It wasn't until the 1850's that connellite was properly identified as a copper sulfate. Connellite is related to the nitrate mineral buttgenbachite . 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.