Ekmanite Mineral Data

General Ekmanite Information

Chemical Formula:

(Fe++,Mg,Mn,Fe+++)3(Si,Al)4O10(OH)2•2(H2O)

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

Empirical Formula:

Fe²⁺Mg_0.4Mn²⁺_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.

Search for Ekmanite Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

Ekmanite Crystallography

Crystal System:

OrthorhombicSpace Group: Unk

Physical Properties of Ekmanite

Cleavage:

{???} Good

Color:

Green, Gray white, Black.

Diaphaneity:

Translucent to Subopaque

Luster:

Sub Metallic

Optical Properties of Ekmanite

Optical Data:

Calculated Properties of Ekmanite

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Ekmanite= 6.77 barns/electron
U=PE_Ekmanite x rElectron Density= . barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ekmanite is Not Radioactive

Ekmanite Classification

Dana Class:

71.00.00.00 (71)Phyllosilicate Minerals

(71.00)Without Dana Classification Numbers

(71.00.00)Phyllosilicate

71.00.00.00 Bariumbannisterite* (K,H3O)(Ba,Ca)(Mn,Fe,Mg)21(Si,Al)32O80(O,OH)16•4-12(H2O) Mono

71.00.00.00 Ekmanite? (Fe,Mg,Mn,Fe)3(Si,Al)4O10(OH)2•2(H2O) Unk Ortho

71.00.00.00 Griffithite* 4(Mg,Fe,Ca)O.(Al,Fe)2O3.5SiO2•7(H2O) Mono

71.00.00.00 Orlovite KLi2TiSi4O11F C 2 2

71.00.00.00 Shlykovite KCa[Si4O9(OH)]•3H2O P 2₁/c 2/m

71.00.00.00 Spodiophyllite? (Na,K)4(Mg,Fe)3(Fe,Al)2(Si8O24) Mono

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)

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

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

Search for Ekmanite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Ekmanite :

A Bijoux Google Search for Ekmanite
Adam's Minerals Google Search for Ekmanite
Cape Minerals Google Search for Ekmanite
Dakota Matrix Minerals Google Search for Ekmanite
Excalibur Mineral Corp. Google Search for Ekmanite
Exceptional Minerals Google Search for Ekmanite
John Betts Fine Minerals Search for Ekmanite
McDougall Minerals Google Search for Ekmanite
Mineral News Website Link
Rock and Mineral Shows Google Search for Ekmanite
Weinrich Minerals, Inc. Google Search for Ekmanite

Ask about Ekmanite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Ekmanite Specimen Label here :

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: