paramelaconite

{{Infobox mineral | name = Paramelaconite | category = Oxide mineral | boxwidth = | boxbgcolor = | image = Paramelaconite-304492.jpg | imagesize = | caption = Paramelaconite from the Copper Queen Mine, Cochise County, Arizona, USA | formula = CuCuO3 (or Cu4O3) | IMAsymbol = Pml | molweight = | strunz = 4.AA.15 | dana = 4.6.4.1 | system = Tetragonal | class = Ditetragonal dipyramidal (4/mmm) H-M group: (4/m 2/m 2/m) | symmetry = I41/amd {I41/a 2/m 2/d} | unit cell = a = 5.837 Å, c = 9.932 Å; Z = 4 | color = Black to black with a slight purple tintWhite with pinkish brown tint in reflected light | habit = Occurs as striated prismatic crystals; massive | twinning = | cleavage = None observed | fracture = Conchoidal | tenacity = Brittle | mohs = 4.5 | luster = Sub-adamantine, greasy, sub-metallic | polish = | refractive = | opticalprop = Uniaxial | birefringence = | 2V = | dispersion = | pleochroism = Weak | fluorescence= Not fluorescent | absorption = | streak = Brown-black | gravity = 6.04–6.11 (measured) | density = | melt = | fusibility = | diagnostic = | solubility = Soluble in HCl and HNO3 | diaphaneity = Opaque | other = | references = }}

Paramelaconite is a rare, black-colored copper(I,II) oxide mineral with formula CuCuO3 (or Cu4O3). It was discovered in the Copper Queen Mine in Bisbee, Arizona, about 1890. It was described in 1892 and more fully in 1941. Its name is derived from the Greek word for "near" and the similar mineral melaconite, now known as tenorite.