The mineral also appears near grains of copper sulfide and as chrysocolla pseudomorphs; associated species include conichalcite, lavendulan, annabergite and erythrite.
Cobaltite, one of the most recently formed cobalt sulfarsenides, occurs in minute octahedral crystals associated with erythrite in a safflorite vein.
The cobaltkoritnigite is more violet-colored and the erythrite more pale pink to red.
By contrast to the ubiquitous erythrite, which is found in cavity zones and small veins everywhere in the district, cobaltkoritnigite is found preferentially--and never alone--in cavity zones which are rich in arsenolite.
With the ongoing development of the open-pit mine, cobaltlotharmeyerite has also been identified from a strongly oxidized ore zone rich in erythrite, associated with fine wendwilsonite crystals and with mansfieldite.
In the Mechoui deposit, conichalcite, with erythrite, forms transparent, smooth-surfaced spherules.
Erythrite is the mineral which every collector automatically associates with Bou Azzer.
These specimens show elongated flattened erythrite crystals to more than 3 cm and acicular crystals to 2 cm.
Because erythrite forms thin, leafy crystals and is very soft and non-elastic (like vivianite and gypsum), it is difficult to collect and transport without damage.
Erythrite is found everywhere in the Bou Azzer mining district.
In old, wet mine tunnels at Aghbar, old ore piles are seen to be spotted with fluffy, newly formed "blooms" of erythrite which, with drying, quickly turn white.
Erythrite rests most commonly on quartz, dolomite and skut-terudite.