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Chovanite

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Formula:
Pb15-2xSb14+2xS36Ox (x ~ 0.2)
May contain minor Tl; the Monte Arsiccio material has a formula close to TlPb26(Sb,As)31S72O, while the Pollone's one is close to Pb28(Sb,As)30S72O
Colour:
Grey, black
Lustre:
Metallic
Hardness:
3
Specific Gravity:
6.029 (Calculated)
Crystal System:
Monoclinic
Name:
Named after Prof. Martin Chovan (b. 1946) outstanding Slovak mineralogist, Department of Mineralogy and Petrology, Comenius University, Bratislava, Slovakia.
The single oxygen atom in the structure is bound to two (Sb,As) atoms, which alternate with vacant positions along b; this feature is also observed in other Pb oxy-sulphosalts like scainiite. The material from the Pollone mine has the 8 Å structure, modular, which is topologically derived from pellouxite.


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Classification of ChovaniteHide

Approved
Approval Year:
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 :

Physical Properties of ChovaniteHide

Metallic
Transparency:
Opaque
Colour:
Grey, black
Hardness:
Hardness:
VHN25=213 - 238 kg/mm2 - Vickers
Comment:
Mohs hardness derived from VHN.
Tenacity:
Brittle
Cleavage:
Distinct/Good
parallel to the c axis
Density:
6.029 g/cm3 (Calculated)
Comment:
(The published 7.14 seems to be an error?)

Optical Data of ChovaniteHide

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 ChovaniteHide

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

May contain minor Tl; the Monte Arsiccio material has a formula close to TlPb26(Sb,As)31S72O, while the Pollone's one is close to Pb28(Sb,As)30S72O
IMA Formula:
Pb15-2xSb14+2xS36Ox; (x~0.2)

Crystallography of ChovaniteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
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 V:
6517 ų
Z:
4
Morphology:
acicular crystals from Monte Arsiccio are up to 5 mm in length; thick acicular crystals from the Pollone mine are up to 1 cm in length
Comment:
Pollone mine material parameters: a=48.38(5), b=4.11(4), c=34.18(4) Å, β=106.26°; the 8Å structural type has the space group P21/a and the unit cell parameters a=34.052(3), b=8.2027(7), c=48.078(4) Å, β=106.258(4)°

X-Ray Powder DiffractionHide

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.

Type Occurrence of ChovaniteHide

General Appearance of Type 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 Type 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 Type Material:
In hydrothermal antimony ore deposit.
Associated Minerals at Type Locality:

Synonyms of ChovaniteHide

Other Language Names for ChovaniteHide

Common AssociatesHide

BaryteBaSO4
DolomiteCaMg(CO3)2
Hyalophane(K,Ba)[Al(Si,Al)Si2O8]
QuartzSiO2
RobinsonitePb4Sb6S13
RouxeliteCu2HgPb23Sb27S65.5
SphaleriteZnS
ValentiniteSb2O3

Related Minerals - Nickel-Strunz GroupingHide

2.JB.Andorite VIAgPbSb3S6Orth. mm2 : Pmn21
2.JB.05DiaphoriteAg3Pb2Sb3S8Mon. 2/m : P21/b
2.JB.10CosalitePb2Bi2S5Orth. mmm (2/m 2/m 2/m)
2.JB.15FreieslebeniteAgPbSbS3Mon. 2/m : P21/b
2.JB.15MarriteAgPbAsS3Mon. 2/m : P21/b
2.JB.20CannizzaritePb48Bi56S132Mon. 2/m : P21/m
2.JB.20WittitePb9Bi12(S,Se)27Mon.
2.JB.25aJunoiteCu2Pb3Bi8(S,Se)16Mon. 2/m : B2/m
2.JB.25iNeyiteAg2Cu6Pb25Bi26S68Mon.
2.JB.25cNordströmiteCuPb3Bi7(Se4S10)Mon.
2.JB.25gNuffielditeCu1.4Pb2.4Bi2.4Sb0.2S7Orth.
2.JB.25dProuditeCuPb7.5Bi9.33(S,Se)22Mon. 2/m : B2/m
2.JB.25hWeibullitePb5Bi8Se7S11Orth.
2.JB.25bFelbertaliteCu2Pb6Bi8S19Mon. 2/m : B2/m
2.JB.25jRouxeliteCu2HgPb23Sb27S65.5Mon. 2/m : B2/m
2.JB.25fÁngelaiteCu2AgPbBiS4Orth. mmm (2/m 2/m 2/m) : Pnma
2.JB.25iCuproneyiteCu7Pb27Bi25S68Mon. 2/m : B2/m
2.JB.30aGeocronitePb14(Sb,As)6S23Mon. 2/m : P21/m
2.JB.30aJordanitePb14(As,Sb)6S23Mon. 2/m : P21/m
2.JB.30bKirkiitePb10Bi3As3S19Mon. 2/m : P21/m
2.JB.30cTsugaruitePb4As2S7Orth.
2.JB.35cPillaitePb9Sb10S23ClO0.5Mon. 2/m : B2/m
2.JB.35aZinkenitePb9Sb22S42Hex. 6 : P63
2.JB.35bScainiitePb14Sb30S54O5Mon. 2/m : B2/m
2.JB.35dPellouxite(Cu,Ag)Pb10Sb12S27O(Cl,S)0.6Mon. 2/m : B2/m
2.JB.35fTubuliteAg2Pb22Sb20S53 Mon. m : Pb
2.JB.40bAschamalmitePb6Bi2S9Mon. 2/m
2.JB.40aBursaitePb5Bi4S11 (?)Orth.
2.JB.40bEskimoiteAg7Pb10Bi15S36Mon.
2.JB.40aFizélyiteAg5Pb14Sb21S48 Mon. 2/m
2.JB.40aGustaviteAgPbBi3S6Orth. mmm (2/m 2/m 2/m)
2.JB.40aLillianitePb3-2xAgxBi2+xS6Orth. mmm (2/m 2/m 2/m)
2.JB.40cOurayiteAg3Pb4Bi5S13Orth.
2.JB.40aRamdohritePb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24Mon. 2/m
2.JB.40aRoshchiniteAg19Pb10Sb51S96Orth.
2.JB.40dSchirmeritePbAgBi3S6 - Pb3Ag1.5Bi3.5S9Orth.
2.JB.40aTreasuriteAg7Pb6Bi15S32Mon.
2.JB.40aUchucchacuaiteAgMnPb3Sb5S12Orth. mmm (2/m 2/m 2/m) : Pmmm
2.JB.40eUstarasitePb(Bi,Sb)6S10 (?)
2.JB.40aVikingiteAg5Pb8Bi13S30Mon. 2/m : B2/m
2.JB.40aXilingolitePb3Bi2S6Mon.
2.JB.40bHeyrovskýitePb6Bi2S9Orth. mmm (2/m 2/m 2/m) : Cccm
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 IVPb18Ag15Sb47S96Mon. 2 : P2
2.JB.55GratonitePb9As4S15Trig. 3m : R3m
2.JB.60MarrucciiteHg3Pb16Sb18S46Mon. 2/m : B2/m
2.JB.65VurroitePb20Sn2(Bi,As)22S54Cl6Orth.

Other InformationHide

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 ChovaniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
Biagioni, C. & Moëlo, Y. (2017). Lead-antimony sulfosalts from Tuscany (Italy). XIX. Crystal chemistry of chovanite from two new occurrences in the Apuan Alps and its 8 Å crystal structure. Mineralogical Magazine, 81, 811-831.

Internet Links for ChovaniteHide

Localities for ChovaniteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Italy
 
  • Tuscany
    • Lucca Province
      • Apuan Alps
        • Pietrasanta
          • Valdicastello Carducci
Biagioni C., Moëlo Y., Orlandi P. (2014): Apuan Alps: a reference ore district for the study of sulfosalt crystal-chemistry. Plinius, 40, 296.
        • 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.
Gunnar Färber
Slovakia (TL)
 
  • 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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