capgaronnite

{{Infobox mineral | name = Capgaronnite | category = Sulfide mineral Halide mineral | image = Capgaronnite.jpg | imagesize = 260px | caption = A lot of small almost black microcrystals of the extremely rare capgaronnite in a white contrasting matrix. | formula = • | IMAsymbol = Cga | molweight = | strunz = 2.FC.20a | dana = 2.15.6.1 | system = Orthorhombic | class = | symmetry = P222 | unit cell = a = 6.8 Å; b = 12.87 Å; c = 4.52 Å; Z = 4 | color = Black, gray, greenish, yellow | habit = Prismatic | cleavage = perfect {010} | twinning = Contact twinning | fracture = Uneven | mohs = | luster = Sub-Adamantine, Sub-Metallic | refractive = nα = 2.200 nγ = 2.300 | opticalprop = | birefringence = | pleochroism = thin splinters, α = dark brown and γ = gray to clear purple | streak = Gray-black | gravity = 6.19 | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Translucent, Opaque | other = | references = }}

Capgaronnite (•) is a mineral that forms small tufted aggregates or isolated crystals with a maximum width of 0.02mm and a maximum length of 0.1mm. This mineral is related to perroudite in chemical composition and crystal structure. Capgaronnite is associated with secondary minerals of Cu like olivenite, cyanotrichite, and tennantite.