Ekmanite Mineral Data

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)

IMA Status:

Discredited IMA 1954

Locality:

Brunsjogruvan, Gryhytte, Sweden. Link to MinDat.org Location Data.

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Ekmanite Crystallography

Crystal System:

OrthorhombicSpace Group: Unk

Physical Properties of Ekmanite

Cleavage:

[???] Good

Color:

Green, Gray white, Black.

Diaphaniety:

Translucent to Subopaque

Luster:

Sub Metallic

Calculated Properties of Ekmanite

Fermion Index

Fermion Index = 0.01489
Boson Index = 0.98511

Photoelectric:

PE_Ekmanite= 6.77 barns/electron
U=PE_Ekmanite x r_electron= . barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ekmanite is Not Radioactive

Ekmanite Classification

Dana Class:

71.0.0.0 (71)Phyllosilicate Minerals

(71.0)Without Dana Classification Numbers

(Phyllosilicate)

Strunz Class:

VIII/H.17-80 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups

VIII/H.17 - Stilpnomelane series

VIII/H.17-10 Bannisterite KCa(Mn,Fe,Zn,Mg)21(Si,Al)32O76(OH)16·4-12(H2O) A2/a 2/m

VIII/H.17-20 Bariumbannisterite* (K,H3O)(Ba,Ca)(Mn,Fe,Mg)21(Si,Al)32O80(O,OH)16·4-12(H2O) Mono

VIII/H.17-30 Lennilenapeite K6-7(Mg,Mn,Fe,Fe,Zn)48(Si,Al)72(O,OH)216·16(H2O) Unk (pseudo-HEX) Tri

VIII/H.17-40 Stilpnomelane K(Fe,Mg,Fe)8(Si,Al)12(O,OH)27·n(H2O) P1 1

VIII/H.17-45 Franklinphilite (K,Na)4(Mn,Mg,Zn)48(Si,Al)72(O,OH)216·6(H2O) pseudo-HEX P1 or P1 Tri

VIII/H.17-50 Parsettensite (K,Na,Ca)(Mn,Al)7Si8O20(OH)8·2(H2O)(?) C 2/m 2/m

VIII/H.17-60 Ganophyllite (K,Na)2(Mn,Al,Mg)8(Si,Al)12O29(OH)7·8-9(H2O) A2/a 2/m

VIII/H.17-70 Eggletonite Na2Mn8[Si11AlO29](OH)7·11(H2O) Ia or I2/a Mono

VIII/H.17-75 Tamaite! (Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112·21(H2O) P 2₁/a 2/m

VIII/H.17-80 Ekmanite (Fe,Mg,Mn,Fe)3(Si,Al)4O10(OH)2·2(H2O) Unk Ortho

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 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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Ekmanite

(Fe++,Mg,Mn,Fe+++)3(Si,Al)4O10(OH)2·2(H2O)
Dana No: Unknown Strunz No: VIII/H.17-80
Locality:

Notes: