Mineralogy Database

Gorgeyite Mineral Data

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General Gorgeyite Information

Help on Chemical  Formula: Chemical Formula: K2Ca5(SO4)6•(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: K2Ca5(SO4)6•(H2O)
Help on Environment: Environment: Secondary mineral in evaporite deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1953
Help on Locality: Locality: Ischl salt deposit, near Salzburg, Austria. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Rolf von Gorgey (1886-1915), mineralogist specializing in Austrian salt deposits.
Help on Name Pronunciation: Name Pronunciation: Gorgeyite + Pronunciation Say GORGEYITE
Help on Synonym: Synonym: Goergeyite

Gorgeyite Image

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

Gorgeyite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.5592:1:2.6691
Help on Cell Dimensions: Cell Dimensions: a = 17.48, b = 6.83, c = 18.23, Z = 4; beta = 113.3° V = 1,998.95 Den(Calc)= 2.90
Help on Crystal System: 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/Io): 3.01(1), 3.16(0.7), 2.817(0.4),

Physical Properties of Gorgeyite

Help on Color: Color: Colorless, Yellowish.
Help on Density: Density: 2.95
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Vitreous (Glassy)

Optical Properties of Gorgeyite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.95 gm/cc
note: Specific Gravity of Gorgeyite =2.95 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0021938276
Boson Index = 0.9978061724
Help on Photoelectric: Photoelectric: PEGorgeyite = 5.04 barns/electron
U=PEGorgeyite x relectron= 14.84 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: Dana Class: (29)Hydrated Acid and Sulfates
  (29.04)where (A+)2 Bn (XO4)p � x(H2O)
  (29.04.07)Dana Group Gorgeyite K2Ca5(SO4)6•(H2O) C 2/c 2/m Omongwaite! Na2Ca5(SO4)6•3H2O C 2 2
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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

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Dana No: Strunz No: 07.CD.30





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