Kumtyubeite Mineral Data

General Kumtyubeite Information

Chemical Formula:

Ca5(SiO4)2F2

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

Empirical Formula:

Ca₅(SiO₄)₂F₂

Environment:

Fluorine-dominant counterpart of reinhardbraunsite

IMA Status:

Proposed IMA 2008 (Dana # Added)

Locality:

Kabardino-Balkaria, North Caucasus, Russia Link to MinDat.org Location Data.

Name Origin:

Commission on New Minerals, Nomenclature and Classification (CNMNC)

Synonym:

IMA2008-045

Kumtyubeite Image

Images:

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

Axial Ratios:

a:b:c =2.2608:1:1.7529

Cell Dimensions:

a = 11.434, b = 5.0575, c = 8.8657, Z = 2; beta = 108.86° V = 485.16 Den(Calc)= 2.89

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/I_o): 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

Optical Data:

NCalc= 1.59 - from Gladstone-Dale relationship (KC = 0.2027) where Ncalc=Dcalc*KC+1

Calculated Properties of Kumtyubeite

Electron Density:

Bulk Density (Electron Density)=2.87 gm/cc
note: Specific Gravity of Kumtyubeite =2.89 gm/cc.

Fermion Index:

Fermion Index = 0.0069935602
Boson Index = 0.9930064398

Photoelectric:

PE_Kumtyubeite= 6.39 barns/electron
U=PE_Kumtyubeite x rElectron Density= 18.35 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Kumtyubeite is Not Radioactive

Kumtyubeite Classification

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

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

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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Print or Cut-and-Paste your Kumtyubeite Specimen Label here :

Kumtyubeite

Ca5(SiO4)2F2
Dana No: 52.03.02b.05 Strunz No: 09.AF.45
Locality:

Notes:

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