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Psilomelane Mineral Data + |
General Psilomelane Information |
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| (Ba,H2O)2Mn5O10 | |||
| Molecular Weight = 590.03 gm | |||
| Barium 23.27 % Ba 25.99 % BaO | |||
| Manganese 46.56 % Mn 66.89 % Mn2O3 | |||
| Hydrogen 0.34 % H 3.05 % H2O | |||
| Oxygen 29.83 % O | |||
| ______ ______ | |||
| 100.00 % 95.93 % = TOTAL OXIDE | |||
| Ba·(H2O)Mn3+5O10 | |||
| General term for hard, black Mn oxides. Romanechite is one of the most common species. | |||
| Discredited IMA 1982 | |||
| Common world wide. Link to MinDat.org Location Data. | |||
| Named in 1758 from the Greek psilos - "smooth" and melas - "black." | |||
Psilomelane Image | |||
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Psilomelane Crystallography |
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| a:b:c =3.3194:1:4.809 | |||
| a = 9.56, b = 2.88, c = 13.85, Z = 2; beta = 92.5° V = 380.97 Den(Calc)= 5.14 | |||
| Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/m | |||
Physical Properties of Psilomelane |
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| None | |||
| Iron black, Dark steel gray. | |||
| 4.4 - 4.7, Average = 4.55 | |||
| Opaque | |||
| Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. | |||
| Botryoidal - "Grape-like" rounded forms (e.g.. malachite). | |||
| Mammillary - Larger "breast-like" rounded forms resembling botryoidal (e.g. malachite). | |||
| Reniform - "Kidney like" in shape (e.g.. hematite). | |||
| 5-6 - Between Apatite and Orthoclase | |||
| None. | |||
| Sub Metallic | |||
| Nonmagnetic | |||
| brownish black | |||
Optical Properties of Psilomelane |
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| NCalc= 2.26 - from Gladstone-Dale relationship (KC = 0.245) where Ncalc=Dcalc*KC+1 NCalc= 2.11 - from Gladstone-Dale relationship (KC = 0.245) where Ncalc=Dmeas*KC+1 |
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Calculated Properties of Psilomelane |
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relectron=4.72 gm/cc |
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| Fermion Index = 0.04162 Boson Index = 0.95838 |
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PEPsilomelane = 114.11 barns/electron |
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| GRapi = 0 (Gamma Ray American Petroleum Institute Units) Psilomelane is Not Radioactive |
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Psilomelane Classification |
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| 7.9.2.0 (7)Multiple Oxides | |||
| (7.9)where A B (O)2 | |||
| (7.9.2)Dana Group | |||
| IV/X.00-00 IV - Oxides | |||
| IV/X - Unclassified Strunz Oxides | |||
| IV/X.00 - Oxide | |||
Other Psilomelane Information |
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| NAME( Duda&Rejl90) PHYS. PROP.(Mason68) | |||
| Links to other databases for Psilomelane : 1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 -Athena 4 - Crocoite.com Mineral Locations 5 - Franklin Minerals(Palache) 6 - Glendale Community College 7 -Google Images 8 -Google Scholar 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 - Minerals of Wisconsin 14 -QUT Mineral Atlas 15 - WWW-MINCRYST Search for Psilomelane using: Visit our Advertisers for Psilomelane : AA Mineral SpecimensB & L Fine Minerals Dan Weinrich Fine Minerals Dan Weinrich Auctions e-Rocks Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals T G Fine Minerals Wrights Rock Shop Translate Psilomelane Mineral Data : Ask about Psilomelane here : Print or Cut-and-Paste your Psilomelane Specimen Label here :
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