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Knasibfite

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About KnasibfiteHide

Formula:
K3Na4[SiF6]3[BF4]
Colour:
Colourless
Lustre:
Vitreous
Specific Gravity:
2.75
Crystal System:
Orthorhombic
Name:
Named for its chemical composition (K, Na, Si, B, F).
This page provides mineralogical data about Knasibfite.


Classification of KnasibfiteHide

Approved
Approval Year:
2006
First Published:
2008
3.CH.25

3 : HALIDES
C : Complex halides
H : Silicofluorides

Physical Properties of KnasibfiteHide

Vitreous
Transparency:
Transparent
Colour:
Colourless
Streak:
White
Hardness Data:
Could not be measured
Comment:
Hardness could not be determined because of the small size of the crystals
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
None observed
Density:
2.75(1) g/cm3 (Measured)    2.77 g/cm3 (Calculated)

Optical Data of KnasibfiteHide

Type:
Isotropic
RI values:
nα = 1.320(1)
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Moderate

Chemical Properties of KnasibfiteHide

Formula:
K3Na4[SiF6]3[BF4]
IMA Formula:
K3Na4(SiF6)3(BF4)

Crystallography of KnasibfiteHide

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Imm2
Cell Parameters:
a = 5.522 Å, b = 17.106 Å, c = 9.175 Å
Ratio:
a:b:c = 0.323 : 1 : 0.536
Unit Cell V:
866.7 ų
Z:
2
Morphology:
{001}, {100}, {010}, {110}, {011} and {101}

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0006186KnasibfiteDemartin F, Gramaccioli C M, Campostrini I, Orlandi P (2008) Knasibfite, K3Na4[SiF6]3[BF4], a new hexafluorosilicate-tetrafluoroborate from La Fossa Crater, Vulcano, Aeolian Islands, Italy The Canadian Mineralogist 46 447-4532008La Fossa Crater, Vulcano, Aeolian Islands, Italy0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.55 Å(50)
8.10 Å(25)
4.724 Å(25)
4.043 Å(100)
3.175 Å(30)
2.281 Å(50)
2.095 Å(25)
1.795 Å(25)

Type Occurrence of KnasibfiteHide

Place of Conservation of Type Material:
Reference Collection of Dipartimento di Chimica Strutturale e Stereochimica Inorganica of Università degli Studi di Milano. no. 2006–03.
Associated Minerals at Type Locality:
Reference:
Demartin, F., Gramaccioli, C.M., Campostrini, I., Orlandi, P. (2008) Knasibfite, a new hexafluorosilicate from La Fossa crater, Vulcano, Aeolian Islands, Italy. The Canadian Mineralogist: 46: 447-453.

Synonyms of KnasibfiteHide

Other Language Names for KnasibfiteHide

Simplified Chinese:氟硼硅钾钠石

Related Minerals - Nickel-Strunz GroupingHide

3.CH.05MalladriteNa2[SiF6]Trig.
3.CH.10Bararite(NH4)2[SiF6]Trig. 3m (3 2/m)
3.CH.15Cryptohalite(NH4)2[SiF6]Iso. m3m (4/m 3 2/m) : Fm3m
3.CH.15HieratiteK2[SiF6]Iso. m3m (4/m 3 2/m) : Fm3m
3.CH.20DemartiniteK2[SiF6]Hex. 6mm : P63mc

Fluorescence of KnasibfiteHide

Not fluorescent

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for KnasibfiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Demartin, F., Gramaccioli, C.M., Campostrini, I., Orlandi, P. (2008) Knasibfite, a new hexafluorosilicate from La Fossa crater, Vulcano, Aeolian Islands, Italy. The Canadian Mineralogist: 46: 447-453.
Bandemehr, J., Josefin, K., Sergei, I., Malte, S., Florian, K. (2020) Laboratory synthesis and characterization of Knasibfite K3Na4[SiF6]3[BF4] and the homologous Ge compound K3Na4[GeF6]3[BF4]. Zeitschrift für Kristallographie - Crystalline Materials.

Internet Links for KnasibfiteHide

Localities for KnasibfiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Italy (TL)
 
  • Sicily
    • Messina Province
      • Eolie Islands (Aeolian Islands)
        • Lipari
          • Vulcano Island
F.Demartin, C.M.Gramaccioli, I. Campostrini & P.Orlandi (2008), Knasibfite, a new hexafluorosilicate from La Fossa crater, Vulcano, Aeolian Islands, Italy, Canadian Mineralogist 46, 447-453.
 
Mineral and/or Locality  
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