| 词条 | Faizievite |
| 释义 |
| name = Faizievite | category = Silicate mineral, Cyclosilicate | image = | imagesize = | alt = | caption = | formula = K2Na(Ca6Na)Ti4Li6Si24O66F2 | strunz = | dana = 63.2.10.1 | system = Triclinic | class = Pinacoidal ({{overline|1}}) (same H-M symbol) | symmetry = P{{overline|1}} | unit cell = a = 9.82, b = 9.82 c = 17.31 [Å], α = 99.209(2)° β = 94.67(2)°, γ = 119.839(1)° (approximated); Z = 1 | color = Colorless | colour = | habit = tabular plates | twinning = | cleavage = None | fracture = | tenacity = Brittle | mohs = 4-4.5 | luster = Vitreous | streak = | diaphaneity = Opaque | gravity = | density = 2.83 (measured) | polish = | opticalprop = Biaxal (+) | refractive = np=1.65, nm=1.66 (approximated) | birefringence = | pleochroism = | 2V = -72o (measured), -70o (calculated, approximated) | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | references = [1][2] }}Faizievite is a very rare mineral[1] with the formula K2Na(Ca6Na)Ti4Li6Si24O66F2.[2] This triclinic mineral is chemically related to baratovite and katayamalite.[3][4] Faizievite is a single-locality mineral, coming from the moraine of the Darai-Pioz glacier, Tien Shan Mountains, Tajikistan. Alkaline rocks of this site are famous for containing numerous rare minerals, often enriched in boron, caesium, lithium, titanium, rare earth elements, barium, and others.[5] Occurrence and associationFaizievite was detected in quartz boulders, together with aegirine, baratovite, fluorite, leucosphenite, pectolite, and polylithionite.[2] Notes on chemistry and structureStrontium and trace amounts of rubidium, barium and niobium are present in the structure of faizievite. One of the sodium sites is partially vacant, and fluorine may be substituted by oxygen.[2]Relation to other mineralsFaizievite is related to beryl and osumilite groups of minerals.[1] References1. ^1 2 {{cite web|url=http://www.mindat.org/min-31306.html |title=Faizievite: Faizievite mineral information and data |website=Mindat.org |accessdate=2016-03-05}} {{mineral-stub}}2. ^1 2 3 Agakhanov, A.A., Pautov, L.A., Uvarova, Y.A., Sokolova, E.V., Hawthorne, F.C., Karpenko, V.Y., and Gafurov, F.G., 2007. Faizievite, K2Na(Ca6Na)Ti4Li6Si24O66F2 - a new mineral species. New data on minerals 42, 5-10 3. ^{{cite web|url=http://www.mindat.org/min-512.html |title=Baratovite: Baratovite mineral information and data |website=Mindat.org |accessdate=2016-03-10}} 4. ^{{cite web|url=http://www.mindat.org/min-4716.html |title=Katayamalite: Katayamalite mineral information and data |website=Mindat.org |accessdate=2016-03-10}} 5. ^{{cite web|url=http://www.mindat.org/loc-3241.html |title=Darai-Pioz Glacier (Dara-i-Pioz; Dara-Pioz), Alai Range (Alayskiy), Tien Shan Mtn, Region of Republican Subordination, Tajikistan - Mindat.org |website=Mindat.org |accessdate=2016-03-05}} 9 : Silicate minerals|Cyclosilicates|Lithium minerals|Titanium minerals|Potassium minerals|Sodium minerals|Calcium minerals|Fluorine minerals|Triclinic minerals |
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