Hieratite Mineral Data

Hieratite Mineral Data
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General Hieratite Information

Help on Chemical Formula: Chemical Formula: K2SiF6
Help on Composition: Composition: Molecular Weight = 220.27 gm
   Potassium  35.50 %  K    42.76 % K2O
   Silicon    12.75 %  Si   27.28 % SiO2
   Fluorine   51.75 %  F    51.75 % F
                -   %   F   -21.79 % -O=F2    
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K2SiF6
Help on Environment: Environment: Volcanic fumaroles.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1882
Help on Locality: Locality: Crater of Vulcano, Lipari Islands. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locaity in the crater of Vulcano (Greek name , Hiera).
Help on Name Pronunciation: Name Pronunciation: Hieratite + Pronunciation Say HIERATITE
 

Hieratite Image

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

Comments: Opaque white crystalline stalactic aggregate of hieratite.
Location: Shamokin, Northumberland County, Pennsylvania, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Hieratite Crystallography
Help on Cell Dimensions: Cell Dimensions: a = 8.184, Z = 4; V = 548.15 Den(Calc)= 2.67
Help on Crystal System: Crystal System: Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F m3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.699(1), 2.349(0.7), 2.877(0.65),
Click Here for Large Hieratite Structure Window Crystal Structure:

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Hester J R , Maslen E N , Spadaccini N , Ishizawa N , Satow Y , Acta Crystallographica, Section B , 49 (1993) p.967-973, Accurate synchrotron radiation delta rho maps for K2SiF6 and K2PdCl6, Locality: synthetic, Sample: Mo K-alpha

 

Physical Properties of Hieratite

Help on Cleavage: Cleavage: {???} Good, {???} Good, {???} Good
Help on Color: Color: Colorless, White, Gray.
Help on Density: Density: 2.665
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Concretionary - Rounded massive fine-grained materials.
Help on Habit: Habit: Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite).
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: white
 

Optical Properties of Hieratite

Help on Optical Data: Optical Data: Isotropic, n=1.34.
 

Calculated Properties of Hieratite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.57 gm/cc
note: Specific Gravity of Hieratite =2.67 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0059970097
Boson Index = 0.9940029903
Help on Photoelectric: Photoelectric: PEHieratite = 4.39 barns/electron
U=PEHieratite x relectron= 11.27 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 492.95 (Gamma Ray American Petroleum Institute Units)
Concentration of Hieratite per GRapi unit = 0.20 (%)

Estimated Radioactivity from Hieratite - barely detectable

 

Hieratite Classification
Help on Dana Class: Dana Class: 11.05.01.01 (11)Halide Complexes; Alumino-fluorides
  (11.05)where (A)m B (X)6
  (11.05.01)Dana Group
 
11.05.01.01 Hieratite K2SiF6 F m3m 4/m 3 2/m
 
11.05.01.02 Cryptohalite (NH4)2SiF6 F m3m 4/m 3 2/m
Help on Strunz Class: Strunz Class: 03.CH.15 03 - HALIDES
  03.C - Complex Halides
  03.CH -
 
03.CH.15 Cryptohalite (NH4)2SiF6 F m3m 4/m 3 2/m
 
03.CH.15 Hieratite K2SiF6 F m3m 4/m 3 2/m
 

Other Hieratite Information
Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Hieratite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Ask about Hieratite 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 Hieratite Specimen Label here :

Hieratite

K2SiF6
Dana No: 11.05.01.01 Strunz No: 03.CH.15
Locality:

 

Notes: