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Knasibfite

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


Classification of Knasibfite

Approved
Approval Year:
2006
3.CH.25

3 : HALIDES
C : Complex halides
H : Silicofluorides

Physical Properties of Knasibfite

Colour:
colourless
Density:
2.75(1) g/cm3 (Measured)    2.77 g/cm3 (Calculated)

Optical Data of Knasibfite

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

Chemical Properties of Knasibfite

Formula:
K3Na4[SiF6]3[BF4]
Elements listed in formula:

Crystallography of Knasibfite

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 Volume:
V 866.7 ų
Z:
2
X-Ray Powder Diffraction Data:
d-spacingIntensity
8.55 (50)
8.10 (25)
4.724 (25)
4.043 (100)
3.175 (30)
2.281 (50)
2.095 (25)
1.795 (25)

Type Occurrence of Knasibfite

Associated Minerals at Type Locality:

Relationship of Knasibfite to other Species

3.CH.05MalladriteNa2SiF6
3.CH.10Bararite(NH4)2SiF6
3.CH.15Cryptohalite(NH4)2SiF6
3.CH.15HieratiteK2SiF6
3.CH.20DemartiniteK2SiF6

Other Names for Knasibfite

Name in Other Languages:
Simplified Chinese:氟硼硅钾钠石

Other Information

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 Knasibfite

Reference List:
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.

Internet Links for Knasibfite

mindat.org URL:
https://www.mindat.org/min-31406.html
Please feel free to link to this page.

Localities for Knasibfite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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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