Here the presence of erythrite gives the first sign of cobalt mineralization.
The mineralogical fame of the Bou Azzer district is founded on its extensive suite of rare and colorful arsenates, and especially on its superlative macro-specimens of erythrite, roselite, roselitebeta and wendwilsonite.
Erythrite from Veins 7/5, Bou Azzer (2000-2001): deep red tabular crystals to more than 3.5 cm.
Erythrite from Oumlil and Agoudal (2005): metallic-violet-red tabular and acicular crystals, some more than 2 cm, associated with sphaerocobaltite, the latter as carmine-red rhombohedral crystals to 1 mm.
Associations include erythrite, annabergite, talmes-site, powellite, galena and native gold.
(1982), as vivid blue spherules composed of crystals measuring less than 0.01 mm, associated with erythrite, pharmacolite, lollingite, bluish green mcguinessite, talc and hematite on coarsely cleavable dolomite.
A dark variety appears in Vein 52, Ait Ahmane, with lollingite and fibrous erythrite. Rosettes of arseniosiderite perch on the faces of some large pyritohedral crystals of skutterudite from Vein 59, Ait Ahmane.
In many cases the fissures are coated by newly formed erythrite and by countless octahedral crystals of arsenolite in colorless, white, or pale violet colors with a diamond-like brilliance.
In early 2002, at Aghbar, a dolomite boulder enriched in sulfides and shot through with erythrite was found.
Several good Moroccan erythrite specimens and one very good roselite were also available.
Francois and Christine also had erythrite from the new find, including a beautiful miniature 3 x 5 cm, with 2.5-cm crystals, at $1,950.