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Chovanite

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Formula:
Pb15-2xSb14+2xS36Ox (x ~ 0.2)
May contain minor Tl.
System:
Monoclinic
Colour:
Grey
Hardness:
3
Name:
Named after Prof. Martin Chovan (b. 1946) outstanding Slovak mineralogist, Department of Mineralogy and Petrology, Comenius University, Bratislava, Slovakia.
This page provides mineralogical data about Chovanite.

Classification of Chovanite

Approved 2009
2.JB.35e

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
J : Sulfosalts of PbS archetype
B : Galena derivatives, with Pb
3.10.4.

3 : SULFOSALTS
10 :
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http://www.mindat.org/min-39970.html
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First Recorded Occurrence of Chovanite

General Appearance of First Recorded Material:
Irregular aggregates up to 1 cm in size. Irregular or short prismatic grains up to 0.1 mm in length, intergrown with lamellae, needles and irregular patches of other Pb-Sb sulphosalts.
Place of Conservation of First Recorded Material:
Department of Materials Engineering and Physics, University of Salzburg, Salzburg, Austria (calalogue No. 14995); Department of Mineralogy and Petrology, National Museum, Prague, Czech Republic (catalogue No. P1P 13/2009); Department of Mineralogy and Pet
Geological Setting of First Recorded Material:
In hydrothermal antimony ore deposit.
Associated Minerals at First Recorded Locality:

Physical Properties of Chovanite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Grey
Hardness (Mohs):
3
Hardness (Vickers):
VHN25=213 - 238 kg/mm2
Comment:
Mohs hardness derived from VHN.
Tenacity:
Brittle
Cleavage:
Distinct/Good
parallel to the c axis
Density:
7.14 g/cm3 (Calculated)

Crystallography of Chovanite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Space Group Setting:
C2/m
Cell Parameters:
a = 48.189(48) Å, b = 4.1104(40) Å, c = 34.235(35) Å
β = 106.059(15)°
Ratio:
a:b:c = 11.724 : 1 : 8.329
Unit Cell Volume:
V 6517 ų
Z:
4
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.012 (39)
3.966 (39)
3.793 (23)
3.433 (100)
3.416 (22)
3.387 (31)
3.376 (27)
3.269 (29)
2.996 (26)
2.956 (21)
2.930 (23)
Comments:
Sample from Dúbrava, Slovakia.

Optical Data of Chovanite

Type:
Anisotropic
Anisotropism:
Moderate to strong both in air and oil.
Bireflectance:
Distinct in air, and further enhanced in oil.
Reflectivity:
400nmR1=42.7%R2= 44.0%
420nmR1=39.5%R2= 45.0%
440nmR1=39.3%R2= 44.5%
460nmR1=38.2%R2= 44.1%
480nmR1=37.8%R2= 43.5%
500nmR1=37.8%R2= 43.5%
520nmR1=37.4%R2= 43.4%
540nmR1=36.7%R2= 43.2%
560nmR1=36.6%R2= 42.6%
580nmR1=35.7%R2= 41.5%
600nmR1=35.1%R2= 40.9%
620nmR1=34.8%R2= 40.2%
640nmR1=34.3%R2= 39.4%
660nmR1=33.6%R2= 38.7%
680nmR1=33.0%R2= 37.5%
700nmR1=32.6%R2= 37.1%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 45.0%.
R1 shown in black, R2 shown in red
Colour in reflected light:
White
Internal Reflections:
Absent
Pleochroism:
Visible
Comments:
From white with a yellowish green tint (darkest position) to white with a faint bluish tint (lightest position).
Comments:
The optical properties are very similar to boulangerite.

Chemical Properties of Chovanite

Formula:
Pb15-2xSb14+2xS36Ox (x ~ 0.2)

May contain minor Tl.
Essential elements:
All elements listed in formula:
Analytical Data:
Average of 18 electron-microprobe analyses; sample from Dúbrava, Slovakia.
Ag (0.07)
Pb (50.72)
Sb (29.28)
Bi (0.10)
S (19.50)
Se (0.05)
Cl (0.04)
Total (99.76)
Empirical Formula:
Pb14.51Ag0.04(Sb14.26Bi0.03)(S36.06Se0.04Cl0.07)

Relationship of Chovanite to other Species

2.JB.05DiaphoriteAg3Pb2Sb3S8
2.JB.10CosalitePb2Bi2S5
2.JB.15FreieslebeniteAgPbSbS3
2.JB.15MarriteAgPbAsS3
2.JB.20CannizzaritePb4Bi6S13
2.JB.20WittitePb9Bi12(S,Se)27
2.JB.25aJunoiteCu2Pb3Bi8(S,Se)16
2.JB.25iNeyiteAg2Cu6Pb25Bi26S68
2.JB.25cNordströmiteCuPb3Bi7(Se4S10)
2.JB.25gNuffielditeCu1.4Pb2.4Bi2.4Sb0.2S7
2.JB.25dProuditeCuPb7.5Bi9.33(S,Se)22
2.JB.25hWeibullitePb5Bi8Se7S11
2.JB.25bFelbertaliteCu2Pb6Bi8S19
2.JB.25jRouxeliteCu2HgPb23Sb27S65.5
2.JB.25fÁngelaiteCu2AgPbBiS4
2.JB.25iCuproneyiteCu7Pb27Bi25S68
2.JB.30aGeocronitePb14(Sb,As)6S23
2.JB.30aJordanitePb14(As,Sb)6S23
2.JB.30bKirkiitePb10Bi3As3S19
2.JB.30cTsugaruitePb4As2S7
2.JB.35cPillaitePb9Sb10S23ClO0.5
2.JB.35aZinkenitePb9Sb22S42
2.JB.35bScainiitePb14Sb30S54O5
2.JB.35dPellouxite(Cu,Ag)Pb10Sb12S27O(Cl,S)0.6
2.JB.35fTubuliteAg2Pb22Sb20S53
2.JB.40bAschamalmitePb6Bi2S9
2.JB.40aBursaitePb5Bi4S11 (?)
2.JB.40bEskimoiteAg7Pb10Bi15S36
2.JB.40aFizélyiteAg5Pb14Sb21S48
2.JB.40aGustaviteAg3Pb5Bi11S24
2.JB.40aLillianitePb3-2xAgxBi2+xS6
2.JB.40cOurayiteAg3Pb4Bi5S13
2.JB.40aRamdohrite(Cd,Mn,Fe)Ag5.5Pb12Sb21.5S48
2.JB.40aRoshchiniteAg19Pb10Sb51S96
2.JB.40dSchirmeritePbAgBi3S6 - Pb3Ag1.5Bi3.5S9
2.JB.40aTreasuriteAg7Pb6Bi15S32
2.JB.40aUchucchacuaiteAgMnPb3Sb5S12
2.JB.40eUstarasitePb(Bi,Sb)6S10 (?)
2.JB.40aVikingiteAg5Pb8Bi13S30
2.JB.40aXilingolitePb3Bi2S6
2.JB.40bHeyrovskýitePb10AgBi5S18
2.JB.40UM1988-05-S:AgBiCuHgPb(Hg,Ag,Cu,Pb)5Pb5Bi11S27
2.JB.40UM1988-06-S:AgBiCuHgPb(Pb,Hg)12(Cu,Ag)3(Bi,Sb)10(S,Te)27
2.JB.40aAndorite IVPb18Ag15Sb47S96
2.JB.55GratonitePb9As4S15
2.JB.60MarrucciiteHg3Pb16Sb18S46
2.JB.65VurroitePb20Sn2(Bi,As)22S54Cl6

Other Names for Chovanite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Chovanite

Reference List:
Topa, D., Sejkora, J., Makovicky, E., Pršek, J., Ozdín, D., Putz, H., Dittrich, H. & Karup-Møller, S. (2012): Chovanite, Pb15-2xSb14+2xS36Ox (x ~ 0.2), a new sulphosalt species from the Low Tatra Mountains, Western Carpathians, Slovakia. European Journal of Mineralogy, 24, 727-740.

Internet Links for Chovanite

Localities for Chovanite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Italy
 
  • Tuscany
    • Lucca Province
      • Apuan Alps
        • Stazzema
          • Sant'Anna di Stazzema
Biagioni, C., Moëlo, Y., Orlandi, P. (2014): Lead-antimony sulfosalts from Tuscany (Italy). XV. (Tl-Ag)-bearing rouxelite from Monte Arsiccio mine: occurrence and crystal-chemistry. Mineralogical Magazine, 78, 651–661.
Slovakia
 
  • Žilina Region
    • Liptovský Mikuláš Co.
Topa, D., Sejkora, J., Makovicky, E., Pršek, J., Ozdín, D., Putz, H., Dittrich, H. & Karup-Møller, S. (2012): Chovanite, Pb15-2xSb14+2xS36Ox (x ~ 0.2), a new sulphosalt species from the Low Tatra Mountains, Western Carpathians, Slovakia. European Journal of Mineralogy, 24, 727-740.
      • Liptovské Kľačany
Topa, D., Sejkora, J., Makovicky, E., Pršek, J., Ozdín, D., Putz, H., Dittrich, H. & Karup-Møller, S. (2012): Chovanite, Pb15-2xSb14+2xS36Ox (x ~ 0.2), a new sulphosalt species from the Low Tatra Mountains, Western Carpathians, Slovakia. European Journal of Mineralogy, 24, 727-740.
      • Partizánska Lupča
Topa, D., Sejkora, J., Makovicky, E., Pršek, J., Ozdín, D., Putz, H., Dittrich, H. & Karup-Møller, S. (2012): Chovanite, Pb15-2xSb14+2xS36Ox (x ~ 0.2), a new sulphosalt species from the Low Tatra Mountains, Western Carpathians, Slovakia. European Journal of Mineralogy, 24, 727-740.
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