| 词条 | Polybasite | |
| 释义 |
| name = Polybasite | boxwidth = | boxbgcolor = | image = Polybasite-37890.jpg | imagesize = | alt = | caption = | category = Sulfosalt minerals | formula = [(Ag,Cu)6(Sb,As)2S7][Ag9CuS4] | molweight = | strunz = 2.GB.15 | dana = | system = Monoclinic and trigonal polytypes | class = Prismatic (2/m) (same H-M symbol) | symmetry = C2/c | unit cell = | color = | colour = steel black | habit = | twinning = | cleavage = poor on (001) | fracture = uneven | tenacity = | mohs = 1.5-2 | lustre = metallic, adamantine or glimmering | streak = black with reddish tint | diaphaneity = | gravity = 6-6.2 | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = [1][2][3][4] }} Polybasite is a sulfosalt mineral of silver, copper, antimony and arsenic. Its chemical formula is [(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]. It forms black monoclinic crystals (thin, tabular, with six corners) which can show dark red internal reflections. It has a Mohs hardness of 2.5 to 3. It is found worldwide and is an ore of silver. The name comes from the number of base metals in the mineral. ImagesReferences1. ^Polybasite: mindat.org {{Refbegin}}{{Refend}}{{commons category|Polybasite}}{{Sulfide-mineral-stub}}2. ^Webmineral.com 3. ^Handbook of Mineralogy 4. ^{{cite book|title=Minerals of the World|year=1990|isbn=0-517-68030-0|author=Rudolf Dǔd'a and Luboš Rejl|publisher=Arch Cape Press|page=40}} 6 : Silver minerals|Copper minerals|Antimony minerals|Arsenic minerals|Sulfosalt minerals|Monoclinic minerals |
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