| 词条 | Franckeite |
| 释义 |
| name = Franckeite | category = Sulfosalt mineral | boxwidth = | boxbgcolor = | image = Franckeite-119411.jpg | imagesize = 260px | alt = | caption = Franckeite var. Potosíite, San José Mine, Cercado Province Bolivia. Field of view about 10mm. | formula = (Pb,Sn2+)6Fe2+Sn2Sb2S14 | molweight = | strunz = 2.HF.25b | dana = 03.01.04.02 | system = Triclinic | class = Pinacoidal ({{overline|1}}) (same H-M symbol) | symmetry = P{{overline|1}} | color = Grayish black | colour = | habit = Typically in spherical, rosette aggregates of thin plates; commonly massive, radiated, or foliated | twinning = Complex | cleavage = {010}, perfect | fracture = | tenacity = Flexible, inelastic; slightly malleable | mohs = 2.5 - 3 | luster = Metallic | streak = Grayish black | diaphaneity = Opaque | gravity = 5.88 – 5.92 | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = Weak | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence= | absorption = | melt = | fusibility = | diagnostic = | solubility = | other = | alteration = | references = [1][2][3] }} Franckeite, chemical formula Pb5Sn3Sb2S14, belongs to a family of complex sulfide minerals. Franckeite is a sulfosalt. It is closely related to cylindrite. It was first described in 1893 for an occurrence in Chocaya, Potosí Department, Bolivia. It is named after the mining engineers, Carl and Ernest Francke.[2] It can be found in Bolivia at Poopó in Oruro and at Las Aminas, southeast of Chocaya, in Potosi. Franckeite has an average density of 5.7 and can be both grayish black, blackish gray in color. It occurs in hydrothermal silver-tin deposits in Bolivia and in contact metamorphosed limestone deposit in the Kalkar quarry in California. It occurs with cylindrite, teallite, plagionite, zinkenite, cassiterite, wurtzite, pyrrhotite, marcasite, arsenopyrite, galena, pyrite, sphalerite, siderite and stannite.[1]See also
References1. ^1 http://rruff.geo.arizona.edu/doclib/hom/franckeite.pdf Handbook of Mineralogy {{Commons category|Franckeite|position=left}}{{sulfide-mineral-stub}}2. ^1 http://www.mindat.org/min-1592.html Mindat with location data 3. ^http://webmineral.com/data/Franckeite.shtml Webmineral data 5 : Lead minerals|Tin minerals|Antimony minerals|Sulfosalt minerals|Triclinic minerals |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。