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Knasibfite

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Formula:
K
 
3
Na
 
4
[SiF
 
6
]
 
3
[BF
 
4
]
System:OrthorhombicColour:colourless
Name:Named for its chemical composition (K, Na, Si, B, F).
This page provides mineralogical data about Knasibfite.

Classification of Knasibfite

IMA status:Approved 2006
Nickel-Strunz 10th (pending) edition ID:3.CH.25

3 : HALIDES
C : Complex halides
H : Silicofluorides
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Type Occurrence of Knasibfite

Type Locality:La Fossa crater, Vulcano Island, Lipari, Eolie Islands (Aeolian Islands), Messina Province, Sicily, Italy
Associated Minerals at type locality:
HieratiteDemartiniteAvogadrite

Physical Properties of Knasibfite

Colour:colourless
Density (measured):2.75(1) g/cm3
Density (calculated):2.77 g/cm3

Crystallography of Knasibfite

Crystal System:Orthorhombic
Class (H-M):mm2 - Pyramidal
Space Group:Imm2
Cell Parameters:a = 5.522Å, b = 17.106Å, c = 9.175Å
Ratio:a:b:c = 0.323 : 1 : 0.536
Unit Cell Volume:V 866.7 ų
Z:2
X-Ray Powder Diffraction:
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)

Optical Data of Knasibfite

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

Chemical Properties of Knasibfite

Formula:
K
 
3
Na
 
4
[SiF
 
6
]
 
3
[BF
 
4
]
Simplified for copy/paste:K3Na4[SiF6]3[BF4]
All elements listed in formula:B, F, K, Na, Si

Relationship of Knasibfite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
3.CH.05Malladrite
Na
 
2
[SiF
 
6
]
3.CH.10Bararite
(NH
 
4
)
 
2
[SiF
 
6
]
3.CH.15Cryptohalite
(NH
 
4
)
 
2
[SiF
 
6
]
3.CH.15Hieratite
K
 
2
[SiF
 
6
]
3.CH.20Demartinite
K
 
2
[SiF
 
6
]

Other Names for Knasibfite

Synonyms:
IMA2006-042
Other Languages:
Simplified Chinese:氟硼硅钾钠石

Other Information

Health Warning: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

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Localities for Knasibfite

    The 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. ? 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
     
    • 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.
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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