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Demartinite

Formula:
K
 
2
[SiF
 
6
]
System:Hexagonal
Name:
After Francesco Demartin (born 1953), professor of General and Inorganic Chemistry and Stechiometry at the University of Milan (Italy).
Dimorph of:Hieratite
This page provides mineralogical data about Demartinite.

Classification of Demartinite

IMA status:Approved 2006
Nickel-Strunz 10th (pending) edition ID:3.CH.20

3 : HALIDES
C : Complex halides
H : Silicofluorides
Dana 8th edition ID:11.5.2.3

11 : HALIDE COMPLEXES
5 : AmBX6
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Type Occurrence of Demartinite

Type Locality:La Fossa Crater, Vulcano Island, Eolie Islands (Aeolian Islands), Lipari, Messina Province, Sicily, Italy

Crystallography of Demartinite

Crystal System:Hexagonal
Class (H-M):6mm - Dihexagonal Pyramidal
Space Group:P63mc
Cell Parameters:a = 5.6461Å, c = 9.2322Å
Ratio:a:c = 1 : 1.635
Unit Cell Volume:V 254.88 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
d-spacingIntensity
4.90 (25)
4.62 (75)
4.32 (43)
2.358 (22)
2.301 (100)
2.155 (54)
1.909 (14)

Chemical Properties of Demartinite

Formula:
K
 
2
[SiF
 
6
]
Essential elements:F, K, Si
All elements listed in formula:F, K, Si

Relationship of Demartinite 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.25Knasibfite
K
 
3
Na
 
4
[SiF
 
6
]
 
3
[BF
 
4
]

Other Names for Demartinite

Synonyms:
IMA2006-034
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 Demartinite

Reference List:Gramaccioli, C.M. & Campostrini, I. (2007): Demartinite, a new natural polymorph of K2SiF6 from La Fossa crater, Vulcano, Aeolian Islands, Italy. Canadian Mineralogist, 45, 1275-1280.

Internet Links for Demartinite

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    Localities for Demartinite

    (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
    		GRAMACCIOLI, C.M., CAMPOSTRINI, I. (2007): Demartinite, a new natural polymorph of K2SiF6 from La Fossa crater, Vulcano, Aeolian Islands, Italy. - Canadian Mineralogist - 45, 1275-1280.
    Mineral and/or Locality
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