Hieratite Mineral Data

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.

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 - HexoctahedralH-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

Diaphaniety:

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

Gladstone-Dale:

CI meas= 0.226 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.228 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1273,KPDmeas= 0.1276,KC= 0.1649

Optical Data:

Isotropic, n=1.34.

Calculated Properties of Hieratite

Electron Density:

r_electron=2.56 gm/cc
note: r_Hieratite=2.67 gm/cc.

Fermion Index

Fermion Index = 0.00599
Boson Index = 0.99401

Photoelectric:

PE_Hieratite= 4.39 barns/electron
U=PE_Hieratite x r_electron= 11.25 barns/cc.

Radioactivity:

GRapi = 492.95 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Hieratite - barely detectable

Hieratite Classification

Dana Class:

11.5.1.1. (11)Halide Complexes; Alumino-fluorides

(11.5)where (A)m B (X)6

(11.5.1)Dana Group

11.5.1.1. Hieratite K2SiF6 F m3m 4/m 3 2/m

11.5.1.2 Cryptohalite (NH4)2SiF6 F m3m 4/m 3 2/m

Strunz Class:

III/B.02-20 III - Halogenides

III/B - Double halogenides without water, with [BF4]1-,[SiF6]2- and [AlF6]3-

III/B.02 - Mallardite - Bararite series

III/B.02-10 Malladrite Na2SiF6 P 3₂1 3 2

III/B.02-20 Hieratite K2SiF6 F m3m 4/m 3 2/m

III/B.02-30 Cryptohalite (NH4)2SiF6 F m3m 4/m 3 2/m

III/B.02-40 Bararite (NH4)2SiF6 R 3m 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

Search for Hieratite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Hieratite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Hieratite Mineral Data :

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 Español

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

Hieratite

K2SiF6
Dana No: 11.5.1.1. Strunz No: III/B.02-20
Locality:

Notes: