Mineralogy Database

Chegemite Mineral Data

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General Chegemite Information

Help on Chemical  Formula: Chemical Formula: Ca7(SiO4)3(OH)2
Help on Composition: Composition: Molecular Weight = 590.81 gm
   Calcium   47.48 %  Ca   66.44 % CaO
   Silicon   14.26 %  Si   30.51 % SiO2
   Hydrogen   0.34 %  H     3.05 % H2O
   Oxygen    37.91 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca7(SiO4)3(OH)2
Help on Environment: Environment: Humite group
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: IMA2008-038

Chegemite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4448:1:2.0672
Help on Cell Dimensions: Cell Dimensions: a = 5.0696, b = 11.3955, c = 23.5571, Z = 4; V = 1,360.91 Den(Calc)= 2.88
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbnm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.91(1), 2.728(0.74), 3.041(0.65),2.837(0.6), 2.52(0.59), 2.557(0.43), 5.611(0.43), 3.646(0.41),

Optical Properties of Chegemite

Help on Optical Data: Optical Data: NCalc= 1.61 - from Gladstone-Dale relationship (KC = 0.2134) where Ncalc=Dcalc*KC+1

Calculated Properties of Chegemite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.89 gm/cc
note: Specific Gravity of Chegemite =2.88 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0074835127
Boson Index = 0.9925164873
Help on Photoelectric: Photoelectric: PEChegemite = 6.35 barns/electron
U=PEChegemite x rElectron Density= 18.33 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chegemite is Not Radioactive

Chegemite Classification

Help on  Dana Class: Dana Class: 52.03.02c.04 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.03)with cations in [6] coordination only
  (52.03.02c)Humite group (Humite series)
52.03.02c.01 Humite (Mg,Fe)7(SiO4)3(F,OH)2 P nma 2/m 2/m 2/m
52.03.02c.02 Leucophoenicite Mn7(SiO4)3(OH)2 P 21/a 2/m
52.03.02c.03 Manganhumite (Mn,Mg)7(SiO4)3(OH)2 Pbnm 2/m 2/m 2/m
52.03.02c.04 Chegemite! Ca7(SiO4)3(OH)2 Pbnm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.AF.50 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AF -Nesosilicates with additional anions;
09.AF.50 Manganhumite (Mn,Mg)7(SiO4)3(OH)2 Pbnm 2/m 2/m 2/m
09.AF.50 Humite (Mg,Fe)7(SiO4)3(F,OH)2 P nma 2/m 2/m 2/m
09.AF.50 Chegemite! Ca7(SiO4)3(OH)2 Pbnm 2/m 2/m 2/m

Other Chegemite Information

Help on See Also: See Also: Links to other databases for Chegemite :
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: 52.03.02c.04 Strunz No: 09.AF.50