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.

Name Pronunciation:

Julgoldite-(Fe++) + Pronunciation

Julgoldite-(Fe++) Image

Images:

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

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

Diaphaneity:

Translucent

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Sub Metallic

Optical Properties of Julgoldite-(Fe++)

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

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)=3.43 gm/cc
note: Specific Gravity of Julgoldite-(Fe++) =3.47 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

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

Radioactivity:

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

Julgoldite-(Fe++) Classification

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

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.(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 - 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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