The two minerals are isostructural and share the same chemistry, except for the primary anion group. Connellite is a secondary mineral found in some unusual oxidation zones of copper deposits. When available, specimens should quickly be purchased as they will soon be a treasured addition to anyone's collection. Color is deep blue to a more rare, blue-green. Luster is vitreous.
Specimens are mostly translucent to individual crystals being transparent.
Crystal Habits include acicular to fibrous crystals arranged in tufts, layers or radial aggregates. Cleavage is absent. Fracture is uneven. Streak is blue. Associated Minerals include quartz , azurite , cuprite , brochantite , caledonite , atacamite , paratacamite , paramelaconite , malachite , cornubite and chalcophyllite , among others.