Ekmanite Mineral Data

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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.

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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 - Google Images
6 - Google Scholar
7 - MinDAT
8 - MinMax(Deutsch)
9 - MinMax(English)
10 - Mineralienatlas (Deutsch)
11 - QUT Mineral Atlas
12 - Ruff.Info

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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: