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Formula: Fe2+(C2O4).2H2O
Organic compound, humboldtine group
Crystal System: Monoclinic
Specific gravity: 2.28 measured, 2.307 calculated
Hardness: 1½ to 2
Colour: Yellow to amber-yellow, lemon-yellow
Solubility: Soluble in acids
Environments
Pegmatites very rarely
Coal deposits
Hydrothermal environments
Humboldtine is a rare authigenic organic mineral occurring on fracture surfaces in coal
deposits and rarely in granitic
pegmatites and hydrothermal mineral
deposits. It is a common biomineral formed by the action of lichens on
iron-rich
limestones and
copper-bearing rocks
(Mindat).
Humboldtine is associated with gypsum and
tschermigite in coal seams, and with
cassiterite,
tourmaline and
quartz in
pegmatites and hydrothermal environments
(HOM).
Localities
The type locality is the Korozluky magmatic rock occurrence, Korozluky, Most District, Ústí
nad Labem Region, Czech Republic.
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