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Knasibfite

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, Eolie Islands (Aeolian Islands), Lipari, 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)

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
]
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:

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

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    Localities for Knasibfite

    (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
        • Lipari
          • Eolie Islands (Aeolian Islands)
            • Vulcano Island
    		IMA website - Proposals approved in January 2007; Italo Campostrini list - 2008
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