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Koktaite

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About KoktaiteHide

Formula:
(NH4)2Ca(SO4)2 · H2O
Colour:
Colourless, white.
Specific Gravity:
2.09
Crystal System:
Monoclinic
Name:
Named in honor of Jaroslav Kokta (29 April 1904, Skorotice, Austria-Hungary - 2 August 1970, Ostrava, Czechoslovakia), chemist at the Masarykov University, Brno, Czechoslovakia who analyzed the artificial compound.
This page provides mineralogical data about Koktaite.


Classification of KoktaiteHide

Approved, 'Grandfathered' (first described prior to 1959)
7.CD.35

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
D : With only large cations
29.3.1.2

29 : HYDRATED ACID AND NORMAL SULFATES
3 : A2B(XO4)2·xH2O
25.4.11

25 : Sulphates
4 : Sulphates of Ca, Sr and Ba

Physical Properties of KoktaiteHide

Transparency:
Transparent, Translucent
Colour:
Colourless, white.
Cleavage:
None Observed
Density:
2.09 g/cm3 (Measured)    

Optical Data of KoktaiteHide

Type:
Biaxial (-)
RI values:
nα = 1.524 nβ = 1.532 nγ = 1.536
2V:
Measured: 72° , Calculated: 70°
Max Birefringence:
δ = 0.012
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r > v

Chemical Properties of KoktaiteHide

Formula:
(NH4)2Ca(SO4)2 · H2O

Crystallography of KoktaiteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 10.17 Å, b = 7.15 Å, c = 6.34 Å
β = 102.75°
Ratio:
a:b:c = 1.422 : 1 : 0.887
Unit Cell V:
449.65 ų (Calculated from Unit Cell)
Morphology:
Crystals acicular or fibrous-lamellar.
Twinning:
On {100}, common.

Type Occurrence of KoktaiteHide

General Appearance of Type Material:
Pseudomorphs after gypsum.
Geological Setting of Type Material:
Waste piles of a lignite mine.
Associated Minerals at Type Locality:

Synonyms of KoktaiteHide

Other Language Names for KoktaiteHide

German:Koktait
Spanish:Koktaita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Mascagnite1 photo of Koktaite associated with Mascagnite on mindat.org.
Gypsum1 photo of Koktaite associated with Gypsum on mindat.org.
Anhydrite1 photo of Koktaite associated with Anhydrite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

7.CD.Campostriniite(Bi3+,Na)3(NH4,K)2Na2(SO4)6·H2OMon. 2/m : B2/b
7.CD.05MatteucciteNaHSO4 · H2OMon.
7.CD.10MirabiliteNa2SO4 · 10H2OMon. 2/m
7.CD.15Lecontite(NH4,K)NaSO4 · 2H2OOrth. 2 2 2 : P21 21 21
7.CD.20HydroglauberiteNa10Ca3(SO4)8 · 6H2OMon.
7.CD.25EugsteriteNa4Ca(SO4)3 · 2H2OMon.
7.CD.30GörgeyiteK2Ca5(SO4)6 · H2OMon.
7.CD.35SyngeniteK2Ca(SO4)2 · H2OMon. 2/m : P21/m
7.CD.40GypsumCaSO4 · 2H2OMon. 2/m
7.CD.45BassaniteCaSO4 · 0.5H2OMon. 2 : B2
7.CD.50Zircosulfate(Zr,Ti)(SO4)2 · 4H2OOrth.
7.CD.55SchieffelinitePb10Te6+6O20(OH)14(SO4)(H2O)5Orth. mmm (2/m 2/m 2/m) : Cmcm
7.CD.60MontaniteBi2(TeO6) · 2H2O
7.CD.65OmongwaiteNa2Ca5(SO4)6 · 3H2OMon. 2 : B2

Related Minerals - Dana Grouping (8th Ed.)Hide

29.3.1.1SyngeniteK2Ca(SO4)2 · H2OMon. 2/m : P21/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

25.4.1AnhydriteCaSO4Orth. mmm (2/m 2/m 2/m)
25.4.2BassaniteCaSO4 · 0.5H2OMon. 2 : B2
25.4.3GypsumCaSO4 · 2H2OMon. 2/m
25.4.4GlauberiteNa2Ca(SO4)2Mon. 2/m : B2/b
25.4.5CesaniteNa3Ca2(SO4)3(OH)Hex.
25.4.6EugsteriteNa4Ca(SO4)3 · 2H2OMon.
25.4.7HydroglauberiteNa10Ca3(SO4)8 · 6H2OMon.
25.4.8SyngeniteK2Ca(SO4)2 · H2OMon. 2/m : P21/m
25.4.9GörgeyiteK2Ca5(SO4)6 · H2OMon.
25.4.10PolyhaliteK2Ca2Mg(SO4)4 · 2H2OTric. 1
25.4.12Ye'elimiteCa4Al6(SO4)O12Iso.
25.4.13EttringiteCa6Al2(SO4)3(OH)12 · 26H2OTrig. 3m : P3 1c
25.4.14BentoriteCa6(Cr3+,Al)2(SO4)3(OH)12 · 26H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
25.4.15CelestineSrSO4Orth. mmm (2/m 2/m 2/m) : Pnma
25.4.16KalistrontiteK2Sr(SO4)2Trig.
25.4.17BaryteBaSO4Orth. mmm (2/m 2/m 2/m) : Pnma

Other InformationHide

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

References for KoktaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Sekanina, J. (1948) Koktait, nový nerost ze skupiny syngenitové. Acta Academiae Scientiarum Naturaliuim Moravo-Silesiacae: 20: 1-26.
Fleischer, M. (1949) New mineral names. American Mineralogist: 34: 618-620.
Palache, C., Berman, H., and Frondel, C. (1951) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 444.
Periodico di Mineralogia (1985): 54: 29.

Internet Links for KoktaiteHide

Localities for KoktaiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Czech Republic
 
  • South Moravia Region
    • Brno (Brünn)
Dr. Jaroslav Hyrsl labels
Acta Acad.Sci.Nat. Moravo-Silesia (1948) 20, 1-26
Germany
 
  • Thuringia
    • Gera
      • Ronneburg U deposit
T. Witzke & F. Rüger: Lapis 1998(7/8), 26-64
Hungary
 
  • Baranya Co.
    • Mecsek Mts
      • Pécs
Szakáll, S. & Kristály, F. (2008): Ammonium sulphates from burning coal dumps at Komló and Pécs-Vasas, Mecsek Mts., South Hungary. Mineralogia, Special Papers, Vol. 32 (2nd Central-European Mineralogical Conference 2008 (CEMC)), 154.
  • Borsod-Abaúj-Zemplén Co.
    • Bükk Mts
      • Miskolc
ACTA MIN. PETR. Suppl. Tomus XXXVIII., 1997
New Zealand
 
  • North Island
    • Manawatu-Wanganui Region
      • Ruapehu District
        • Tongariro National Park
Johnstone, R.D. (1979) Fumarole Incrustations and Some Aspects of the Thermal Alteration at Ketetahi, Mount Tongariro, New Zealand. Geothermal Institute, University of Auckland, New Zealand.
Poland
 
  • Upper Silesia (Śląskie)
    • Upper Silesian Coal Basin
      • Rybnik Coal Area
Ł. Kruszewski PXRD data
Russia
 
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast
Cesnokov, B., Kotrly, M. and Nisanbajev, T. (1998): Brennende Abraumhalden und Aufschlüsse im Tscheljabinsker Kohlenbecken - eine reiche Mineralienküche. Mineralien-Welt, 9 (3), 54-63 (in German).
USA
 
  • California
    • Imperial Co.
      • Salton Sea
        • Mullet Island
Adams, P., & Lynch, D. (2014). A mineralogical inventory of geothermal features southeast of the Salton Sea, Imperial County, California. Trough to trough: The Colorado River and the Salton Sea (Reynolds, R, 39-43.
Adams, P., & Lynch, D. (2014). A mineralogical inventory of geothermal features southeast of the Salton Sea, Imperial County, California. Trough to trough: The Colorado River and the Salton Sea (Reynolds, R, 39-43.
Venezuela
 
  • Miranda
Urbani, 1997. Bol. Soc. Venezolana de Espeleología, no.30.
Franco Urbani (2009) Venezuelan Cave Minerals: Second Review. Mineralogy 1 2009 ICS Proceedings. In 15th International Congress of Speleology. p 345
Mineral and/or Locality  
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