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Chegemite Mineral Data
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General Chegemite Information
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Chemical Formula: |
Ca7(SiO4)3(OH)2 |
Composition: |
Molecular Weight = 590.81 gm |
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Calcium 47.48 % Ca 66.44 % CaO |
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Silicon 14.26 % Si 30.51 % SiO2 |
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Hydrogen 0.34 % H 3.05 % H2O |
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Oxygen 37.91 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Ca7(SiO4)3(OH)2 |
Environment: |
Humite group |
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: |
IMA2008-038 |
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Chegemite Crystallography
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Axial Ratios: |
a:b:c =0.4448:1:2.0672 |
Cell Dimensions: |
a = 5.0696, b = 11.3955, c = 23.5571, Z = 4; V = 1,360.91 Den(Calc)= 2.88 |
Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbnm |
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), |
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Optical Properties of Chegemite
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Optical Data: |
NCalc= 1.61 - from Gladstone-Dale relationship (KC = 0.2134) where Ncalc=Dcalc*KC+1 |
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Calculated Properties of Chegemite
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Electron Density: |
Bulk Density (Electron Density)=2.89 gm/cc note: Specific Gravity of Chegemite =2.88 gm/cc. |
Fermion Index: |
Fermion Index = 0.0074835127 Boson Index = 0.9925164873 |
Photoelectric: |
PEChegemite = 6.35 barns/electron U=PEChegemite x rElectron Density= 18.33 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Chegemite is Not Radioactive |
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Chegemite Classification
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Dana Class: |
52.03.02c.04 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O |
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(52.03)with cations in [6] coordination only |
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(52.03.02c)Humite group (Humite series) |
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52.03.02c.01 Humite (Mg,Fe)7(SiO4)3(F,OH)2 P nma 2/m 2/m 2/m |
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52.03.02c.02 Leucophoenicite Mn7(SiO4)3(OH)2 P 21/a 2/m |
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52.03.02c.03 Manganhumite (Mn,Mg)7(SiO4)3(OH)2 Pbnm 2/m 2/m 2/m |
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52.03.02c.04 Chegemite! Ca7(SiO4)3(OH)2 Pbnm 2/m 2/m 2/m |
Strunz Class: |
09.AF.50 09 - SILICATES (Germanates) |
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09.A - Nesosilicates |
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09.AF -Nesosilicates with additional anions; |
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09.AF.50 Manganhumite (Mn,Mg)7(SiO4)3(OH)2 Pbnm 2/m 2/m 2/m |
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09.AF.50 Humite (Mg,Fe)7(SiO4)3(F,OH)2 P nma 2/m 2/m 2/m |
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09.AF.50 Chegemite! Ca7(SiO4)3(OH)2 Pbnm 2/m 2/m 2/m |
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Other Chegemite Information
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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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Print or Cut-and-Paste your Chegemite Specimen Label here :
Chegemite
Ca7(SiO4)3(OH)2
Dana No: 52.03.02c.04 Strunz No: 09.AF.50
Locality:
Notes:
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