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Ekmanite Mineral Data
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General Ekmanite Information
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 Chemical Formula: |
(Fe++,Mg,Mn,Fe+++)3(Si,Al)4O10(OH)2•2(H2O) |
| Composition: |
Molecular Weight = 440.08 gm |
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Magnesium 2.21 % Mg 3.66 % MgO |
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Manganese 3.75 % Mn 4.84 % MnO |
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Aluminum 6.13 % Al 11.58 % Al2O3 |
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Iron 16.50 % Fe 16.33 % FeO / 5.44 % Fe2O3 |
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Silicon 19.15 % Si 40.96 % SiO2 |
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Hydrogen 1.37 % H 12.28 % H2O |
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Oxygen 50.90 % O |
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______ ______ |
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100.00 % 95.09 % = TOTAL OXIDE |
| Empirical Formula: |
Fe2+Mg0.4Mn2+0.3Fe3+0.3Si3AlO10(OH)2�2(H2O) |
| Environment: |
Probably a Mn rich stilpnomelane. |
| IMA Status: |
Discredited Am. Min. 1954 - Valid Species (Pre-IMA) 1892 |
| Locality: |
Brunsjogruvan, Gryhytte, Sweden. Link to MinDat.org Location Data. |
| Name Origin: |
Unknown. |
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Ekmanite Crystallography
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| Crystal System: |
Orthorhombic Space Group: Unk |
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Physical Properties of Ekmanite
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| Cleavage: |
{???} Good |
| Color: |
Green, Gray white, Black. |
| Diaphaneity: |
Translucent to Subopaque |
| Luster: |
Sub Metallic |
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Optical Properties of Ekmanite
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| Optical Data: |
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Calculated Properties of Ekmanite
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PEEkmanite = 6.77 barns/electron
U=PEEkmanite x rElectron Density= . barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ekmanite is Not Radioactive |
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Ekmanite Classification
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| Dana Class: |
71.00.00.00 (71)Phyllosilicate Minerals |
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(71.00)Without Dana Classification Numbers |
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(71.00.00)Phyllosilicate |
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71.00.00.00 Bariumbannisterite* (K,H3O)(Ba,Ca)(Mn,Fe,Mg)21(Si,Al)32O80(O,OH)16•4-12(H2O) Mono |
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71.00.00.00 Ekmanite? (Fe,Mg,Mn,Fe)3(Si,Al)4O10(OH)2•2(H2O) Unk Ortho |
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71.00.00.00 Griffithite* 4(Mg,Fe,Ca)O.(Al,Fe)2O3.5SiO2•7(H2O) Mono |
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71.00.00.00 Orlovite KLi2TiSi4O11F C 2 2 |
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71.00.00.00 Shlykovite KCa[Si4O9(OH)]•3H2O P 21/c 2/m |
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71.00.00.00 Spodiophyllite? (Na,K)4(Mg,Fe)3(Fe,Al)2(Si8O24) Mono |
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71.00.00.00 Voloshinite Rb(LiAl1.5[]0.5)(Al0.5Si3.5)O10F2 C 2/c 2/m |
| Strunz Class: |
09.EG.40 09 - SILICATES (Germanates) |
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09.E - Phyllosilicates |
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09.EG -Double nets with 6-membered and larger rings |
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09.EG.40 Franklinphilite (K,Na)4(Mn,Mg,Zn)48(Si,Al)72(O,OH)216•6(H2O) pseudo-HEX P1 or P1 Tri |
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09.EG.40 Ekmanite? (Fe,Mg,Mn,Fe)3(Si,Al)4O10(OH)2•2(H2O) Unk Ortho |
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09.EG.40 Lennilenapeite K6-7(Mg,Mn,Fe,Fe,Zn)48(Si,Al)72(O,OH)216•16(H2O) Unk (pseudo-HEX) Tri |
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09.EG.40 Parsettensite (K,Na,Ca)(Mn,Al)7Si8O20(OH)8•2(H2O)(?) C 2/m 2/m |
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09.EG.40 Stilpnomelane K(Fe,Mg,Fe)8(Si,Al)12(O,OH)27•n(H2O) P1 1 |
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Other Ekmanite Information
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| References: |
PHYS. PROP.(Larousse des Mineraux,1981) |
| See Also: |
Links to other databases for Ekmanite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
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Print or Cut-and-Paste your Ekmanite Specimen Label here :
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Ekmanite
(Fe++,Mg,Mn,Fe+++)3(Si,Al)4O10(OH)2•2(H2O)
Dana No: 71.00.00.00 Strunz No: 09.EG.40
Locality:
Notes:
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