Demartinite Mineral Data

Demartinite Mineral Data
Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images Share
      News Help About


General Demartinite Information

Help on Chemical Formula: Chemical Formula: K2[SiF6]
Help on Composition: Composition: Molecular Weight = 220.26 gm
   Potassium  35.50 %  K    42.77 % K2O
   Sodium      0.21 %  Na    0.28 % Na2O
   Silicon    12.62 %  Si   27.01 % SiO2
   Fluorine   51.67 %  F    51.67 % F
                -   %   F   -21.76 % -O=F2    
             ______        ______ 
             100.00 %       99.96 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K2Na0.02Si0.99F5.99
Help on Environment: Environment: Collected in April 2006 from a fumarole at the crater rim. Polymorphous with hieratite.
Help on IMA Status: IMA Status: Approved IMA 2006 (Dana # Added)
Help on Locality: Locality: La Fossa crater, Vulcano, Eolian Islands, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Francesco Demartin (b. 1953), who has made significant contributions to the chemistry of metallic clusters and to the crystal structure of Alpine rare-earth minerals and u ranium minerals.
Help on Synonym: Synonym: IMA2006-034
 

Demartinite Image

Click Here for Larger Demartinite Image in a New Browser Window Images:
Click Here for Larger Demartinite Image

Demartinite

Comments: SEM image of a tapering, hexagonal demartinite crystal. (CanMin, v45:1275).
Location: La Fossa crater, Vulcano, Eolian Islands, Italy.. Scale: See Image.
© Canadian Mineralogist

Demartinite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:1.63514
Help on Cell Dimensions: Cell Dimensions: a = 5.6461, c = 9.2322, Z = 2; V = 254.88 Den(Calc)= 2.87
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal PyramidalH-M Symbol (6mm) Space Group: P 63mc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.301(1), 4.62(0.75), 2.155(0.54),4.32(0.43), 4.9(0.25), 2.358(0.22), 1.909(0.14), 1.403(0.13),
Click Here for Large Demartinite Structure Window Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
 Help on Above


Gramaccioli C M , Campostrini I , The Canadian Mineralogist , 45 (2007) p.1275-1280, Demartinite, a new polymorph of K2SiF6 from La Fossa Crater, Vulcano,, Aeolian Islands, Italy, Locality: La Fossa Crater, Vulcano Island, Aeolian Archipelago, Sicily, Italy

 

Physical Properties of Demartinite

Help on Color: Color: Colorless.
Help on Density: Density: 2.85
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Hexagonal - Six-sided crystal shape in cross-section or habit.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Demartinite

Help on Optical Data: Optical Data: Uniaxial (-), e=1.34, w=1.35, bire=0.0100.
 

Calculated Properties of Demartinite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.76 gm/cc
note: Specific Gravity of Demartinite =2.87 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0059377633
Boson Index = 0.9940622367
Help on Photoelectric: Photoelectric: PEDemartinite = 4.38 barns/electron
U=PEDemartinite x relectron= 12.11 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 492.98 (Gamma Ray American Petroleum Institute Units)
Concentration of Demartinite per GRapi unit = 0.20 (%)

Estimated Radioactivity from Demartinite - barely detectable

 

Demartinite Classification
Help on Dana Class: Dana Class: 11.05.02.03 (11)Halide Complexes; Alumino-fluorides
  (11.05)where (A)m B (X)6
  (11.05.02)Malladrite Group
 
11.05.02.01 Malladrite Na2SiF6 P 321 3 2
 
11.05.02.02 Bararite (NH4)2SiF6 R 3m 3 2/m
 
11.05.02.03 Demartinite! K2[SiF6] P 63mc 6mm
Help on Strunz Class: Strunz Class: 03.CH.20 03 - HALIDES
  03.C - Complex Halides
  03.CH -
 
03.CH.20 Demartinite! K2[SiF6] P 63mc 6mm
 

Other Demartinite Information
Help on References: References: NAME( CanMin, v45:1275) PHYS. PROP.(CanMin, v45:1275) OPTIC PROP.(CanMin, v45:1275)
Help on See Also: See Also: Links to other databases for Demartinite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Demartinite using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Demartinite :

A Bijoux Google Search for Demartinite
Adam's Minerals Google Search for Demartinite
Cape Minerals Google Search for Demartinite
Dakota Matrix Minerals Google Search for Demartinite
Excalibur Mineral Corp. Google Search for Demartinite
Exceptional Minerals Google Search for Demartinite
John Betts Fine Minerals Search for Demartinite
McDougall Minerals Google Search for Demartinite
Mineral News Website Link
Rock and Mineral Shows Google Search for Demartinite
Weinrich Minerals, Inc. Google Search for Demartinite

Ask about Demartinite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

Print or Cut-and-Paste your Demartinite Specimen Label here :

Demartinite

K2[SiF6]
Dana No: 11.05.02.03 Strunz No: 03.CH.20
Locality:

 

Notes: