| 词条 | Spertiniite |
| 释义 |
| name = Spertiniite | boxwidth = | image = Spertiniite-93262.jpg | imagesize = 260px | alt = | caption = Spertiniite from Dzhezkazgan, Kazakhstan (size: 5 mm) | category = Oxide mineral | formula = Cu(OH)2 | molweight = 97.56 g/mol | strunz = 4.FD.05 | dana = 6.2.4.1 | system = Orthorhombic | class = Pyramidal (mm2) H-M symbol: (mm2) | symmetry = Cmc21 | unit cell = a = 2.95 Å, b = 10.59 Å c = 5.27 Å; Z = 4 | color = Blue, blue-green | habit = Flat tabular crystals occurring in radial to botryoidal aggregates | twinning = | cleavage = None | fracture = | tenacity = Brittle | mohs = Soft | luster = Vitreous | streak = | diaphaneity = Transparent | gravity = 3.93 | density = | polish = | opticalprop = Biaxial | refractive = nα = 1.720, nβ= n.d., nγ = > 1.800 | birefringence = | pleochroism = Strong; X = colorless; Z = dark blue | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = Decomposes in hot water (synthetic) | references = [1][2][3] }}Spertiniite is a rare copper hydroxide mineral. Chemically it is copper(II) hydroxide with formula Cu(OH)2. It occurs as blue to blue green tabular orthorhombic crystal aggregates in a secondary alkaline environment altering chalcosite. Associated minerals include chalcocite, atacamite, native copper, diopside, grossular and vesuvianite.[2] Discovery and occurrenceIt was first described in 1981 for an occurrence in the Jeffrey quarry of the Johns-Manville mine, Asbestos, Estrie, Québec. It was named for mine geologist Francesco Spertini (born 1937).[1][2] In addition to the type locality, it has also been reported from Mont Saint-Hilaire, Quebec; Ely, White Pine County, Nevada; and Bisbee, Cochise County, Arizona. It has been reported from Dzhezkazgan, Kazakhstan; from slag at Juliushutte, Astfeld, Harz Mountains, Germany; and from Tsumeb, Namibia.[2] A 2006 study has produced evidence the blue mineral chrysocolla may be a microscopic mixture of spertiniite, amorphous silica and water.[4][5] References1. ^1 Spertiniite on Mindat 2. ^1 2 3 Spertiniite in the Handbook of Mineralogy 3. ^Spertiniite on Webmineral 4. ^François Farges, Karim Benzerara, Gordon E. Brown, Jr.; Chrysocolla Redefined as Spertiniite; SLAC-PUB-12232; 13th International Conference On X-Ray Absorption Fine Structure (XAFS13); July 9-14, 2006; Stanford, California 5. ^Chrysocolla on Mindat 3 : Copper minerals|Hydroxide minerals|Orthorhombic minerals |
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