Ericssonite Mineral Data

Ericssonite Mineral Data +

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General Ericssonite Information

Chemical Formula:

BaMn++2Fe+++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:

Intergrown with orthoericssonite in a schefferite-rhodonite-tephroite skarn.

IMA Status:

Approved IMA 1971

Locality:

Langban mine, near Filipstad, Varmland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for John E. Ericsson (1803-1883), Swedish-born American engineer and inventor, designer of the iron-clad ship Monitor.

Ericssonite 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

Ericssonite Crystallography

Axial Ratios:

a:b:c =2.9103:1:0.7596

Cell Dimensions:

a = 20.46, b = 7.03, c = 5.34, Z = 4; beta = 95.5° V = 764.54 Den(Calc)= 4.38

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 3.51(1), 2.687(0.7), 2.78(0.6),

Physical Properties of Ericssonite

Cleavage:

[100] Perfect, [011] Distinct

Color:

Reddish black.

Density:

4.21

Diaphaniety:

Translucent to Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Sub Metallic

Magnetism:

Weakly magnetic

Streak:

brown

Optical Properties of Ericssonite

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= 0.1926,KPDmeas= 0.2004,KC= 0.1999

Optical Data:

Biaxial (+), a=1.802-1.807, b=1.833-1.84, g=1.888-1.891, bire=0.0840-0.0860, 2V(Calc)=76-80, 2V(Meas)=30.

Pleochroism (x):

pale greenish tan or yellow brown.

Pleochroism (y):

reddish brown or reddish brown.

Pleochroism (z):

deep brown or deep brown.

Calculated Properties of Ericssonite

Electron Density:

r_electron=3.89 gm/cc
note: r_Ericssonite=4.21 gm/cc.

Fermion Index

Fermion Index = 0.05622
Boson Index = 0.94378

Photoelectric:

PE_Ericssonite= 127.89 barns/electron
U=PE_Ericssonite x r_electron= 497.58 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ericssonite is Not Radioactive

Ericssonite Classification

Dana Class:

56.2.6c.3 (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.13-40 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 Ericssonite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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Ericssonite

BaMn++2Fe+++O[Si2O7](OH)
Dana No: 56.2.6c.3 Strunz No: VIII/C.13-40
Locality:

Notes: