General Information:
Chemical Formula:BaMn++2Fe+++O[Si2O7](OH)
Composition:(Molecular Weight = 504.22 gm)Barium 27.24 %
BaManganese 21.79 %
MnIron 11.08 %
FeSilicon 11.14 %
SiHydrogen 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
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