Mineralogy Database

Julgoldite-(Fe+++) Mineral Data

Search Webmineral :
  
Advertisment

General Julgoldite-(Fe+++) Information

Help on Chemical  Formula: Chemical Formula: Ca2Fe+++(Fe+++,Al)2(SiO4)(Si2O7)(O,OH)2•(H2O)
Help on Composition: Composition: Molecular Weight = 2,199.83 gm
   Calcium    14.57 %  Ca   20.39 % CaO
   Magnesium   0.22 %  Mg    0.37 % MgO
   Aluminum    1.35 %  Al    2.55 % Al2O3
   Iron       27.16 %  Fe   38.84 % Fe2O3
   Silicon    15.32 %  Si   32.78 % SiO2
   Hydrogen    0.64 %  H     5.73 % H2O
   Oxygen     40.73 %  O
             ______        ______ 
             100.00 %      100.65 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca8Fe3+2.7Al1.1Mg0.2Fe3+8Si12O42(OH)14
Help on Environment: Environment: Fracture filling in hematite-magnetite ore from the Amerika stope at Langban.
Help on IMA Status: IMA Status: Approved IMA 1971
Help on Locality: Locality: Langban, Varmland, Sweden. 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+++)
Help on Synonym: Synonym: Oxyjulgoldite
 

Julgoldite-(Fe+++) Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image

  Julgoldite-(Fe+++)

Comments: Black, prismatic micro-crystals of julgoldite-(Fe+++) in white apophyllite.
Location: Langban mine, Filipstad , Värmland, Sweden. Scale: 5x3mm.
© Tom Loomis / Dakota Matrix

Julgoldite-(Fe+++) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.4671:1:3.1911
Help on Cell Dimensions: Cell Dimensions: a = 8.8879, b = 6.058, c = 19.3321, Z = 1; beta = 97.498° V = 1,032.00 Den(Calc)= 3.54
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: A2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.95(1), 3.84(0.8), 2.57(0.7),4.8(0.7), 2.78(0.6), 1.52(0.55), 1.62(0.55), 2.385(0.5),
 

Physical Properties of Julgoldite-(Fe+++)

Help on Cleavage: Cleavage: {100} Good
Help on Color: Color: Deep lustrous black, Greenish olive.
Help on Density: Density: 3.6
Help on Habit: Habit: Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
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= 0.132 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.117 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2284,KPDmeas= 0.2246,KC= 0.2588
Ncalc = 1.92 - 1.93
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)=3.49 gm/cc
note: Specific Gravity of Julgoldite-(Fe+++) =3.54 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEJulgoldite-(Fe+++) = 10.48 barns/electron
U=PEJulgoldite-(Fe+++) x rElectron Density= 36.58 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: 58.02.02.02 (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.(Dana8, AmMin v 88, p 1084) OPTIC PROP.(Dana8)
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

Search for Julgoldite-(Fe+++) using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Julgoldite-(Fe+++) :

Ask about Julgoldite-(Fe+++) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espańol

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

Julgoldite-(Fe+++)

Ca2Fe+++(Fe+++,Al)2(SiO4)(Si2O7)(O,OH)2•(H2O)
Dana No: 58.02.02.02 Strunz No: 09.BG.20
Locality:

 

Notes:

 

 
   
 


Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.