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Pumpellyite-(Fe++) Mineral Data |
General Pumpellyite-(Fe++) Information |
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Ca2Fe++(Al,Fe+++)2(SiO4)(Si2O7)(OH)2•(H2O) | ||
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Molecular Weight = 485.24 gm | ||
Calcium 16.52 % Ca 23.11 % CaO | |||
Aluminum 11.12 % Al 21.01 % Al2O3 | |||
Iron 11.51 % Fe 14.81 % FeO | |||
Silicon 17.36 % Si 37.15 % SiO2 | |||
Hydrogen 0.62 % H 5.57 % H2O | |||
Oxygen 42.86 % O | |||
______ ______ | |||
100.00 % 101.65 % = TOTAL OXIDE | |||
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Ca2Fe2+Al2(SiO4)(Si2O7)(OH)•(H2O) | ||
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Approved IMA 1971 | ||
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Langban, near Filipstad, Varmland, Sweden (actually TL of julgoldite). Link to MinDat.org Location Data. | ||
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Named after the American geologist, R. Pumpelly (1837-1923). | ||
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Pumpellyite-(Fe++) + Pronunciation ![]() |
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Ferropumpellyite | ||
Pumpellyite-(Fe++) Image | |||
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Pumpellyite-(Fe++) Crystallography |
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a:b:c =1.4152:1:3.2338 | ||
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a = 8.49, b = 5.999, c = 19.4, Z = 4; beta = 100.4° V = 971.84 Den(Calc)= 3.32 | ||
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Monoclinic - Prismatic H-M Symbol (2/m) Space Group: A2/m | ||
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By Intensity(I/Io): 2.91(1), 2.75(0.6), 3.79(0.6),2.22(0.4), 2.47(0.3), 2.66(0.3), 4.43(0.3), 4.76(0.3), | ||
Physical Properties of Pumpellyite-(Fe++) |
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{001} Good, {100} Good | ||
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Blue green, Olive green, Brown. | ||
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3.2 | ||
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Translucent | ||
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Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces. | ||
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Fibrous - Crystals made up of fibers. | ||
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Massive - Lamellar - Distinctly foliated fine-grained forms. | ||
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Spherical - Spherical, rounded aggregates. | ||
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5.5 - Knife Blade | ||
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Vitreous (Glassy) | ||
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white | ||
Optical Properties of Pumpellyite-(Fe++) |
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CI meas= 0.006 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.042 (Good) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2069,KPDmeas= 0.2147,KC= 0.2161 Ncalc = 1.69 - 1.72 |
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Biaxial (+), a=1.682, b=1.685, g=1.694, bire=0.0120 | ||
Calculated Properties of Pumpellyite-(Fe++) |
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Bulk Density (Electron Density)=3.18 gm/cc note: Specific Gravity of Pumpellyite-(Fe++) =3.20 gm/cc. |
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Fermion Index = 0.01 Boson Index = 0.99 |
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PEPumpellyite-(Fe++) = 6.40 barns/electron U=PEPumpellyite-(Fe++) x rElectron Density= 20.35 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Pumpellyite-(Fe++) is Not Radioactive |
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Pumpellyite-(Fe++) Classification |
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58.02.02.05 (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 | |||
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09.BG.20 09 - SILICATES (Germanates) | ||
09.B - Sorosilicates | |||
09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups; | |||
Other Pumpellyite-(Fe++) Information |
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NAME( Duda&Rejl90) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8) | ||
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Links to other databases for Pumpellyite-(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 Search for Pumpellyite-(Fe++) using: Visit our Advertisers for Pumpellyite-(Fe++) : Ask about Pumpellyite-(Fe++) here : Print or Cut-and-Paste your Pumpellyite-(Fe++) Specimen Label here :
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