Articles | Volume 38, issue 2
https://doi.org/10.5194/ejm-38-217-2026
https://doi.org/10.5194/ejm-38-217-2026
New minerals, nomenclature, and classification
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23 Apr 2026
New minerals, nomenclature, and classification |  | 23 Apr 2026

Lopatkaite, a new mineral from Taylor Pit, Madoc, Ontario, Canada

Dan Topa, Emil Makovicky, Hubert Putz, and Georg Zagler
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Latest update: 23 Apr 2026
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Short summary
Lopatkaite, ideally Pb10As2Sb6S22 (Z = 4), is a new arsenic-bearing sulfosalt species found in the Madoc deposit, Taylor Pit, Ontario, Canada. Associated minerals in the holotype specimen are boulangerite, veenite, and sterryite, all embedded in a calcite matrix. The ideal formula may be derived from the ideal boulangerite formula, Pb10Sb8S22 (Z = 4), by a substitution of 2Sb with 2As. Lopatkaite is a homeotype of boulangerite and a new member of the rod-based family of sulfosalts. 
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