| 词条 | Putnisite |
| 释义 |
| name = Putnisite | category = | boxwidth = | boxbgcolor = | image = Putnisite.jpg | caption = Putnisite, from Polar Bear Peninsula, Western Australia, Australia | formula = SrCa4Cr83+(CO3)8(SO4)(OH)16·25 H2O | strunz = | system = Orthorhombic | class = Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) | symmetry = Pnma | unit cell = a = 15.351 Å, b = 20.421 Å, c = 18.270 Å; Z = 4 | color = Purple | habit = Pseudocubic crystals | cleavage = [100], [010] and [001] good | fracture = Brittle - uneven | mohs = 1.5-2 | luster = Vitreous | refractive = nα = 1.552, nβ = 1.583 and nγ = 1.599 | opticalprop = Biaxial (–) | birefringence = | pleochroism = Distinct: X pale bluish grey, Y pale purple, Z pale purple | streak = Pink | gravity = 2.20 | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Translucent | other = | references = [1][2][3][4]}}Putnisite is a mineral composed of strontium, calcium, chromium, sulfur, carbon, oxygen and hydrogen.[3] It was discovered on the Polar Bear Peninsula in Shire of Dundas, Western Australia in 2007 during mining activity.[3][4] Following identification and recognition by the IMA in 2012[4] the mineral was named after mineralogists Andrew and Christine Putnis.[2] Putnisite has unique chemical and structural properties, and does not appear to be related to any of the existing mineralogical families.[2] Crystals are translucent purple, but show distinct pleochroism (from pale purple to pale bluish grey,[3] depending on the angle of observation) and leave pink streaks when rubbed on a flat surface.[3] Putnisite occurs as small (< 0.5 mm) cube-like crystals in volcanic rock.[2] The mineral formed during the oxidation environment within komatiite to dioritic bodies containing sulfide minerals.[3] References1. ^[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Putnisite Mineralienatlas] {{Mineral-stub}}2. ^1 2 3 {{cite web|url=http://www.adelaide.edu.au/news/news70062.html|publisher=University of Adelaide|title=New Mineral Shows Nature's Infinite Variability |accessdate=26 April 2014}} 3. ^1 2 3 4 5 {{cite web|url=http://minmag.geoscienceworld.org/content/78/1/131.abstract|publisher=Mineralogical Magazine |title=Putnisite |accessdate=26 April 2014 }} 4. ^1 2 {{cite web|url=http://www.mindat.org/min-42732.html |title=Putnisite: Putnisite mineral information and data |publisher=Mindat.org |date=2014-04-07 |accessdate=2014-04-29}} 7 : Strontium minerals|Calcium minerals|Chromium minerals|Sulfate minerals|Carbonate minerals|Hydroxide minerals|Orthorhombic minerals |
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