Images
Formula: MgAl2(AsO4)2(OH)2.8H2O
Hydrated normal arsenate, maghrebite group
Crystal System: Triclinic
Specific gravity: 2.60 measured, 2.46 calculated
Streak: White
Colour: Colourless
Environments
Localities
At the type locality, the Aghbar open pit, Aghbar, Tansifite Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet
Region, Morocco, maghrebite is associated with quartz,
erythrite,
talmessite/roselite,
arseniosiderite,
wendwilsonite,
pharmacoalumite
and cabalzarite. It results from the weathering of
cobalt arsenides in a hydrothermal
copper - nickel -
arsenic - (copper -
uranium -
molybdenum) vein. Maghrebite forms lozenge-shaped prismatic
crystals up to 0.2 mm in length; it is colourless and translucent with a vitreous lustre
(EJM 24.717-726, HOM).
Back to Minerals