Julgoldite-(Fe+++) Mineral Data

Julgoldite-(Fe+++) Mineral Data +

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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.

Synonym:

Oxyjulgoldite

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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

Optical Data:

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

Calculated Properties of Julgoldite-(Fe+++)

Electron Density:

r_electron=3.49 gm/cc
note: r_{Julgoldite-(Fe+++)}=3.54 gm/cc.

Fermion Index

Fermion Index = 0.01352
Boson Index = 0.98648

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Julgoldite-(Fe+++) is Not Radioactive

Julgoldite-(Fe+++) Classification

Dana Class:

58.2.2.2 (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

Strunz Class:

VIII/C.24-61 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

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 -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)(O,OH)2·(H2O)
Dana No: 58.2.2.2 Strunz No: VIII/C.24-61
Locality:

Notes: