Knasibfite
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About Knasibfite
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 Knasibfite
Approved
Approval Year:
2006
First Published:
2008
3.CH.25
3 : HALIDES
C : Complex halides
H : Silicofluorides
3 : HALIDES
C : Complex halides
H : Silicofluorides
Physical Properties of Knasibfite
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 Knasibfite
Type:
Isotropic
RI values:
nα = 1.320(1)
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Moderate
Chemical Properties of Knasibfite
Formula:
K3Na4[SiF6]3[BF4]
IMA Formula:
K3Na4(SiF6)3(BF4)
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 V:
866.7 ų
Z:
2
Morphology:
{001}, {100}, {010}, {110}, {011} and {101}
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0006186 | Knasibfite | Demartin 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 46 447-453 |  | 2008 | La Fossa Crater, Vulcano, Aeolian Islands, Italy | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 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 Knasibfite
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 Knasibfite
Other Language Names for Knasibfite
Simplified Chinese:氟硼硅钾钠石
Related Minerals - Nickel-Strunz Grouping
| 3.CH.05 | Malladrite | Na2[SiF6] | Trig. |
| 3.CH.10 | Bararite | (NH4)2[SiF6] | Trig. 3m (3 2/m) |
| 3.CH.15 | Cryptohalite | (NH4)2[SiF6] | Iso. m3m (4/m 3 2/m) : Fm3m |
| 3.CH.15 | Hieratite | K2[SiF6] | Iso. m3m (4/m 3 2/m) : Fm3m |
| 3.CH.20 | Demartinite | K2[SiF6] | Hex. 6mm : P63mc |
Fluorescence of Knasibfite
Not fluorescent
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:
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 Knasibfite
mindat.org URL:
https://www.mindat.org/min-31406.html
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Localities for Knasibfite
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Italy (TL) | |
| 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. |
La Fossa crater, Vulcano Island, Lipari, Eolie Islands, Messina Province, Sicily, Italy