Connellite

Formula:  Cu₁₉Cl₄(SO₄)(OH)₃₂ ^. 3H₂O

Origin of name:  For Arthur Connell, Scottish geologist

Crystal system:  Hexagonal

Crystal class:  -6m2

Twinning:

Unit cell: a = 15.78 Å, c = 9.10 Å

Colour:  Azure blue, bluish green

Diaphaneity:

Luster:  Vitreous

Habit:  Crystals acicular in radiating groups or felt-like aggregates, striated in direction of elongation

Hardness:  3

Specific gravity:  3.36

Cleavage:  None

Tenacity:

Streak:  Pale greenish blue

Synonyms/varieties:

Comments: