Mineralogy Database

Kumtyubeite Mineral Data

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General Kumtyubeite Information

Help on Chemical  Formula: Chemical Formula: Ca5(SiO4)2F2
Help on Composition: Composition: Molecular Weight = 422.55 gm
   Calcium   47.42 %  Ca   66.36 % CaO
   Silicon   13.29 %  Si   28.44 % SiO2
   Oxygen    30.29 %  O
   Fluorine   8.99 %  F     8.99 % F
               -   %   F    -3.79 % -O=F2    
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca5(SiO4)2F2
Help on Environment: Environment: Fluorine-dominant counterpart of reinhardbraunsite
Help on IMA Status: IMA Status: Proposed IMA 2008 (Dana # Added)
Help on Locality: Locality: Kabardino-Balkaria, North Caucasus, Russia Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Commission on New Minerals, Nomenclature and Classification (CNMNC)
Help on Synonym: Synonym: IMA2008-045

Kumtyubeite Image

Click Here for Larger   Image in a New Browser Window Images:
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  Kumtyubeite   Srebrodolskite   Wadalite   Rondorfite

Comments: BSE image of kumtyubeite (Kmt) associated with srebrodolskite (Srb), bultfonteinite (Blt), Ca- kydrosilicates, wadalite (Wad), rondorfite (Rndr), and ettringite (dark gray). (AmMin, v94:1361).
Location: Rock-forming mineral found in skarn carbonate-xenoliths in ignimbrites of the Upper Chegem volcanic structure, Kabardino-Balkaria, Northern Caucasus, Russia. Scale: See Image.
© American Mineralogist

Kumtyubeite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.2608:1:1.7529
Help on Cell Dimensions: Cell Dimensions: a = 11.434, b = 5.0575, c = 8.8657, Z = 2; beta = 108.86° V = 485.16 Den(Calc)= 2.89
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.904(1), 1.659(0.63), 3.034(0.62),1.895(0.46), 3.327(0.45), 5.422(0.38), 2.941(0.35), 2.773(0.33),

Optical Properties of Kumtyubeite

Help on Optical Data: Optical Data: NCalc= 1.59 - from Gladstone-Dale relationship (KC = 0.2027) where Ncalc=Dcalc*KC+1

Calculated Properties of Kumtyubeite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.87 gm/cc
note: Specific Gravity of Kumtyubeite =2.89 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0069935602
Boson Index = 0.9930064398
Help on Photoelectric: Photoelectric: PEKumtyubeite = 6.39 barns/electron
U=PEKumtyubeite x rElectron Density= 18.35 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Kumtyubeite is Not Radioactive

Kumtyubeite Classification

Help on  Dana Class: Dana Class: 52.03.02b.05 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.03)with cations in [6] coordination only
  (52.03.02b)Humite group (Chondrodite series)
52.03.02b.01 Alleghanyite Mn5(SiO4)2(OH)2 P 21/a 2/m
52.03.02b.02 Chondrodite (Mg,Fe)5(SiO4)2(F,OH)2 P 21/c 2/m
52.03.02b.03 Reinhardbraunsite Ca5(SiO4)2(OH,F)2 P 21/a 2/m
52.03.02b.04 Ribbeite (Mn,Mg)5(SiO4)2(OH)2 P nma 2/m 2/m 2/m
52.03.02b.05 Kumtyubeite! Ca5(SiO4)2F2 P 21/a 2/m
Help on  Strunz Class: Strunz Class: 09.AF.45 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AF -Nesosilicates with additional anions;
09.AF.45 Alleghanyite Mn5(SiO4)2(OH)2 P 21/a 2/m
09.AF.45 Chondrodite (Mg,Fe)5(SiO4)2(F,OH)2 P 21/c 2/m
09.AF.45 Reinhardbraunsite Ca5(SiO4)2(OH,F)2 P 21/a 2/m
09.AF.45 Kumtyubeite! Ca5(SiO4)2F2 P 21/a 2/m

Other Kumtyubeite Information

Help on See Also: See Also: Links to other databases for Kumtyubeite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: 52.03.02b.05 Strunz No: 09.AF.45





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