Gorgeyite Mineral Data

General Gorgeyite Information

Chemical Formula:

K2Ca5(SO4)6•(H2O)

Composition:

Molecular Weight = 872.98 gm

Potassium 8.96 % K 10.79 % K₂O

Calcium 22.95 % Ca 32.12 % CaO

Hydrogen 0.23 % H 2.06 % H₂O

Sulfur 22.04 % S 55.03 % SO₃

Oxygen 45.82 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₂Ca₅(SO₄)₆•(H₂O)

Environment:

Secondary mineral in evaporite deposits.

IMA Status:

Valid Species (Pre-IMA) 1953

Locality:

Ischl salt deposit, near Salzburg, Austria. Link to MinDat.org Location Data.

Name Origin:

Named for Rolf von Gorgey (1886-1915), mineralogist specializing in Austrian salt deposits.

Name Pronunciation:

Gorgeyite + Pronunciation

Synonym:

Goergeyite

Gorgeyite Image

Images:

Gorgeyite

Comments: GÃ¶rgeyite crystal prism.
Location: Lake Inder, Atyrau, Kazakhstan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Gorgeyite Crystallography

Axial Ratios:

a:b:c =2.5592:1:2.6691

Cell Dimensions:

a = 17.48, b = 6.83, c = 18.23, Z = 4; beta = 113.3° V = 1,998.95 Den(Calc)= 2.90

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 3.01(1), 3.16(0.7), 2.817(0.4),

Physical Properties of Gorgeyite

Color:

Colorless, Yellowish.

Density:

2.95

Diaphaneity:

Transparent

Hardness:

3.5 - Copper Penny

Luster:

Vitreous (Glassy)

Optical Properties of Gorgeyite

Gladstone-Dale:

CI meas= -0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1969,KPDmeas= 0.1936,KC= 0.193
Ncalc = 1.56 - 1.57

Optical Data:

Biaxial (+), a=1.56, b=1.569, g=1.584, bire=0.0240, 2V(Calc)=78, 2V(Meas)=79.

Calculated Properties of Gorgeyite

Electron Density:

Bulk Density (Electron Density)=2.95 gm/cc
note: Specific Gravity of Gorgeyite =2.95 gm/cc.

Fermion Index:

Fermion Index = 0.0021938276
Boson Index = 0.9978061724

Photoelectric:

PE_Gorgeyite= 5.04 barns/electron
U=PE_Gorgeyite x r_electron= 14.84 barns/cc.

Radioactivity:

GRapi = 129.09 (Gamma Ray American Petroleum Institute Units)
Concentration of Gorgeyite per GRapi unit = 0.77 (%)

Estimated Radioactivity from Gorgeyite - barely detectable

Gorgeyite Classification

Dana Class:

29.04.07.01 (29)Hydrated Acid and Sulfates

(29.04)where (A+)2 Bn (XO4)p ï¿½ x(H2O)

(29.04.07)Dana Group

29.04.07.01 Gorgeyite K2Ca5(SO4)6•(H2O) C 2/c 2/m

29.04.07.02 Omongwaite! Na2Ca5(SO4)6•3H2O C 2 2

Strunz Class:

07.CD.30 07 - SULFATES (SELENATES, TELLURATES)

07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O

07.CD -With only large cations

07.CD.30 Gorgeyite K2Ca5(SO4)6•(H2O) C 2/c 2/m

Other Gorgeyite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Gorgeyite :
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
15 - WWW-MINCRYST

Search for Gorgeyite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Gorgeyite :

Ask about Gorgeyite 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 Gorgeyite Specimen Label here :

Gorgeyite

K2Ca5(SO4)6•(H2O)
Dana No: 29.04.07.01 Strunz No: 07.CD.30
Locality:

Notes:

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.