Mineralogy Database

Jaffeite Mineral Data

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General Jaffeite Information

Help on Chemical  Formula: Chemical Formula: Ca4(Si3O7)(OH)6
Help on Composition: Composition: Molecular Weight = 458.61 gm
   Calcium   34.96 %  Ca   48.91 % CaO
   Silicon   18.37 %  Si   39.30 % SiO2
   Hydrogen   1.32 %  H    11.78 % H2O
   Oxygen    45.35 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca4(Si3O7)(OH)6
Help on Environment: Environment: Naturally occurring analog of "TSH" (Tricalcium Silicate Hydrate), a component of portland cement.
Help on IMA Status: IMA Status: Approved IMA 1989
Help on Locality: Locality: Kombat mine, located 37 km east of Otavi and 49 km south of Tsumeb in the north-central part of Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Howard Jaffe of the University of Massachusetts.
Help on Name Pronunciation: Name Pronunciation: Jaffeite Say JAFFEITE
Help on Synonym: Synonym: ICSD 39725
  PDF 46-1285
 

Jaffeite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.74625
Help on Cell Dimensions: Cell Dimensions: a = 10.026, c = 7.482, Z = 2; V = 651.33 Den(Calc)= 2.34
Help on Crystal System: Crystal System: Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: P 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.66(1), 2.833(0.9), 2.996(0.9),
 

Physical Properties of Jaffeite

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: Colorless.
Help on Density: Density: 2.65
Help on Diaphaneity: Diaphaneity: Transparent
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Jaffeite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.142 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2564,KPDmeas= 0.2264,KC= 0.2245
Ncalc = 1.53 - 1.6
Help on Optical Data: Optical Data: Uniaxial (+), w=1.596, e=1.604, bire=0.0080.
 

Calculated Properties of Jaffeite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.68 gm/cc
note: Specific Gravity of Jaffeite =2.65 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0092714039
Boson Index = 0.9907285961
Help on Photoelectric: Photoelectric: PEJaffeite = 4.97 barns/electron
U=PEJaffeite x rElectron Density= 13.32 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Jaffeite is Not Radioactive
 

Jaffeite Classification

Help on  Dana Class: Dana Class: 55.03.02.01 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions
  (55.03)with cations in [7] coordination
  (55.03.02)Dana Group
 
55.03.02.01 Jaffeite Ca4(Si3O7)(OH)6 P 3 3
Help on  Strunz Class: Strunz Class: 09.BE.12 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
 
09.BE.12 Jaffeite Ca4(Si3O7)(OH)6 P 3 3
 

Other Jaffeite Information

Help on References: References: NAME( MinRec, v 22, p 422) PHYS. PROP.(Am.Min.,Vol.74,p1203-1206,1989) OPTIC PROP.(Am.Min.,Vol.74,p1203-1206,1989)
Help on See Also: See Also: Links to other databases for Jaffeite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Jaffeite

Ca4(Si3O7)(OH)6
Dana No: 55.03.02.01 Strunz No: 09.BE.12
Locality:

 

Notes:

 

 
   
 


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