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Jeffreyite Mineral Data

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General Jeffreyite Information

Help on Chemical  Formula: Chemical Formula: (Ca,Na)2(Be,Al)Si2(O,OH)7
Help on Composition: Composition: Molecular Weight = 255.30 gm
   Sodium      4.50 %  Na    6.07 % Na2O
   Calcium    23.55 %  Ca   32.95 % CaO
   Beryllium   2.65 %  Be    7.35 % BeO
   Aluminum    2.64 %  Al    4.99 % Al2O3
   Silicon    22.00 %  Si   47.07 % SiO2
   Hydrogen    0.79 %  H     7.06 % H2O
   Oxygen     43.87 %  O
             ______        ______ 
             100.00 %      105.48 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca1.5Na0.5Be0.75Al0.25Si2O5(OH)2
Help on Environment: Environment: In a cavity in a highly calcium-metasomatized granite dike.
Help on IMA Status: IMA Status: Approved IMA 1984
Help on Locality: Locality: Jeffrey mine, Asbestos, Quebec, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Jeffreyite + Pronunciation Say JEFFREYITE
Help on Synonym: Synonym: IMA1982-075
 

Jeffreyite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1:1:2.712
Help on Cell Dimensions: Cell Dimensions: a = 14.9, b = 14.9, c = 40.41, Z = 64; V = 8,971.42 Den(Calc)= 3.02
Help on Crystal System: Crystal System: Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: C 2221
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.774(1), 2.993(0.9), 2.541(0.7),
 

Physical Properties of Jeffreyite

Help on Cleavage: Cleavage: {001} Perfect, {110} Perfect
Help on Color: Color: Colorless.
Help on Density: Density: 2.99
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Jeffreyite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.077 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.086 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2107,KPDmeas= 0.2128,KC= 0.2306
Ncalc = 1.69 - 1.7
Help on Optical Data: Optical Data: Biaxial (-), a=1.625, b=1.641, g=1.643, bire=0.0180, 2V(Calc)=38, 2V(Meas)=40.
 

Calculated Properties of Jeffreyite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.99 gm/cc
note: Specific Gravity of Jeffreyite =2.99 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEJeffreyite = 3.89 barns/electron
U=PEJeffreyite x rElectron Density= 11.64 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Jeffreyite is Not Radioactive
 

Jeffreyite Classification

Help on  Dana Class: Dana Class: 55.04.02.03 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions
  (55.04)with cations in [8] and lower coordination
  (55.04.02)Fresnoite group
 
55.04.02.01 Fresnoite Ba2TiSi2O8 P 4bm 4mm
 
55.04.02.02 Hardystonite Ca2ZnSi2O7 P 421m 4 2m
 
55.04.02.03 Jeffreyite (Ca,Na)2(Be,Al)Si2(O,OH)7 C 2221 2 2 2
 
55.04.02.04 Leucophanite (Na,Ca)2BeSi2(O,OH,F)7 P1 1
 
55.04.02.05 Meliphanite (Ca,Na)2Be[(Si,Al)2O6(F,OH)] I 4 4
 
55.04.02.06 Gugiaite Ca2BeSi2O7 P 421m 4 2m
Help on  Strunz Class: Strunz Class: 09.BB.10 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BB -Si2O7 groups, without non-tetrahedral anions;
 
09.BB.10 Akermanite Ca2MgSi2O7 P 421m 4 2m
 
09.BB.10 Cebollite Ca5Al2(SiO4)3(OH)4 Unk Ortho
 
09.BB.10 Gugiaite Ca2BeSi2O7 P 421m 4 2m
 
09.BB.10 Gehlenite Ca2Al(AlSi)O7 P 421m 4 2m
 
09.BB.10 Jeffreyite (Ca,Na)2(Be,Al)Si2(O,OH)7 C 2221 2 2 2
 
09.BB.10 Hardystonite Ca2ZnSi2O7 P 421m 4 2m
 
09.BB.10 Melilite (Ca,Na)2(Al,Mg,Fe)(Si,Al)2O7 P 421m 4 2m
 
09.BB.10 Okayamalite! Ca2B2SiO7 P 421m 4 2m
 

Other Jeffreyite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Jeffreyite :
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

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

Jeffreyite

(Ca,Na)2(Be,Al)Si2(O,OH)7
Dana No: 55.04.02.03 Strunz No: 09.BB.10
Locality:

 

Notes:

 

 
   
 


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