Chemical Formula: (Fe++,Fe+++)2-3Si2O5(OH)4
Help on Composition: Composition: Molecular Weight = 354.28 g
 
Hydrogen 0.94 % H 8.39 % H2O 0.00 %
Oxygen 37.48 % O 0.00 % 0.00 %
Silicon 17.44 % Si 37.31 % SiO2 0.00 %
Iron 44.14 % Fe 46.64 % FeO 11.27 % Fe2O3



100.00 % 92.34 % 11.27 %
 
Help on Empirical Formula: Empirical Formula: Fe2+2.3Fe3+0.5Si2.2O5(OH)3.3
Help on Environment: Environment: A primary phase in some banded iron formations
Help on Locality: Locality: Biwabik Iron Formation, Mesabi Range, Minnesota, USA.. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: In allusion to its green color
Help on Synonym: Synonym: