Julgoldite-(Fe+++) Mineral Data

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.

Synonym:

Oxyjulgoldite

Search for Julgoldite-(Fe ) Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

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

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

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Julgoldite-(Fe+++) :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Julgoldite-(Fe+++) Mineral Data :

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 Español

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: