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Demartinite

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About DemartiniteHide

04890100014949867316140.jpg
Francesco Demartin
Formula:
K2[SiF6]
Crystal System:
Hexagonal
Name:
After Francesco Demartin (born 1953), professor of General and Inorganic Chemistry and Stechiometry at the University of Milan (Italy).
Dimorph of:
This page provides mineralogical data about Demartinite.


Classification of DemartiniteHide

Approved
Approval Year:
2006
3.CH.20

3 : HALIDES
C : Complex halides
H : Silicofluorides
11.5.2.3

11 : HALIDE COMPLEXES
5 : AmBX6

Chemical Properties of DemartiniteHide

Formula:
K2[SiF6]
IMA Formula:
K2SiF6

Crystallography of DemartiniteHide

Crystal System:
Hexagonal
Class (H-M):
6mm - Dihexagonal Pyramidal
Space Group:
P63mc
Cell Parameters:
a = 5.6461 Å, c = 9.2322 Å
Ratio:
a:c = 1 : 1.635
Unit Cell V:
254.88 ų (Calculated from Unit Cell)

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0006157DemartiniteGramaccioli C M, Campostrini I (2007) Demartinite, a new polymorph of K2SiF6 from La Fossa Crater, Vulcano, Aeolian Islands, Italy The Canadian Mineralogist 45 1275-12802007La Fossa Crater, Vulcano Island, Aeolian Archipelago, Sicily, Italy0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.90 Å(25)
4.62 Å(75)
4.32 Å(43)
2.358 Å(22)
2.301 Å(100)
2.155 Å(54)
1.909 Å(14)
1.403 Å(13)

Type Occurrence of DemartiniteHide

Synonyms of DemartiniteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Demartinite associated with SulphurS8
1 photo of Demartinite associated with HieratiteK2[SiF6]

Related Minerals - Nickel-Strunz GroupingHide

3.CH.05MalladriteNa2[SiF6]Trig.
3.CH.10Bararite(NH4)2[SiF6]Trig. 3m (3 2/m)
3.CH.15Cryptohalite(NH4)2[SiF6]Iso. m3m (4/m 3 2/m) : Fm3m
3.CH.15HieratiteK2[SiF6]Iso. m3m (4/m 3 2/m) : Fm3m
3.CH.25KnasibfiteK3Na4[SiF6]3[BF4]Orth. mm2 : Imm2

Related Minerals - Dana Grouping (8th Ed.)Hide

11.5.2.1MalladriteNa2[SiF6]Trig.
11.5.2.2Bararite(NH4)2[SiF6]Trig. 3m (3 2/m)

Other InformationHide

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 DemartiniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Denaeyer, M.E. & Ledent, D. (1952): Sur la présence de la modification hexagonale de la hieratite (camermanite) dans des incrustations de sels potassiques d'une cheminée d'usine. Bulletin de la Société Française de Minéralogie et de Cristallographie, 75, 231-236.
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 DemartiniteHide

Localities for DemartiniteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Italy (TL)
 
  • Sicily
    • Messina Province
      • Eolie Islands (Aeolian Islands)
        • Lipari
          • 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.
 
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