Knasibfite
A valid IMA mineral species
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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.
Unique Identifiers
Mindat ID:
31406
Long-form identifier:
mindat:1:1:31406:0
GUID
(UUID V4):
(UUID V4):
d82dbded-b342-419c-8e58-75bdd3c8c63e
IMA Classification of Knasibfite
Approved
IMA Formula:
K3Na4(SiF6)3(BF4)
Approval year:
2006
First published:
2008
Classification of Knasibfite
3.CH.25
3 : HALIDES
C : Complex halides
H : Silicofluorides
3 : HALIDES
C : Complex halides
H : Silicofluorides
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Ksf | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
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
Chemistry of Knasibfite
Mindat 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
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Big Balls | Small Balls | Just Balls | Spacefill
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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) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
45b : [Other oxidized fumarolic minerals] |
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
Common Associates
Associated Minerals Based on Photo Data:
1 photo of Knasibfite associated with Hieratite | K2[SiF6] |
1 photo of Knasibfite associated with Demartinite | K2[SiF6] |
1 photo of Knasibfite associated with Gypsum | CaSO4 · 2H2O |
1 photo of Knasibfite associated with Avogadrite | (K,Cs)[BF4] |
Related Minerals - Strunz-mindat Grouping
3.CH.05 | Malladrite | Na2[SiF6] |
3.CH.10 | Bararite | (NH4)2[SiF6] |
3.CH.15 | Cryptohalite | (NH4)2[SiF6] |
3.CH.15 | Hieratite | K2[SiF6] |
3.CH.20 | Demartinite | K2[SiF6] |
3.CH.30 | Heklaite | KNaSiF6 |
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.
Internet Links for Knasibfite
mindat.org URL:
https://www.mindat.org/min-31406.html
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References for Knasibfite
Localities for Knasibfite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Italy (TL) | |
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La Fossa crater, Vulcano Island, Lipari, Eolie Islands, Metropolitan City of Messina, Sicily, Italy