Lesukite Mineral Data

Lesukite Mineral Data +

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General Lesukite Information

Chemical Formula:

Al2(OH)5Cl·2(H2O)

Composition:

Molecular Weight = 210.48 gm

Aluminum 25.64 % Al 48.44 % Al₂O₃

Hydrogen 4.31 % H 38.52 % H₂O

Chlorine 16.84 % Cl 16.84 % Cl

- % Cl -3.80 % -O=Cl₂

Oxygen 53.21 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Al₂(OH)₅Cl·2(H₂O)

Environment:

The result of interaction of fumarole gases and volcanic rocks at 50 deg C.

IMA Status:

Approved IMA 1997 (Dana # Added)

Locality:

The Tolbachik Main Fracture eruption, Kamchatka, Russia. Link to MinDat.org Location Data.

Name Origin:

Named after Grigorii Ivanovich Lesuke (1935–1995), technical worker in the Department of Crystallography, University of St. Petersburg, Russia.

Synonym:

IMA1996-004

Lesukite Image

Images:

Lesukite

Comments: Yellow to orange-yellow lesukite.
Location: Deutschlandschacht Mine, Oelsnitz, Zwickau, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Lesukite Crystallography

Cell Dimensions:

a = 19.878, Z = 36; V = 7,854.49 Den(Calc)= 1.60

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: I m3m

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

By Intensity(I/I_o): 2.706(1), 2.446(0.8), 8.11(0.7),

Physical Properties of Lesukite

Color:

Yellowish orange, Yellowish brown.

Density:

1.87

Diaphaniety:

Transparent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Tabular - Form dimensions are thin in one direction.

Luster:

Vitreous (Glassy)

Streak:

yellowish orange

Optical Properties of Lesukite

Gladstone-Dale:

CI meas= -0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.186 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3375,KPDmeas= 0.2888,KC= 0.2845

Optical Data:

Isotropic, n=1.53-1.55.

Calculated Properties of Lesukite

Electron Density:

r_electron=1.92 gm/cc
note: r_Lesukite=1.87 gm/cc.

Fermion Index

Fermion Index = 0.00026
Boson Index = 0.99974

Photoelectric:

PE_Lesukite= 1.91 barns/electron
U=PE_Lesukite x r_electron= 3.66 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Lesukite is Not Radioactive

Lesukite Classification

Dana Class:

10.5.1.2 (10)Oxyhalides and Hydroxyhalides

(10.5)where Am (O,OH)p Xq

(10.5.1)Dana Group

10.5.1.1 Cadwaladerite Al(OH)2Cl·4(H2O) None

10.5.1.2 Lesukite ! Al2(OH)5Cl·2(H2O) I m3m 4/m 3 2/m

Strunz Class:

III/A.13-05 III - Halogenides

III/A - Simple Halogenides, with water Metal : Halogen = 1 : 1 to 1 : 3

III/A.13 - Cadwaladerite - Hydromolysite series

III/A.13-05 Lesukite Al2(OH)5Cl·2(H2O) I m3m 4/m 3 2/m

III/A.13-10 Cadwaladerite Al(OH)2Cl·4(H2O) None

III/A.13-20 Chloraluminite AlCl3·6(H2O) R 3c 3 2/m

III/A.13-30 Hydromolysite? FeCl3·6(H2O) C 2/m 2/m

Other Lesukite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.83,p654,1998) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Lesukite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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

Lesukite

Al2(OH)5Cl·2(H2O)
Dana No: 10.5.1.2 Strunz No: III/A.13-05
Locality:

Notes: