Images
Formula: Co(AsO3OH).H2O(Co2+As5+)
Hydrated hydrogen arsenate,
koritnigite
group,
cobalt-bearing mineral
Crystal System: Triclinic
Specific gravity: 3.44 calculated
Hardness: 2 to 3
Streak: Pale pink
Colour: Pale to intense purple, pale rose red to intense purple-rose
Common impurities: Zn
Environments
Localities
At the Richelsdorf mining district, Hersfeld-Rotenburg, Kassel Region, Hesse, Germany, cobaltkoritnigite occurs as an alteration
product of cobaltite (AM 67.414, Dana) associated with
erythrite, cobaltite,
calcite, baryte and
quartz
(HOM).
At the type locality, the Schwarzenberg mining district, Erzgebirgskreis, Saxony, Germany, cobaltkoritnigite occurs as a
post-mining weathering product of glaucodot in cobalt ore. Associated minerals include
erythrite–kottigite,
cobaltite, spherocobaltite,
pitticite, glaucodot,
löllingite–safflorite,
arsenopyrite and quartz
(AM 67.414, HOM, Dana, Mindat).
At the Bou Azzer mining district, Drâa-Tafilalet Region, Morocco, cobaltkoritnigite is the most common weathering product of some
cobalt ores such as skutterudite. At this locality the
cobaltkoritnigite contains no zinc.
It is widespread as efflorescences associated with erythrite and it found preferentially in cavity
zones which are rich in arsenolite. At Tamdrost botryoids to 1 mm occur in cavities in
erythrite-rich skutterudite
(Minrec 38.5.368).
Back to Minerals