Lemanskiite Mineral Data

General Lemanskiite Information

Chemical Formula:

NaCaCu5(AsO4)4Cl•5H2O

Composition:

Molecular Weight = 1,060.88 gm

Sodium 2.25 % Na 3.04 % Na₂O

Calcium 3.78 % Ca 5.29 % CaO

Copper 30.01 % Cu 37.57 % CuO

Arsenic 28.25 % As 43.33 % As₂O₅

Hydrogen 0.94 % H 8.37 % H₂O

Chlorine 3.21 % Cl 3.21 % Cl

- % Cl -0.72 % -O=Cl₂

Oxygen 31.57 % O

______ ______

100.00 % 100.08 % = TOTAL OXIDE

Empirical Formula:

Na_1.04CaCu_5.01(AsO₄)₄Cl_0.96•4.93(H₂O)

Environment:

Found in mine dump material from the abandoned Abundancia gold mine, Ca-analog of zdenekite, dimorphous with lavendulan.

IMA Status:

Approved IMA 2001 (Dana # Added)

Locality:

El Guanaco mining district, south of Cerro La Estrella, about 95 km east of Taltal, in Region II, Antofagasta Province, Chile. Link to MinDat.org Location Data.

Name Origin:

Named for Chester (Chet) S. Lemanski, Jr (b. 1947),.

Synonym:

IMA1999-037

Lemanskiite Image

Images:

Lemanskiite

Comments: Electric blue lemanskiite sprays on matrix.
Location: Abundancia Mine, Guanaco, Chile. Scale: Picture size 1.2 cm.
© John Veevaert

Lemanskiite Crystallography

Axial Ratios:

a:c = 1:3.6803

Cell Dimensions:

a = 9.9758, c = 36.714, Z = 8; V = 3,653.65 Den(Calc)= 3.86

Crystal System:

Tetragonal - Trapezohedral H-M Symbol (4 2 2) Space Group: P 4₁22 or P 4₃22

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

By Intensity(I/I_o): 9.177(1)(004 ), 4.588(0.32)(008 ), 3.059(0.15)(0.0.12),4.167(0.1)(108 ), 9.6(0.09)(101 ), 2.606(0.06)(2.0.12), 2.924(0.05)(1.0.12), 1.1471(0.04)(0.0.32), 1.3102(0.04)(2.2.26),

Physical Properties of Lemanskiite

Cleavage:

{hk0} Perfect

Color:

Dark blue.

Density:

3.78

Diaphaneity:

Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Rosette - Bundled tabular aggregates resembling rose flower petals.

Hardness:

2.5 - Finger Nail

Luster:

Vitreous (Glassy)

Streak:

light blue

Optical Properties of Lemanskiite

Gladstone-Dale:

CI meas= 0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.046 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1808,KPDmeas= 0.1847,KC= 0.1895
Ncalc = 1.72 - 1.73

Optical Data:

Uniaxial (-), e=1.647, w=1.749, bire=0.1020.

Calculated Properties of Lemanskiite

Electron Density:

Bulk Density (Electron Density)=3.58 gm/cc
note: Specific Gravity of Lemanskiite =3.78 gm/cc.

Fermion Index:

Fermion Index = 0.000203918
Boson Index = 0.999796082

Photoelectric:

PE_Lemanskiite= 33.42 barns/electron
U=PE_Lemanskiite x rElectron Density= 119.62 barns/cc.

Radioactivity:

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

Lemanskiite Classification

Dana Class:

42.09.04.05 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.09)where (A)3 (XO4)2 Zq ï¿½ x(H2O)

(42.09.04)Dana Group

42.09.04.01 Sampleite NaCaCu5(PO4)4Cl•5(H2O) pseudo TET 2/m 2/m 2/m

42.09.04.02 Lavendulan NaCaCu5(AsO4)4Cl•5(H2O) Unk Ortho

42.09.04.03 Zdenekite NaPbCu5(AsO4)4Cl•5(H2O) P 4₁22,P 4₃22 4 2 2

42.09.04.04 Mahnertite! (Na,Ca)Cu3(AsO4)2Cl•5(H2O) I 4mmm 4 2 2

42.09.04.05 Lemanskiite! NaCaCu5(AsO4)4Cl•5H2O P 4₁22 or P 4₃22 4 2 2

Strunz Class:

08.DG.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DG -With large and medium-sized cations, (OH, etc.):RO4 < 0.5:1

08.DG.05 Lavendulan NaCaCu5(AsO4)4Cl•5(H2O) Unk Ortho

08.DG.05 Shubnikovite Ca2Cu8(AsO4)6Cl(OH)•7(H2O)(?) Unk Ortho

08.DG.05 Sampleite NaCaCu5(PO4)4Cl•5(H2O) pseudo TET 2/m 2/m 2/m

08.DG.05 Zinclavendulan? NaCa(Zn,Cu)5(AsO4)4Cl•4-5(H2O) Unk Ortho

08.DG.05 Lemanskiite! NaCaCu5(AsO4)4Cl•5H2O P 4₁22 or P 4₃22 4 2 2

08.DG.05 Zdenekite NaPbCu5(AsO4)4Cl•5(H2O) P 4₁22,P 4₃22 4 2 2

Other Lemanskiite Information

References:

NAME( AmMin, v91, p1947) PHYS. PROP.(AmMin, v91, p1947) OPTIC PROP.(AmMin, v91, p1947)

See Also:

Links to other databases for Lemanskiite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Lemanskiite

NaCaCu5(AsO4)4Cl•5H2O
Dana No: 42.09.04.05 Strunz No: 08.DG.05
Locality:

Notes:

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