[Mineral Galleries] [About Me] [e-Bay Items] [Latest News] [How to Order] A Diverse Selection of Beautifully Unique Gem & Mineral Specimens Desert Winds Gems & Minerals • For All Levels of Collectors Worldwide Aesthetic & Rare Mineral Specimens • Regular Updates General Julgoldite-(Fe++) InformationCa2Fe++(Fe+++,Al)2(SiO4)(Si2O7)(OH)2•(H2O) |
Molecular Weight = 545.54 gm |
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Calcium 14.69 % Ca 20.56 % CaO |
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Aluminum 2.47 % Al 4.67 % Al2O3 |
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Iron 25.59 % Fe 13.17 % FeO / 21.95 % Fe2O3 |
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Silicon 15.44 % Si 33.04 % SiO2 |
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Hydrogen 0.74 % H 6.60 % H2O |
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Oxygen 41.06 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Ca2Fe2+Fe3+1.5Al0.5(SiO4)(Si2O7)(OH)2·(H2O) |
Approved IMA 1971 |
Link to MinDat.org Location Data. |
Named in 1971 by Moore for Julian Royce Goldsmith (1918-), American geochemist, University of Chicago. |
Julgoldite-(Fe++) + Pronunciation |
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Julgoldite-(Fe++) Crystallographya:b:c =3.1956:1:1.4671 |
a = 19.433, b = 6.081, c = 8.922, Z = 4; beta = 97.6° V = 1,045.07 Den(Calc)= 3.47 |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m |
By Intensity(I/Io): 2.949(1), 3.831(0.9), 2.572(0.76), |
| Physical Properties of Julgoldite-(Fe++)Black, Greenish black, Green. |
3.602 |
Translucent |
4.5 - Between Fluorite and Apatite |
Sub Metallic |
| Optical Properties of Julgoldite-(Fe++)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 Biaxial (-), a=1.776, b=1.814, g=1.836, bire=0.0600 |
| Calculated Properties of Julgoldite-(Fe++)Bulk Density (Electron Density)=3.43 gm/cc |
note: Specific Gravity of Julgoldite-(Fe++) =3.47 gm/cc. Fermion Index = 0.01 |
Boson Index = 0.99 PEJulgoldite-(Fe++) = 10.04 barns/electron |
U=PEJulgoldite-(Fe++) x rElectron Density= 34.44 barns/cc. GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Julgoldite-(Fe++) is Not Radioactive | Julgoldite-(Fe++) Classification58.02.02.01 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups |
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(58.02)with cations in [6] and higher coordination; single and double groups (n=1,2) |
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(58.02.02)Pumpellyite group |
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09.BG.20 09 - SILICATES (Germanates) |
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09.B - Sorosilicates |
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09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups; |
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| Other Julgoldite-(Fe++) InformationNAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
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 10 - Ruff.Info Search for Julgoldite-(Fe++) using: Visit our Advertisers for Julgoldite-(Fe++) : AA Mineral SpecimensB & L Fine Minerals Crystalarium.com Dan Weinrich Fine Minerals Dan Weinrich Auctions Dakota Matrix Desert Winds Gems and Minerals Excalibur Minerals Exceptional Minerals Fabre Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club Wrights Rock Shop Translate Julgoldite-(Fe++) Mineral Data : Ask about Julgoldite-(Fe++) here : Print or Cut-and-Paste your Julgoldite-(Fe++) Specimen Label here :
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