Images
Formula: Ca2Co(AsO4)2.2H2O
Hydrated normal arsenate,
fairfieldite group, triclinic
paramorph of monoclinic roselite,
cobalt-bearing mineral, forms a series with
talmessite
Crystal System: Triclinic
Specific gravity: 3.71
Hardness: 3½ to 4
Streak: Pale red
Colour: Dark rose red, dark pink
Common impurities: Mg
Environments
Anorthoroselite is a rare secondary mineral in
cobalt-bearing hydrothermal mineral deposits
(HOM).
Localities
At Dome Rock Copper Mine, Boolcoomatta Reserve, Olary Province, South Australia, anorthoroselite is
associated with erythrite,
arthurite, conichalcite,
chenevixite, scorodite,
cobaltaustinite and
heterogenite
(HOM).
At the type locality, Schneeberg, Erzgebirgskreis, Saxony, Germany, anorthoroselite occurs as granular masses
associated with pale pink cobalt-bearing
calcite and a few grains of dark rose-coloured
roselite, in vein material consisting principally of
quartz and pyrite. All of the minerals
appear to be primary hydrothermal deposits
(AM 40.832-833)
At the Bou Azzer mining district, Drâa-Tafilalet Region, Morocco, anorthoroselite and
talmessite are almost indistinguishable from each other. They are rare
world-wide but widespread here, occurring rarely as free-standing crystals to 1 cm in size, and more commonly as rounded
clusters, subparallel aggregates and coral-like spherules. Crystals of anorthoroselite with
talmessite cores have been found resting on a
dolomite matrix associated with
wendwilsonite, and epitactic intergrowths of anorthoroselite and
roselite have been found in cavities in
dolomite associated with
cobaltlotharmeyerite and
cobaltaustinite
(Min Rec 38-5.393).
Back to Minerals