Knasibfite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
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
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
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
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Knasibfite
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 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).
All localities listed without proper references should be considered as questionable.
Italy (TL) | |
|
Quick NavTopAbout KnasibfiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
La Fossa crater, Vulcano Island, Lipari, Eolie Islands, Metropolitan City of Messina, Sicily, Italy