Julgoldite-(Fe+++) Mineral Data

General Julgoldite-(Fe+++) Information

Chemical Formula:

Ca2Fe+++(Fe+++,Al)2(SiO4)(Si2O7)(O,OH)2•(H2O)

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

Empirical Formula:

Ca₈Fe³⁺_2.7Al_1.1Mg_0.2Fe³⁺₈Si₁₂O₄₂(OH)₁₄

Environment:

Fracture filling in hematite-magnetite ore from the Amerika stope at Langban.

IMA Status:

Approved IMA 1971

Locality:

Langban, Varmland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named in 1971 by Moore for Julian Royce Goldsmith (1918-), American geochemist, University of Chicago.

Name Pronunciation:

Julgoldite-(Fe+++) + Pronunciation

Synonym:

Oxyjulgoldite

Julgoldite-(Fe+++) Image

Images:

Julgoldite-(Fe+++)

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

Julgoldite-(Fe+++) Crystallography

Axial Ratios:

a:b:c =1.4671:1:3.1911

Cell Dimensions:

a = 8.8879, b = 6.058, c = 19.3321, Z = 1; beta = 97.498° V = 1,032.00 Den(Calc)= 3.54

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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+++)

Cleavage:

{100} Good

Color:

Deep lustrous black, Greenish olive.

Density:

3.6

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Sub Metallic

Optical Properties of Julgoldite-(Fe+++)

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

Optical Data:

Biaxial (-), a=1.776, b=1.814, g=1.836, bire=0.0600

Calculated Properties of Julgoldite-(Fe+++)

Electron Density:

Bulk Density (Electron Density)=3.49 gm/cc
note: Specific Gravity of Julgoldite-(Fe+++) =3.54 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Julgoldite-(Fe+++)}= 10.48 barns/electron
U=PE_{Julgoldite-(Fe+++)} x rElectron Density= 36.58 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Julgoldite-(Fe+++) is Not Radioactive

Julgoldite-(Fe+++) Classification

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

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

References:

NAME( Dana8) PHYS. PROP.(Dana8, AmMin v 88, p 1084) OPTIC PROP.(Dana8)

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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