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Formula: CaZnFe3+(AsO4)2(OH).H2O
Anhydrous arsenate,
tsumcorite group
Crystal System: Monoclinic
Specific gravity: 4.25 measured, 4.25 calculated
Hardness: 3
Streak: Light yellow
Colour: Brownish yellow, yellow
Common impurities: Cu,Al,Pb
Environments
Localities
At the Aghbar open pit, Aghbar, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco, small brown acicular crystals
of ferrilotharmeyerite line 1 mm vugs in grains of
chalcopyrite/chalcocite, which in
turn are encrusted by dark green
conichalcite/cobaltaustinite.
These aggregates occur with deep red, 1 mm rhombohedral crystals of
spherocobaltite, in cavities in a
dolostone/serpentinite
breccia
(Minrec 38.5.374-375).
At Vein No. 52, Aït Ahmane, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco, ferrilotharmeyerite was
found in a cavity in a specimen of brecciated
löllingite ore, as tiny lath-shaped and acicular crystals accompanied by
talmessite
(Minred 38.5.374-375).
At the type locality, the Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia, ferrilotharmeyerite occurs as multiple
subhedral crystallites and as tabular to wedge or lozenge shaped crystals. The matrix appears to be
feldspathic quartzite showing
pervasive staining by
hematite. Ferrilotharmeyerite rims
conichalcite and is in contact with
tennantite. Large crystals of scorodite
and schneiderhöhnite also occur on the specimen. Another museum specimen
from the same locality has been found with ferrilotharmeyerite associated with
beudantite
(CM 30.215-217). The deposit is a dolostone hosted hydrothermal
polymetallic ore deposit
(Mindat).
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