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Koktaite Mineral Data

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General Koktaite Information

Help on Chemical  Formula: Chemical Formula: (NH4)2Ca(SO4)2•(H2O)
Help on Composition: Composition: Molecular Weight = 286.30 gm
   Calcium   14.00 %  Ca   19.59 % CaO
   Hydrogen   2.82 %  H      -   % Calc as (NH4)2O
   Hydrogen   0.70 %  H     6.29 % H2O
   Sulfur    22.40 %  S    55.93 % SO3
   Nitrogen   9.78 %  N    18.19 % (NH4)2O
   Oxygen    50.30 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (NH4)2Ca(SO4)2•(H2O)
Help on Environment: Environment: Waste heaps of a lignite mine. Pseudomorphous after gypsum.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1948
Help on Locality: Locality: Zeravice, near Kyjov in southeastern Moravia, Czech Republic. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Jaroslav Kokta (1904-1970), Czech chemist, who analyzed the artificial compound.
Help on Name Pronunciation: Name Pronunciation: Koktaite Say KOKTAITE

Koktaite Image

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Comments: Tan to white scaly coating of koktaite.
Location: Zastavka, near Brna, Vychodocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Koktaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.887:1:1.4164
Help on Cell Dimensions: Cell Dimensions: a = 6.324, b = 7.129, c = 10.098, Z = 2; beta = 102.58° V = 444.33 Den(Calc)= 2.14
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.83(1), 3.3(0.65), 4.96(0.4),

Physical Properties of Koktaite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.09
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Water Soluble - Water soluble mineral.
Help on Streak: Streak: white

Optical Properties of Koktaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.572 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.535 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.248,KPDmeas= 0.2539,KC= 0.1615
Ncalc = 1.34 - 1.35
Help on Optical Data: Optical Data: Biaxial (-), a=1.524, b=1.532, g=1.536, bire=0.0120, 2V(Calc)=70, 2V(Meas)=72.

Calculated Properties of Koktaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.21 gm/cc
note: Specific Gravity of Koktaite =2.14 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.09
Boson Index = 0.91
Help on Photoelectric: Photoelectric: PEKoktaite = 3.04 barns/electron
U=PEKoktaite x rElectron Density= 6.73 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Koktaite is Not Radioactive

Koktaite Classification

Help on  Dana Class: Dana Class: (29)Hydrated Acid and Sulfates
  (29.03)where (A+)2 B (XO4)2 � x(H2O)
  (29.03.01)Dana Group Syngenite K2Ca(SO4)2•(H2O) P 21/m 2/m Koktaite (NH4)2Ca(SO4)2•(H2O) P 21/m 2/m
Help on  Strunz Class: Strunz Class: 07.CD.35 07 - SULFATES (SELENATES, TELLURATES)
  07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O
  07.CD -With only large cations
07.CD.35 Koktaite (NH4)2Ca(SO4)2•(H2O) P 21/m 2/m
07.CD.35 Syngenite K2Ca(SO4)2•(H2O) P 21/m 2/m

Other Koktaite Information

Help on References: References: NAME( Dana8) 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 Koktaite :
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.35





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