| 词条 | Filipstadite |
| 释义 |
| name = Filipstadite | category = Oxide mineral | image = | imagesize = | alt = | caption = | formula = (Mn,Mg)(Sb5+0.5Fe3+0.5)O4 | strunz = 4.BB.05 (10 ed) 4/B.05-70 (8 ed) | dana = 7.2.13.1 | system = Isometric | class = Hexoctahedral (m{{overline|3}}m) H–M Symbol (4/m {{overline|3}} 2/m) | symmetry = Fd{{overline|3}}m | unit cell = a = 25.93 Å (approximated); Z = 216 | color = Black | colour = | habit = modified (pseudo)octahedra | twinning = Poor | cleavage = | fracture = Conchoidal | tenacity = Brittle | mohs = 6-6.5 | luster = Metallic | streak = Brown | diaphaneity = | gravity = | density = 4.9 (calculated) | polish = | opticalprop = Biaxal | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | references = [1][2][3] }}Filipstadite is a very rare mineral[2] of the spinel group, with the formula (Mn,Mg)(Sb5+0.5Fe3+0.5)O4.[3] It is isometric,[4] although it was previously though to be orthorhombic. When compared to a typical spinel, both the octahedral and tetrahedral sites are split due to cation ordering.[4] Filipstadite is chemically close to melanostibite.[5] The mineral comes from Långban, Sweden, a manganese skarn deposit famous for many rare minerals.[6] Occurrence and associationIn the metamorphic Fe-Mn ore bodies of the Långban-type filipstadite associates with native antimony, calcite, native copper, forsterite, hausmannite, hedyphane, ingersonite, jacobsite, phlogopite, and svabite.[1] Notes on crystal structureCations and anions in filipstadite occupy {{frac|1|8}} of the octahedral and {{frac|1|2}} of the tetrahedral holes of the spinel-type oxygen lattice, that has cubic close-packing. Tetrahedral sites are split into 5, and octahedral into 6 substitutes, due to cation ordering, which also causes the unit cell edge to be tripled. Antimony, most of magnesium and trace aluminium are located on the octahedral (M) sites, trace magnesium, zinc and silicon are on the tetrahedral (T) sites. Manganese and iron are on both M and T sites.[4] References1. ^1 {{cite web|url=http://www.handbookofmineralogy.org/pdfs/filipstadite.pdf |title=Filipstadite - Handbook of Mineralogy |website=Handbookofmineralogy.org |accessdate=2016-03-12}} {{oxide-mineral-stub}}2. ^1 {{cite web|url=http://www.mindat.org/min-1548.html |title=Filipstadite: Filipstadite mineral information and data |website=Mindat.org |accessdate=2016-03-05}} 3. ^Dunn, P.J., Peacor, D.R., Criddle, A.J., and Stanley, C.J., 1988. Filipstadite, a new Mn-Fe3+-Sb derivative of spinel, from Långban, Sweden. American Mineralogist 73, 413-419. 4. ^1 2 3 Bonazzi, P., Chelazzi, L., and Bindi, L., 2013. Superstructure, crystal chemistry, and cation distribution in filipstadite, a Sb5+-bearing, spinel-related mineral. American Mineralogist 98, 361-366 5. ^{{cite web|url=http://www.mindat.org/min-2631.html |title=Melanostibite: Melanostibite mineral information and data |website=Mindat.org |accessdate=2016-03-10}} 6. ^{{cite web|url=http://www.mindat.org/loc-3167.html |title=Långban, Filipstad, Värmland, Sweden - Mindat.org |website=Mindat.org |accessdate=2016-03-10}} 5 : Spinel group|Oxide minerals|Manganese minerals|Antimony minerals|Cubic minerals |
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