Julgoldite-(Fe++) Mineral Data + Say JULGOLDITE-(FE++)

General Julgoldite-(Fe++) Information

Help on Chemical  Formula: Chemical Formula: Ca2Fe++(Fe+++,Al)2(SiO4)(Si2O7)(OH)2·(H2O)
Help on Composition: Composition: Molecular Weight = 545.54 gm
   Calcium   14.69 %  Ca   20.56 % CaO
   Aluminum   2.47 %  Al    4.67 % Al2O3
   Iron      25.59 %  Fe   13.17 % FeO / 21.95 % Fe2O3
   Silicon   15.44 %  Si   33.04 % SiO2
   Hydrogen   0.74 %  H     6.60 % H2O
   Oxygen    41.06 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2Fe2+Fe3+1.5Al0.5(SiO4)(Si2O7)(OH)2·(H2O)
Help on IMA Status: IMA Status: Approved IMA 1971
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named in 1971 by Moore for Julian Royce Goldsmith (1918-), American geochemist, University of Chicago.
 

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Julgoldite-(Fe++) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =3.1956:1:1.4671
Help on Cell Dimensions: Cell Dimensions: a = 19.433, b = 6.081, c = 8.922, Z = 4; beta = 97.6° V = 1,045.07 Den(Calc)= 3.47
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.949(1), 3.831(0.9), 2.572(0.76),
 

Physical Properties of Julgoldite-(Fe++)

Help on Color: Color: Black, Greenish black, Green.
Help on Density: Density: 3.602
Help on Diaphaniety: Diaphaniety: Translucent
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Sub Metallic
 

Optical Properties of Julgoldite-(Fe++)

Help on Optical Data: Optical Data: Biaxial (-), a=1.776, b=1.814, g=1.836, bire=0.0600
 

Calculated Properties of Julgoldite-(Fe++)

Help on Electron Density: Electron Density:

relectron=3.43 gm/cc
note: rJulgoldite-(Fe++) =3.47 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.01303
Boson Index = 0.98697
Help on Photoelectric: Photoelectric:

PEJulgoldite-(Fe++) = 10.04 barns/electron
U=PEJulgoldite-(Fe++) x relectron= 34.44 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Julgoldite-(Fe++) is Not Radioactive

 

Julgoldite-(Fe++) Classification

Help on  Dana Class: Dana Class: 58.2.2.1 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups
  (58.2)with cations in [6] and higher coordination; single and double groups (n=1,2)
  (58.2.2)Pumpellyite group
 
58.2.2.1 Julgoldite-(Fe++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(OH)2·(H2O) C 2/m 2/m
 
58.2.2.2 Julgoldite-(Fe+++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(O,OH)2·(H2O) A2/m 2/m
 
58.2.2.3 Okhotskite-(Mg)* Ca3(Mg,Mn)(Mn,Al,Fe)(SiO4)(Si2O7)(OH)2·(H2O) Mono
 
58.2.2.4 Okhotskite-(Mn++) Ca2(Mn,Mg)(Mn,Al,Fe)Si3O10(OH)4 A2/m 2/m
 
58.2.2.5 Pumpellyite-(Fe++) Ca2Fe(Al,Fe)2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m
 
58.2.2.6 Pumpellyite-(Fe+++) Ca2FeAl2(SiO4)(Si2O7)(OH,O)2·(H2O) A2/m 2/m
 
58.2.2.7 Pumpellyite-(Mg) Ca2MgAl2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m
 
58.2.2.8 Pumpellyite-(Mn++) Ca2(Mn,Mg)(Al,Mn,Fe)2(SiO4)(Si2O7(OH)2·(H2O) A2/m 2/m
 
58.2.2.9 Shuiskite Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m
Help on  Strunz Class: Strunz Class: VIII/C.24-60 VIII - Silicates
  VIII/C - Sorosilicates, mixed structure with [SiO4]2- "inseln" and [Si2O7]6- groups
  VIII/C.24 - Pumpellyite group
 
VIII/C.24-10 Macfallite Ca2(Mn,Al)3(SiO4)(Si2O7)(OH)3 P 21/m 2/m
 
VIII/C.24-20 Sursassite Mn2Al3(SiO4)(Si2O7)(OH)3 P 21/m 2/m
 
VIII/C.24-30 Pumpellyite-(Mg) Ca2MgAl2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m
 
VIII/C.24-40 Pumpellyite-(Fe++) Ca2Fe(Al,Fe)2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m
 
VIII/C.24-42 Pumpellyite-(Fe+++) Ca2FeAl2(SiO4)(Si2O7)(OH,O)2·(H2O) A2/m 2/m
 
VIII/C.24-50 Pumpellyite-(Mn++) Ca2(Mn,Mg)(Al,Mn,Fe)2(SiO4)(Si2O7(OH)2·(H2O) A2/m 2/m
 
VIII/C.24-60 Julgoldite-(Fe++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(OH)2·(H2O) C 2/m 2/m
 
VIII/C.24-61 Julgoldite-(Fe+++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(O,OH)2·(H2O) A2/m 2/m
 
VIII/C.24-70 Shuiskite Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m
 
VIII/C.24-80 Okhotskite-(Mg)* Ca3(Mg,Mn)(Mn,Al,Fe)(SiO4)(Si2O7)(OH)2·(H2O) Mono
 
VIII/C.24-80* Okhotskite-(Mn++) Ca2(Mn,Mg)(Mn,Al,Fe)Si3O10(OH)4 A2/m 2/m
 
VIII/C.24-90 Samfowlerite Ca14Mn3Zn2(Be,Zn)2Be6(SiO4)6(Si2O7)4(OH,F)6 P 21/c 2/m
 

Other Julgoldite-(Fe++) Information

Help on References: References: NAME( Dana8) 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 Julgoldite-(Fe++) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Julgoldite-(Fe++) Specimen Label here :

Julgoldite-(Fe++)

Ca2Fe++(Fe+++,Al)2(SiO4)(Si2O7)(OH)2·(H2O)
Dana No: 58.2.2.1 Strunz No: VIII/C.24-60
Locality:

 

Notes:

 

 
   
 
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