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

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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 - PrismaticH-M Symbol (2/m) Space Group: C 2/c X Ray Diffraction: By Intensity(I/I_o): 3.01(1), 3.16(0.7), 2.817(0.4), Crystal Structure:

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Smith G W , Walls R , Zeitschrift fur Kristallographie , 151 (1980) p.49-60, The crystal structure of goergeyite K2SO4*5CaSO4*H2O, Locality: Astakos, Greece View Additional jPOWD Structure files for Gorgeyite [1]

 

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 · 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
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Ask about Gorgeyite here :
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Mineral Discussion Forum from Fabre Minerals - also available in Español

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