Mineralogy Database

Ekmanite Mineral Data

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General Ekmanite Information

Help on Chemical  Formula: Chemical Formula: (Fe++,Mg,Mn,Fe+++)3(Si,Al)4O10(OH)2•2(H2O)
Help on Composition: Composition: Molecular Weight = 440.08 gm
   Magnesium   2.21 %  Mg    3.66 % MgO
   Manganese   3.75 %  Mn    4.84 % MnO
   Aluminum    6.13 %  Al   11.58 % Al2O3
   Iron       16.50 %  Fe   16.33 % FeO /  5.44 % Fe2O3
   Silicon    19.15 %  Si   40.96 % SiO2
   Hydrogen    1.37 %  H    12.28 % H2O
   Oxygen     50.90 %  O
             ______        ______ 
             100.00 %       95.09 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+Mg0.4Mn2+0.3Fe3+0.3Si3AlO10(OH)2�2(H2O)
Help on Environment: Environment: Probably a Mn rich stilpnomelane.
Help on IMA Status: IMA Status: Discredited Am. Min. 1954 - Valid Species (Pre-IMA) 1892
Help on Locality: Locality: Brunsjogruvan, Gryhytte, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Unknown.

Ekmanite Crystallography

Help on Crystal System: Crystal System: Orthorhombic Space Group: Unk

Physical Properties of Ekmanite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Green, Gray white, Black.
Help on Diaphaneity: Diaphaneity: Translucent to Subopaque
Help on Luster: Luster: Sub Metallic

Optical Properties of Ekmanite

Help on Optical Data: Optical Data:

Calculated Properties of Ekmanite

Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEEkmanite = 6.77 barns/electron
U=PEEkmanite x rElectron Density= . barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ekmanite is Not Radioactive

Ekmanite Classification

Help on  Dana Class: Dana Class: (71)Phyllosilicate Minerals
  (71.00)Without Dana Classification Numbers
  (71.00.00)Phyllosilicate Bariumbannisterite* (K,H3O)(Ba,Ca)(Mn,Fe,Mg)21(Si,Al)32O80(O,OH)16•4-12(H2O) Mono Ekmanite? (Fe,Mg,Mn,Fe)3(Si,Al)4O10(OH)2•2(H2O) Unk Ortho Griffithite* 4(Mg,Fe,Ca)O.(Al,Fe)2O3.5SiO2•7(H2O) Mono Orlovite KLi2TiSi4O11F C 2 2 Shlykovite KCa[Si4O9(OH)]•3H2O P 21/c 2/m Spodiophyllite? (Na,K)4(Mg,Fe)3(Fe,Al)2(Si8O24) Mono Voloshinite Rb(LiAl1.5[]0.5)(Al0.5Si3.5)O10F2 C 2/c 2/m
Help on  Strunz Class: Strunz Class: 09.EG.40 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EG -Double nets with 6-membered and larger rings
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
09.EG.40 Ekmanite? (Fe,Mg,Mn,Fe)3(Si,Al)4O10(OH)2•2(H2O) Unk Ortho
09.EG.40 Lennilenapeite K6-7(Mg,Mn,Fe,Fe,Zn)48(Si,Al)72(O,OH)216•16(H2O) Unk (pseudo-HEX) Tri
09.EG.40 Parsettensite (K,Na,Ca)(Mn,Al)7Si8O20(OH)8•2(H2O)(?) C 2/m 2/m
09.EG.40 Stilpnomelane K(Fe,Mg,Fe)8(Si,Al)12(O,OH)27•n(H2O) P1 1

Other Ekmanite Information

Help on References: References: PHYS. PROP.(Larousse des Mineraux,1981)
Help on See Also: 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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Dana No: Strunz No: 09.EG.40





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