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. 

Spaltiite, ideally Tl₂Cu₂As₂S₅ (Z = 4), is a new thallium sulfosalt mineral discovered at the renowned Lengenbach locality in the Binn Valley, Canton of Valais, Switzerland. Spaltiite is a distinctly layered structure, with alternation of polar As–Cu layers and two somewhat different types of thallium layers.

Keutschite, Cu₂AgAsS₄, is a new mineral from the Uchucchacua polymetallic deposit, Oyon District, Catajambo, Lima Department, Peru. The ideal formula, derived from the crystal structure, is Cu₂AgAsS_4. The name honours Frank Keutsch (Harvard University), a German chemist who first drew attention to the mineral during his study of the minerals of the alabandite zone of the Uchucchacua deposit.

We conducted this research to gain an understanding of the unknown crystal structure of mineral launayite, which contains elements like antimony, copper, and lead. Using advanced X-ray techniques, we solved its crystal structure and discovered new details, such as unit cell parameters, symmetry, and substitutions. These findings provide accurate information about its relationship with rouxelite.

We conducted this research to gain understanding of the mineral rouxelite, which contains elements like antimony, copper, mercury, and lead. Using advanced X-ray techniques, we re-examined its crystal structure and discovered new details, such as unit-cell parameters, symmetry, and substitutions. These findings provide accurate information about how the mineral forms and behaves. This work not only updates scientific knowledge of rouxelite but also offers insights into its chemical complexity.