Locality:

Notes: