Kulkeite Mineral Data

General Kulkeite Information

Chemical Formula:

Na0.35Mg8AlSi7O20(OH)10

Composition:

Molecular Weight = 942.67 gm

Sodium 0.85 % Na 1.15 % Na₂O

Magnesium 20.63 % Mg 34.20 % MgO

Aluminum 6.87 % Al 12.98 % Al₂O₃

Silicon 19.66 % Si 42.07 % SiO₂

Hydrogen 1.07 % H 9.56 % H₂O

Oxygen 50.92 % O

______ ______

100.00 % 99.96 % = TOTAL OXIDE

Empirical Formula:

Na_0.35Mg₈Al_2.4Si_6.6O₂₀(OH)₁₀

Environment:

Meta-evaporite sequence.

IMA Status:

Approved IMA 1980

Locality:

El Mourdur Hill, near Derran, 35 km W of Ksar El Boukhari, Tell Atlas Mountians, Algeria. Link to MinDat.org Location Data.

Name Origin:

Named for Holger Kulke, geologist, Essen, Germany.

Name Pronunciation:

Kulkeite

Kulkeite Crystallography

Axial Ratios:

a:b:c =0.5784:1:2.5989

Cell Dimensions:

a = 5.319, b = 9.195, c = 23.897, Z = 2; beta = 97.1° V = 1,159.80 Den(Calc)= 2.70

Crystal System:

Monoclinic Space Group: Unk

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 7.9(1), 3.38(0.8), 11.9(0.8),

Physical Properties of Kulkeite

Cleavage:

{001} Perfect

Color:

Colorless.

Density:

2.7

Diaphaneity:

Transparent

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

2 - Gypsum

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Kulkeite

Gladstone-Dale:

CI meas= 0.05 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.05 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2066,KPDmeas= 0.2066,KC= 0.2175
Ncalc = 1.59

Optical Data:

Biaxial (-), a=1.552, b=1.5605, g=1.561, bire=0.0090, 2V(Calc)=26, 2V(Meas)=24. Dispersion r < v.

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Kulkeite

Electron Density:

Bulk Density (Electron Density)=2.71 gm/cc
note: Specific Gravity of Kulkeite =2.70 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Kulkeite= 1.45 barns/electron
U=PE_Kulkeite x rElectron Density= 3.93 barns/cc.

Radioactivity:

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

Kulkeite Classification

Dana Class:

71.04.02.06 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.04)interlayered 1:1, 2:1, and octahedra

(71.04.02)Interstratified Chlorite-Smectite group

71.04.02.01 Dozyite (Mg7Al2)(Si4Al2)O15(OH)12 Cm m

71.04.02.02 Lunijianlaite LiAl6(Si7Al)O20(OH)10 Unk Mono

71.04.02.03 Saliotite Na0.5Li0.5Al3AlSi3O10(OH)5 C 2/m 2/m

71.04.02.04 Tosudite Na0,5(Al,Mg)6(Si,Al)8O18(OH)12•5(H2O) Unk Ortho

71.04.02.05 Corrensite (Ca,Na,K)(Mg,Fe,Al)9(Si,Al)8O20(OH)10•n(H2O) Unk Ortho

71.04.02.06 Kulkeite Na0.35Mg8AlSi7O20(OH)10 Unk Mono

71.04.02.07 Rectorite (Na,Ca)Al4(Si,Al)8O20(OH)4•2(H2O) Unk Mono

71.04.02.08 Aliettite [Mg3Si4O10(OH)2](Ca0.5,Na)0.33(Al,Mg,Fe)2-3(Si,Al)4O10(OH)2•n(H2O) Unk Mono

71.04.02.09 Glagolevite! NaMg6[Si3AlO10](OH,O)8•H2O C1 1

Strunz Class:

09.EC.60 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets

09.EC.60 Aliettite [Mg3Si4O10(OH)2](Ca0.5,Na)0.33(Al,Mg,Fe)2-3(Si,Al)4O10(OH)2•n(H2O) Unk Mono

09.EC.60 Dozyite (Mg7Al2)(Si4Al2)O15(OH)12 Cm m

09.EC.60 Corrensite (Ca,Na,K)(Mg,Fe,Al)9(Si,Al)8O20(OH)10•n(H2O) Unk Ortho

09.EC.60 Kulkeite Na0.35Mg8AlSi7O20(OH)10 Unk Mono

09.EC.60 Karpinskite (Mg,Ni)2Si2O5(OH)2(?) Unk Mono

09.EC.60 Illite* (K,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,(H2O)] C 2/m 2/m

09.EC.60 Hydrobiotite [K(Mg,Fe)3(Al,Fe)Si3O10(OH,F)2]•[(Mg,Fe,Al)3(Si,Al)4O10(OH)2•4(H2O)] C 2/m 2/m

09.EC.60 Lunijianlaite LiAl6(Si7Al)O20(OH)10 Unk Mono

09.EC.60 Rectorite (Na,Ca)Al4(Si,Al)8O20(OH)4•2(H2O) Unk Mono

09.EC.60 Saliotite Na0.5Li0.5Al3AlSi3O10(OH)5 C 2/m 2/m

09.EC.60 Tosudite Na0,5(Al,Mg)6(Si,Al)8O18(OH)12•5(H2O) Unk Ortho

09.EC.60 Brinrobertsite! (Na,K,Ca)x(Al,Fe,Mg)4(Si,Al)8O20(OH)4•3.54(H2O)[x=0.35,n=3.54] pseudo 2/m 2/m

Other Kulkeite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic2)

See Also:

Links to other databases for Kulkeite :
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 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Kulkeite

Na0.35Mg8AlSi7O20(OH)10
Dana No: 71.04.02.06 Strunz No: 09.EC.60
Locality:

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