Humboldtine
FeC2O4·2H2O
Description
Humboldtine is a rarely occurring mineral from the mineral class of "organic compounds" with the chemical composition FeC2O4•2H2O and is therefore a water-containing iron(II) oxalate or the iron salt of oxalic acid.
Chemical FormulaFeC2O4·2H2O
Crystal SystemMonoclinic
Mohs Hardness1.5 to 2
ColorYellow to amber-yellow
LusterResinous to dull
StreakPale yellow
CleavagePerfect on {110}, imperfect on {100} and {010}