| Chapmanite Mineral Data |
General Chapmanite Information |
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| Sb+++Fe+++2(SiO4)2(OH) | |||
| Molecular Weight = 434.62 gm | |||
| Iron 25.70 % Fe 33.06 % FeO | |||
| Silicon 12.92 % Si 27.65 % SiO2 | |||
| Antimony 28.01 % Sb 31.69 % SbO | |||
| Hydrogen 0.23 % H 2.07 % H2O | |||
| Oxygen 33.13 % O | |||
| ______ ______ | |||
| 100.00 % 94.48 % = TOTAL OXIDE | |||
| Fe2+2Sb(SiO4)2(OH) | |||
| Intimately associated with silver ores. Antimomy analog to bismutoferrite. | |||
| Valid Species (Pre-IMA) 1924 | |||
| Keeley Mine is South Lorrain near Cobalt, Ontaario, Canada. Link to MinDat.org Location Data. | |||
| Named after the Canadian mineralogist, E. J. Chapman (1821-1904). | |||
| ICSD 87100 | |||
| PDF 11-135 | |||
Chapmanite Image | |||
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Chapmanite Crystallography |
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| a:b:c =0.5773:1:0.8565 | |||
| a = 5.19, b = 8.99, c = 7.7, Z = 2; beta = 100.67° V = 353.06 Den(Calc)= 4.09 | |||
| Monoclinic - DomaticH-M Symbol (m) Space Group: Cm | |||
| By Intensity(I/Io): 3.58(1), 7.63(0.9), 3.19(0.9),3.88(0.8), 2.59(0.7), 2.9(0.7), 2.54(0.3), 4.17(0.3), | |||
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Mouse |
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Physical Properties of Chapmanite |
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| Yellowish green, Yellow, Olive green. | |||
| 3.58 - 3.7, Average = 3.64 | |||
| Translucent | |||
| Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. | |||
| Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite). | |||
| Granular - Generally occurs as anhedral to subhedral crystals in matrix. | |||
| 2.5 - Finger Nail | |||
| None. | |||
| Adamantine | |||
| yellowish green | |||
Optical Properties of Chapmanite |
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| CI meas= -0.995 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.775 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2249,KPDmeas= 0.2527,KC= 0.1267 |
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| Biaxial (-), a=1.85, b=1.95, g=1.96, bire=0.1100, 2V(Calc)=32, 2V(Meas)=small. Dispersion none. | |||
| none. | |||
| none. | |||
| none. | |||
Calculated Properties of Chapmanite |
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relectron=3.84 gm/cc |
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| Fermion Index = 0.01164 Boson Index = 0.98836 |
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PEChapmanite = 96.25 barns/electron |
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| GRapi = 0 (Gamma Ray American Petroleum Institute Units) Chapmanite is Not Radioactive |
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Chapmanite Classification |
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| 71.1.3.2 (71)Phyllosilicate Sheets of Six-Membered Rings | |||
| (71.1)with 1:1 layers | |||
| (71.1.3)Bismutoferrite group | |||
| VIII/B.06-10 VIII - Silicates | |||
| VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cations of octahedral and tetrahedral orientation [4/6] | |||
| VIII/B.06 - Chapmanite - Bismutoferrite series | |||
Other Chapmanite Information |
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| NAME( Duda&Rejl90) PHYS. PROP.(Dana8) OPTIC PROP.(Ford32) | |||
| Links to other databases for Chapmanite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris Search for Chapmanite using: Visit our Advertisers for Chapmanite : Translate Chapmanite Mineral Data : Ask about Chapmanite here : Print or Cut-and-Paste your Chapmanite Specimen Label here :
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