General Information:
Chemical Formula:
BaMn++2Fe+++O[Si2O7](OH)
Composition:
(Molecular Weight = 504.22 gm)
Barium 27.24 % Ba
Manganese 21.79 % Mn
Iron 11.08 % Fe
Silicon 11.14 % Si
Hydrogen 0.20 % H
Oxygen 28.56 % O
Empirical Formula:
BaMn2+2Fe3+Si2O8(OH)
Environment:
Intergrown with orthoericssonite in a schefferite-rhodonite-tephroite skarn.
IMA Status:
Approved IMA 1968
Locality:
Langban mine, near Filipstad, Varmland, Sweden.
Name Origin:
Named for John E. Ericsson (1803-1883), Swedish-born American engineer and inventor, desighner of the iron-clad ship Monitor.
Physical Properties:
Cleavage:
[100] Perfect, [011] Distinct
Color:
reddish black.
Density:
4.21
Diaphaniety:
Translucent to Opaque
Habits:
Massive - Uniformly indistinguishable crystals forming large masses., Platy - Sheet forms (e.g. micas).,
Hardness:
4.5 - Between Fluorite and Apatite
Luster:
Sub Metallic
Streak:
brown
More details...