Hieratite Mineral Data

General Hieratite Information

Chemical Formula:

K2SiF6

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

Empirical Formula:

K₂SiF₆

Environment:

Volcanic fumaroles.

IMA Status:

Valid Species (Pre-IMA) 1882

Locality:

Crater of Vulcano, Lipari Islands. Link to MinDat.org Location Data.

Name Origin:

Named for the locaity in the crater of Vulcano (Greek name , Hiera).

Name Pronunciation:

Hieratite + Pronunciation

Hieratite Image

Images:

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

Cell Dimensions:

a = 8.184, Z = 4; V = 548.15 Den(Calc)= 2.67

Crystal System:

Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F m3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 4.699(1), 2.349(0.7), 2.877(0.65),

Physical Properties of Hieratite

Cleavage:

{???} Good, {???} Good, {???} Good

Color:

Colorless, White, Gray.

Density:

2.665

Diaphaneity:

Transparent

Habit:

Concretionary - Rounded massive fine-grained materials.

Habit:

Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite).

Hardness:

2.5 - Finger Nail

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Hieratite

Optical Data:

Isotropic, n=1.34.

Calculated Properties of Hieratite

Electron Density:

Bulk Density (Electron Density)=2.57 gm/cc
note: Specific Gravity of Hieratite =2.67 gm/cc.

Fermion Index:

Fermion Index = 0.0059970097
Boson Index = 0.9940029903

Photoelectric:

PE_Hieratite= 4.39 barns/electron
U=PE_Hieratite x r_electron= 11.27 barns/cc.

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

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

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

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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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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:

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