Chegemite Mineral Data

General Chegemite Information

Chemical Formula:

Ca7(SiO4)3(OH)2

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

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

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 - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbnm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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

Optical Data:

NCalc= 1.61 - from Gladstone-Dale relationship (KC = 0.2134) where Ncalc=Dcalc*KC+1

Calculated Properties of Chegemite

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:

PE_Chegemite= 6.35 barns/electron
U=PE_Chegemite x rElectron Density= 18.33 barns/cc.

Radioactivity:

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

Chegemite Classification

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

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

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: