Kulkeite Mineral Data

Kulkeite Mineral Data +

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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.

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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:

MonoclinicSpace 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

Diaphaniety:

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

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:

r_electron=2.71 gm/cc
note: r_Kulkeite=2.70 gm/cc.

Fermion Index

Fermion Index = 0.03005
Boson Index = 0.96995

Photoelectric:

PE_Kulkeite= 1.45 barns/electron
U=PE_Kulkeite x r_electron= 3.93 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kulkeite is Not Radioactive

Kulkeite Classification

Dana Class:

71.4.2.6 (71)Phyllosilicate Sheets of Six-Membered Rings

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

(71.4.2)Interstratified Chlorite-Smectite group

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

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

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

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

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

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

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

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

71.4.2.9 Glagolevite! NaMg6[Si3AlO10](OH,O)8·H2O C1 1

Strunz Class:

VIII/H.18-10 VIII - Silicates

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

VIII/H.18 - Smectite/Montmorillonite group

VIII/H.18-05 Lunijianlaite LiAl6(Si7Al)O20(OH)10 Unk Mono

VIII/H.18-07 Saliotite Na0.5Li0.5Al3AlSi3O10(OH)5 C 2/m 2/m

VIII/H.18-10 Kulkeite Na0.35Mg8AlSi7O20(OH)10 Unk Mono

VIII/H.18-20 Aliettite [Mg3Si4O10(OH)2](Ca0.5,Na)0.33(Al,Mg,Fe)2-3(Si,Al)4O10(OH)2·n(H2O) Unk Mono

VIII/H.18-30 Rectorite (Na,Ca)Al4(Si,Al)8O20(OH)4·2(H2O) Unk Mono

VIII/H.18-50 Tosudite Na0,5(Al,Mg)6(Si,Al)8O18(OH)12·5(H2O) Unk Ortho

VIII/H.18-60 Corrensite (Ca,Na,K)(Mg,Fe,Al)9(Si,Al)8O20(OH)10·n(H2O) Unk Ortho

VIII/H.18-70 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

Other Kulkeite Information

References:

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

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Kulkeite

Na0.35Mg8AlSi7O20(OH)10
Dana No: 71.4.2.6 Strunz No: VIII/H.18-10
Locality:

Notes: