Koktaite Mineral Data

General Koktaite Information

Chemical Formula: (NH4)2Ca(SO4)2•(H2O) 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 Empirical Formula: (NH₄)₂Ca(SO₄)₂•(H₂O) Environment: Waste heaps of a lignite mine. Pseudomorphous after gypsum. IMA Status: Valid Species (Pre-IMA) 1948 Locality: Zeravice, near Kyjov in southeastern Moravia, Czech Republic. Link to MinDat.org Location Data. Name Origin: Named for Jaroslav Kokta (1904-1970), Czech chemist, who analyzed the artificial compound. Name Pronunciation: Koktaite  

Koktaite Image

Images:

Koktaite Crystallography

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

Physical Properties of Koktaite

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

Optical Properties of Koktaite

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 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

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

Koktaite Classification

Dana Class: 29.03.01.02 (29)Hydrated Acid and Sulfates   (29.03)where (A+)2 B (XO4)2 · x(H2O)   (29.03.01)Dana Group  

29.03.01.01 Syngenite K2Ca(SO4)2•(H2O) P 2₁/m 2/m

 

29.03.01.02 Koktaite (NH4)2Ca(SO4)2•(H2O) P 2₁/m 2/m

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

References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) 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
15 - WWW-MINCRYST
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

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Ask about Koktaite here :
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