Gorgeyite Mineral Data

Gorgeyite Mineral Data +

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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)

IMA Status:

Valid Species (Pre-IMA) 1953

Locality:

Link to MinDat.org Location Data.

Synonym:

Goergeyite

Gorgeyite Image

Images:

Gorgeyite

Comments: g?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 - PrismaticH-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),

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

Diaphaniety:

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

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:

r_electron=2.95 gm/cc
note: r_Gorgeyite=2.95 gm/cc.

Fermion Index

Fermion Index = 0.00219
Boson Index = 0.99781

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)

Estimated Radioactivity from Gorgeyite - barely detectable

Gorgeyite Classification

Dana Class:

29.4.7.1 (29)Hydrated Acid and Sulfates

(29.4)where (A+)2 Bn (XO4)p · x(H2O)

(29.4.7)Dana Group

29.4.7.1 Gorgeyite K2Ca5(SO4)6·(H2O) C 2/c 2/m

Strunz Class:

VI/C.20-30 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/C - Water-bearing sulfates without unfamiliar anions. cations of medium and very big size

VI/C.20 - Polyhalite - Görgeyite series

VI/C.20-10 Polyhalite K2Ca2Mg(SO4)4·2(H2O) P 1,P1 Tri

VI/C.20-20 Leightonite K2Ca2Cu(SO4)4·2(H2O) C 2/c 2/m

VI/C.20-30 Gorgeyite K2Ca5(SO4)6·(H2O) C 2/c 2/m

Other Gorgeyite Information

References:

NAME( Athena) 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 -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 - WWW-MINCRYST 13 -École des Mines de Paris

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

Gorgeyite

K2Ca5(SO4)6·(H2O)
Dana No: 29.4.7.1 Strunz No: VI/C.20-30
Locality:

Notes: