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Görgeyite

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Kazakhstan
© Rob Lavinsky

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Formula:
K
 
2
Ca
 
5
(SO
 
4
)
 
6
 · H
 
2
O
System:MonoclinicColour:Colorless to yellowish.
Lustre:VitreousHardness:3½
Name:Named for Rolf von Görgey (1886-1915), Austrian mineralogist.
This page provides mineralogical data about Görgeyite.

Classification of Görgeyite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Nickel-Strunz 10th (pending) edition ID:7.CD.30

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
D : With only large cations
Dana 7th edition ID:29.4.7.1
Dana 8th edition ID:29.4.7.1

29 : HYDRATED ACID AND NORMAL SULFATES
4 : AmBn(XO4)p·xH2O, with (m+n):p < 3:2 and > 1:1
Hey's CIM Ref.:25.4.9

25 : Sulphates
4 : Sulphates of Ca, Sr and Ba
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Type Occurrence of Görgeyite

Type Locality:Ischler Salzberg, Perneck, Bad Ischl, Upper Austria, Austria

Physical Properties of Görgeyite

Lustre:Vitreous
Colour:Colorless to yellowish.
Streak:(not reported)
Hardness (Mohs):3½

Crystallography of Görgeyite

Crystal System:Monoclinic

Optical Data of Görgeyite

Type:Biaxial (+)
RI values: nα = 1.560 nβ = 1.569 nγ = 1.584
2V:Measured: 79° , Calculated: 78°
Maximum Birefringence:δ = 0.024

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:none

Chemical Properties of Görgeyite

Formula:
K
 
2
Ca
 
5
(SO
 
4
)
 
6
 · H
 
2
O
Essential elements:Ca, H, K, O, S
All elements listed in formula:Ca, H, K, O, S

Relationship of Görgeyite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.CD.05Matteuccite
NaHSO
 
4
 · H
 
2
O
7.CD.10Mirabilite
Na
 
2
SO
 
4
 · 10H
 
2
O
7.CD.15Lecontite
(NH
 
4
,K)NaSO
 
4
 · 2H
 
2
O
7.CD.20Hydroglauberite
Na
 
10
Ca
 
3
(SO
 
4
)
 
8
 · 6H
 
2
O
7.CD.25Eugsterite
Na
 
4
Ca(SO
 
4
)
 
3
 · 2H
 
2
O
7.CD.35Koktaite
(NH
 
4
)
 
2
Ca(SO
 
4
)
 
2
 · H
 
2
O
7.CD.35Syngenite
K
 
2
Ca(SO
 
4
)
 
2
 · H
 
2
O
7.CD.40Gypsum
CaSO
 
4
 · 2H
 
2
O
7.CD.45Bassanite
CaSO
 
4
 · 0.5H
 
2
O
7.CD.50Zircosulfate
(Zr,Ti)(SO
 
4
)
 
2
 · 4H
 
2
O
7.CD.55Schieffelinite
Pb
 
8
(TeO
 
4
)
 
5
(SO
 
4
)
 
3
 · 8H
 
2
O
7.CD.60Montanite
Bi
 
2
(TeO
 
6
) · 2H
 
2
O
7.CD.65Omongwaite
Na
 
2
Ca
 
5
(SO
 
4
)
 
6
 · 3H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
25.4.1Anhydrite
CaSO
 
4
25.4.2Bassanite
CaSO
 
4
 · 0.5H
 
2
O
25.4.3Gypsum
CaSO
 
4
 · 2H
 
2
O
25.4.4Glauberite
Na
 
2
Ca(SO
 
4
)
 
2
25.4.5Cesanite
Na
 
3
Ca
 
2
(SO
 
4
)
 
3
(OH)
25.4.6Eugsterite
Na
 
4
Ca(SO
 
4
)
 
3
 · 2H
 
2
O
25.4.7Hydroglauberite
Na
 
10
Ca
 
3
(SO
 
4
)
 
8
 · 6H
 
2
O
25.4.8Syngenite
K
 
2
Ca(SO
 
4
)
 
2
 · H
 
2
O
25.4.10Polyhalite
K
 
2
Ca
 
2
Mg(SO
 
4
)
 
4
 · 2H
 
2
O
25.4.11Koktaite
(NH
 
4
)
 
2
Ca(SO
 
4
)
 
2
 · H
 
2
O
25.4.12Ye'elimite
Ca
 
4
Al
 
6
(SO
 
4
)O
 
12
25.4.13Ettringite
Ca
 
6
Al
 
2
(SO
 
4
)
 
3
(OH)
 
12
 · 26H
 
2
O
25.4.14Bentorite
Ca
 
6
(Cr
3+
 
,Al)
 
2
(SO
 
4
)
 
3
(OH)
 
12
 · 26H
 
2
O
25.4.15Celestine
SrSO
 
4
25.4.16Kalistrontite
K
 
2
Sr(SO
 
4
)
 
2
25.4.17Baryte
BaSO
 
4

Other Names for Görgeyite

Synonyms:
GoergyiteMikheeviteMikheyevite
Other Languages:
German:Goergyit
Görgeyit
Micheevit
Mikheevit
Mikheyevit
Russian:Гергейит
Spanish:Goergyita
Görgeyita
Mikheevita
Mikheyevita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Görgeyite

Reference List:

- +
Hayrhofer, H. (1953): Görgeyit, ein neues Mineral aus der Ischler Salzlagerstätte. Neues Jahrbuch für Mineralogie, Monatshefte, 1953, 35-44.

American Mineralogist: 39: 403.

Mukhtarova, N. N., Kalinin, V. R., Rastsvetaeva, R. K., Ilyukhin, V. V., Belov, N. V. (1980): Crystal structure of görgeyite K2Ca5(SO4)6·(H2O). Doklady Akademii Nauk SSSR, 52, 102-105.

Smith, G. W. & Walls, R. (1980): The crystal structure of görgeyite K2SO4·5CaSO4·H2O. Zeitschrift für Kristallographie, 151, 49-60.

Keqin Cai, Dejun Zhao, Linzhi Liao, and Xinhua Huang (1985): The Mineralogy of Gorgeyite. Journal of China University of Geoscience 10(4), 21-28 (in Chinese with English abstract).

Kloprogge, J. T., Hickey, L., Duong, L. V., Martens, W. N., Frost, R. L. (2004): Synthesis and characterization of K2Ca5(SO4)6·H2O, the equivalent of görgeyite, a rare evaporite mineral. American Mineralogist, 89, 266-272.

Internet Links for Görgeyite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Görgeyite details from Handbook of Mineralogy (PDF)
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    • Localities for Görgeyite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Austria
     
    • Upper Austria
      • Bad Ischl
        • Perneck
    		N.Jahrb.Min.,Mh.(1953), 35-44
    China
     
    • Hubei Province
      • Wuhan Prefecture
        • Jianghan District
    		Anthony, J.W. et al.: Handbook of Mineralogy
    • Sichuan Province
      • Dazhou Prefecture
        • Qu Co.
    		Keqin Cai, Dejun Zhao, Linzhi Liao, and Xinhua Huang (1985): Journal of China University of Geoscience 10(4), 21-28; Min Mo (1987): Acta Mineralogica Sinica 7(2), 154-158
    Germany
     
    • North Rhine-Westphalia
      • Aachen
        • Alsdorf
    		U. Kolitsch (unpubl. data on material collected by Frank de Wit)
    Italy
     
    • Latium
      • Rome Province
        • Bracciano Lake
          • Cesano geothermal field
    		Mineralogical Magazine 1981 44 : 269-273.
    • Sicily
      • Messina Province
        • Lipari
          • Eolie Islands (Aeolian Islands)
            • Vulcano Island
    		Campostrini, I., Demartin, F., Gramaccioli, C. M. & Russo, M. (2011): Vulcano - Tre secoli di mineralogia. Associazione Micro-mineralogia Italiana, Cremona, Italy, 344 pp.
    Kazakhstan
     
    • Atyrau Province (Atyrau Oblysy; Atyrau Oblast')
      • Atyrau (Gur'yev)
    		Pavel M. Kartashov data
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