Chovanite (original) (raw)

A valid IMA mineral species

About ChovaniteHide

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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

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. He has performed extensive studies of antimony mineralization in the Western Carpathians. Pronunciation of the name is ‘‘khovanite’.

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.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:39970:6

566c2a65-f0a2-4534-a3b3-563f7939604e

IMA Classification of ChovaniteHide

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IMA Formula:

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

Type description reference:

Topa, D., Sejkora, J., Makovicky, E., Pršek, J., Ozdín, D., Putz, H., Dittrich, H. and 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.

Classification of ChovaniteHide

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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 :

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of ChovaniteHide

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Hardness:

VHN25=213 - 238 kg/mm2 - Vickers

Comment:

Mohs hardness derived from VHN.

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

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Anisotropism:

Moderate to strong both in air and oil.

Bireflectance:

Distinct in air, and further enhanced in oil.

Reflectivity:

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

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.

Chemistry of ChovaniteHide

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Mindat 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

Crystallography of ChovaniteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

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

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 8 Å 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)°.

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

Sample from Dúbrava, Slovakia.

Geological EnvironmentHide

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Geological Setting:

Monte Arsiccio mine (vugs in metadolostones)

Type Occurrence of ChovaniteHide

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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 Mineralogy and Petrography of the NHM Vienna (cat. no. O 2406) (formerly in the collection of the Department of Materials Engineering and Physics, Univ. of Salzburg, former cat. no. 14995); Department of Mineralogy and Petrology, National Museum, Prague, Czech Republic (catalogue No. P1P 13/2009); Department of Mineralogy and Petrology, Faculty of Natural Sciences, Comenius University, Bratislava, under (catalogue no. 7282).

Geological Setting of Type Material:

In hydrothermal antimony ore deposit.

Associated Minerals at Type Locality:

Reference:

Topa, D., Sejkora, J., Makovicky, E., Pršek, J., Ozdín, D., Putz, H., Dittrich, H. and 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.

Synonyms of ChovaniteHide

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Other Language Names for ChovaniteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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Health Risks:

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

Internet Links for ChovaniteHide

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References for ChovaniteHide

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Reference List:

Topa, D., Sejkora, J., Makovicky, E., Pršek, J., Ozdín, D., Putz, H., Dittrich, H. and 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.

Localities for ChovaniteHide

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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

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.