Julgoldite-(Fe++) Mineral Data

Julgoldite-(Fe++) Mineral Data +

General Julgoldite-(Fe++) Information

Chemical Formula:

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

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

Empirical Formula:

Ca₂Fe²⁺Fe³⁺_1.5Al_0.5(SiO₄)(Si₂O₇)(OH)₂·(H₂O)

IMA Status:

Approved IMA 1971

Locality:

Link to MinDat.org Location Data.

Name Origin:

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

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Julgoldite-(Fe++) Crystallography

Axial Ratios:

a:b:c =3.1956:1:1.4671

Cell Dimensions:

a = 19.433, b = 6.081, c = 8.922, Z = 4; beta = 97.6° V = 1,045.07 Den(Calc)= 3.47

Crystal System:

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

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

By Intensity(I/I_o): 2.949(1), 3.831(0.9), 2.572(0.76),

Physical Properties of Julgoldite-(Fe++)

Color:

Black, Greenish black, Green.

Density:

3.602

Diaphaniety:

Translucent

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Sub Metallic

Optical Properties of Julgoldite-(Fe++)

Optical Data:

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

Calculated Properties of Julgoldite-(Fe++)

Electron Density:

r_electron=3.43 gm/cc
note: r_{Julgoldite-(Fe++)}=3.47 gm/cc.

Fermion Index

Fermion Index = 0.01303
Boson Index = 0.98697

Photoelectric:

PE_{Julgoldite-(Fe++)}= 10.04 barns/electron
U=PE_{Julgoldite-(Fe++)} x r_electron= 34.44 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Julgoldite-(Fe++) is Not Radioactive

Julgoldite-(Fe++) Classification

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

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

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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: