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Lemanskiite

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El Guanaco Mine, Guanaco (Huanaco), Santa Catalina, Antofagasta Province, Antofagasta Region, Chile

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Formula:
NaCaCu
 
5
[Cl|(AsO
 
4
)
 
4
] · 5H
 
2
O
System:TetragonalColour:Sky Blue
Hardness:2 - 3
Name:Named for Chester (Chet) S. Lemanski, Jr., a New Jersey, USA, collector and former President of the Franklin-Ogdensburg Mineralogical Society, board member and former Vice President of the Franklin Mineral Museum, former hard rock miner (Sterling Mine, NJ) and professional investigator, now retired.
Dimorph of:Lavendulan


Lavendulan Group.

Masses and aggregated groups of crystals in and on matrix; massive, filling spaces between breccia fragments. Easy to confuse with lavendulan, of which it is a polymorph. May occur simultaneously with lavendulan.

Classification of Lemanskiite

IMA status:Approved 1999
Strunz 8th edition ID:7/D.25-24
Nickel-Strunz 10th (pending) edition ID:8.DG.05

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
G : With large and medium-sized cations, (OH, etc.):RO4< 0.5:1
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Type Occurrence of Lemanskiite

Type Locality:El Guanaco Mine, Guanaco (Huanaco), Santa Catalina, Antofagasta Province, Antofagasta Region, Chile
General Appearance of Type Material:Rosette-shaped aggregates of thin platey crystals.
Year of Discovery:1998
Geological Setting of type material:Occurs in the oxidized zone of an enargite-rich gold deposit in an arid environment.
Associated Minerals at type locality:
TalcSénarmontiteSénarmontiteRutileQuartz
OliveniteMansfielditeLammeriteAnatase

Physical Properties of Lemanskiite

Lustre:Vitreous
Diaphaneity (Transparency):Translucent
Colour:Sky Blue
Streak:Sky blue
Hardness (Mohs):2 - 3
Cleavage:Perfect
(001)
Parting:None.
Fracture:Irregular/Uneven
Density (measured):3.78 g/cm3
Density (calculated):3.86 g/cm3

Crystallography of Lemanskiite

Crystal System:Tetragonal
Cell Parameters:a = 9.9758Å, c = 36.714Å
Ratio:a:c = 1 : 3.68
Unit Cell Volume:V 3653.6 ų
Z:8
Morphology:Thin tetragonal plates. Crystals bent to the angstrom level.
Twinning:None mentioned.
X-Ray Powder Diffraction:
d-spacingIntensity
9.60 (9)
9.18 (100)
4.59 (32)
4.17 (10)
3.06 (15)
2.924 (5)
Comments:Possibly affected by preferred orientation.

Optical Data of Lemanskiite

Type:Uniaxial (-)
RI values: nω = 1.749 nε = 1.647
Maximum Birefringence:δ = 0.102

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Pleochroism:Strong
Comments:O dark green-blue, E light blue-green

Chemical Properties of Lemanskiite

Formula:
NaCaCu
 
5
[Cl|(AsO
 
4
)
 
4
] · 5H
 
2
O
Essential elements:As, Ca, Cl, Cu, H, Na, O
All elements listed in formula:As, Ca, Cl, Cu, H, Na, O
Empirical Formula:
Na1.04Ca1.00Cu5.01(AsO4)4.00[Cl0.96(OH)0.11]sum1.07.4.93H2O

Relationship of Lemanskiite to other Species

Member of Group:
Lavendulan Group:
Related Minerals - Nickel-Strunz Grouping):

- +
8.DG.05Lavendulan
NaCaCu
 
5
[Cl|(AsO
 
4
)
 
4
] · 5H
 
2
O
8.DG.05Sampleite
NaCaCu
 
5
[Cl|(PO
 
4
)
 
4
] · 5H
 
2
O
8.DG.05Shubnikovite
Ca
 
2
Cu
 
8
[Cl|OH|(AsO
 
4
)
 
6
] · 7H
 
2
O
8.DG.05Zdenĕkite
NaPbCu
 
5
[Cl|(AsO
 
4
)
 
4
] · 5H
 
2
O

Other Names for Lemanskiite

Synonyms:
ChetlemanskiiteIMA1999-037
Other Languages:
German:Lemanskiit
Japanese:レマンスキー石
Spanish:Lemanskiita

Other Information

Fluorescence in UV light:None
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Lemanskiite

Reference List:Ondruš, P., Veselovský, F, Sejkora, J., Skála, R., Pažout, R., Frýda, J., Gabašová, A., Vajdak, J. (2006): Lemanskiite, NaCaCu5(AsO4)4Cl•5H2O, a new mineral species from the Abundancia mine, Chile. Can. Mineral., 44, 523-531.

Giester, Gerald; Uwe Kolitsch; Peter Leverett; Peter Turner; and Peter A. Williams (2007) The crystal structures of lavendulan, sampleite, and a new polymorph of sampleite. European Journal of Mineralogy 19,75-93.

Internet Links for Lemanskiite

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    Localities for Lemanskiite

    Hide Locality List
    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Chile
     
    • Antofagasta Region
      • Antofagasta Province
        • Miraflores
          • San Juan
    		Ondruš, P., Veselovský, F, Sejkora, J., Skála, R., Pažout, R., Frýda, J., Gabašová, A., Vajdak, J. (2005): Lemanskiite, NaCaCu5(AsO4)4Cl•5H2O, a new mineral species from the Abundancia mine, Chile. Can. Mineral. 44, 523-531.
        • Santa Catalina
          • Guanaco (Huanaco)
    		Ondruš, P., Veselovský, F, Sejkora, J., Skála, R., Pažout, R., Frýda, J., Gabašová, A., Vajdak, J. (2005): Lemanskiite, NaCaCu5(AsO4)4Cl•5H2O, a new mineral species from the Abundancia mine, Chile. Can. Mineral. 44, 523-531.
    Ondruš, P., Veselovský, F, Sejkora, J., Skála, R., Pažout, R., Frýda, J., Gabašová, A., Vajdak, J. (2005): Lemanskiite, NaCaCu5(AsO4)4Cl•5H2O, a new mineral species from the Abundancia mine, Chile. Can. Mineral. 44, 523-531.
    Greece
     
    • Attikí (Attica; Attika) Prefecture
      • Lavrion (Laurion; Laurium) District
    		Ondruš, P., Veselovský, F, Sejkora, J., Skála, R., Pažout, R., Frýda, J., Gabašová, A., Vajdak, J. (2005): Lemanskiite, NaCaCu5(AsO4)4Cl•5H2O, a new mineral species from the Abundancia mine, Chile. Can. Mineral. 44, 523-531.
    Iran
     
    • Esfahan Province (Isfahan Province; Aspadana Province)
      • Anarak District
    		Ondruš, P., Veselovský, F, Sejkora, J., Skála, R., Pažout, R., Frýda, J., Gabašová, A., Vajdak, J. (2005): Lemanskiite, NaCaCu5(AsO4)4Cl•5H2O, a new mineral species from the Abundancia mine, Chile. Can. Mineral. 44, 523-531.
    Spain
     
    • Murcia
      • Mazarrón-Águilas
        • Pastrana
    		Ondruš, P., Veselovský, F, Sejkora, J., Skála, R., Pažout, R., Frýda, J., Gabašová, A., Vajdak, J. (2005): Lemanskiite, NaCaCu5(AsO4)4Cl•5H2O, a new mineral species from the Abundancia mine, Chile. Can. Mineral. 44, 523-531.
    Mineral and/or Locality
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