Knasibfite
This page is currently not sponsored. Click here to sponsor this page.
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
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]
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-spacing | Intensity |
|---|---|
| 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.05 | Malladrite | Na2SiF6 |
| 3.CH.10 | Bararite | (NH4)2SiF6 |
| 3.CH.15 | Cryptohalite | (NH4)2SiF6 |
| 3.CH.15 | Hieratite | K2SiF6 |
| 3.CH.20 | Demartinite | K2SiF6 |
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.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
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.
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) | |
| 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