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Julgoldite-(Fe++) Mineral Data

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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.
Help on Name Pronunciation: Name Pronunciation: Julgoldite-(Fe++) + Pronunciation Say JULGOLDITE-(FE++)
 

Julgoldite-(Fe++) Image

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  Julgoldite-(Fe++)

Comments: Black julgodite-(Fe) and doubly-terminated, brilliant, water clear fluorapophyllite crystals on basalt.
Location: Jalgaon, Maharashtra, India. Scale: 20 x 13 x 5 cm.
© Fabre Minerals

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 - Prismatic H-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 Diaphaneity: Diaphaneity: Translucent
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Sub Metallic
 

Optical Properties of Julgoldite-(Fe++)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.056 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.233,KPDmeas= 0.2245,KC= 0.2379
Ncalc = 1.83 - 1.86
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: Bulk Density (Electron Density)=3.43 gm/cc
note: Specific Gravity of Julgoldite-(Fe++) =3.47 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEJulgoldite-(Fe++) = 10.04 barns/electron
U=PEJulgoldite-(Fe++) x rElectron Density= 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: 58.02.02.01 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups
  (58.02)with cations in [6] and higher coordination; single and double groups (n=1,2)
  (58.02.02)Pumpellyite group
 
58.02.02.01 Julgoldite-(Fe++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(OH)2•(H2O) C 2/m 2/m
 
58.02.02.02 Julgoldite-(Fe+++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(O,OH)2•(H2O) A2/m 2/m
 
58.02.02.03 Okhotskite-(Mg)* Ca3(Mg,Mn)(Mn,Al,Fe)(SiO4)(Si2O7)(OH)2•(H2O) Mono
 
58.02.02.04 Okhotskite-(Mn++) Ca2(Mn,Mg)(Mn,Al,Fe)Si3O10(OH)4 A2/m 2/m
 
58.02.02.05 Pumpellyite-(Fe++) Ca2Fe(Al,Fe)2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m
 
58.02.02.06 Pumpellyite-(Fe+++) Ca2FeAl2(SiO4)(Si2O7)(OH,O)2•(H2O) A2/m 2/m
 
58.02.02.07 Pumpellyite-(Mg) Ca2MgAl2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m
 
58.02.02.08 Pumpellyite-(Mn++) Ca2(Mn,Mg)(Al,Mn,Fe)2(SiO4)(Si2O7(OH)2•(H2O) A2/m 2/m
 
58.02.02.09 Shuiskite Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m
 
58.02.02.10 Poppiite! Ca2(V,Fe,Mg)(V,Al)2(Si,Al)3(O,OH)14 C 2/m 2/m
 
58.02.02.11 Pumpellyite-(Al)! Ca2(Al,Fe,Mg)Al2(SiO4)(Si2O7)(OH,O)2•H2O A2/m 2/m
Help on  Strunz Class: Strunz Class: 09.BG.20 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups;
 
09.BG.20 Julgoldite-(Fe++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(OH)2•(H2O) C 2/m 2/m
 
09.BG.20 Julgoldite-(Fe+++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(O,OH)2•(H2O) A2/m 2/m
 
09.BG.20 Pumpellyite-(Fe++) Ca2Fe(Al,Fe)2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m
 
09.BG.20 Okhotskite-(Mg)* Ca3(Mg,Mn)(Mn,Al,Fe)(SiO4)(Si2O7)(OH)2•(H2O) Mono
 
09.BG.20 Okhotskite-(Mn++) Ca2(Mn,Mg)(Mn,Al,Fe)Si3O10(OH)4 A2/m 2/m
 
09.BG.20 Pumpellyite-(Fe+++) Ca2FeAl2(SiO4)(Si2O7)(OH,O)2•(H2O) A2/m 2/m
 
09.BG.20 Pumpellyite-(Mg) Ca2MgAl2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m
 
09.BG.20 Pumpellyite-(Mn++) Ca2(Mn,Mg)(Al,Mn,Fe)2(SiO4)(Si2O7(OH)2•(H2O) A2/m 2/m
 
09.BG.20 Shuiskite Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m
 
09.BG.20 Pumpellyite-(Al)! Ca2(Al,Fe,Mg)Al2(SiO4)(Si2O7)(OH,O)2•H2O A2/m 2/m
 
09.BG.20 Poppiite! Ca2(V,Fe,Mg)(V,Al)2(Si,Al)3(O,OH)14 C 2/m 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 - 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 Julgoldite-(Fe++) Specimen Label here :

Julgoldite-(Fe++)

Ca2Fe++(Fe+++,Al)2(SiO4)(Si2O7)(OH)2•(H2O)
Dana No: 58.02.02.01 Strunz No: 09.BG.20
Locality:

 

Notes:

 

 
   
 


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