Multiple oxide. Karibibite is not an arsenate with As5+O4 groups, but rather it is classified as an oxide, with As3+. It is indicative of an extremely arsenic-rich environment (Minrec 38.5.379-381).
Specific gravity: 4.07
Hardness: 1 to 2
Streak: Light yellow
Colour: Brownish yellow
Solubility: Readily soluble in dilute acids or in dilute alkali hydroxide solutions (Dana)
At Bou Azzer, Morocco, karibibite occurs in massive löllingite as world-class specimens of crystal aggregates of karibibite associated with aggregates of parasymplesite and grains of pharmacosiderite. It also forms aggregates on quartz crystals with schneiderhöhnite, parasymplesite and erythrite, and separately associated with conichalcite and lavendulan (Minrec 38.5.379-381, R&M 95.2.174-179).
At the type locality, Karibib, Erongo Region, Namibia, karibibite occurs in vugs in löllingite in the Karibib pegmatite, associated with löllingite, eosphorite, scorodite and quartz (AM 59.382, HOM, R&M 95.2.174-179).
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