Scainiite Locality: Strieborna vein, Ludovit Mine, Dúbrava , Northern Low Tatra Mts, Žilina Region , Slovakia ( Locality at mindat.org ) Size: small cabinet, 7.0 x 4.5 x 2.4 cm Scainiite Scainiite is a VERY rare lead-antimony sulfide. The mineral was known only in a few, poor specimens from this locality until recently (I am told these were collected in 2009), as you can see from the few photos of smears on a rock, shown on MINDAT. Even at its type locality, 3 mm crystals would be considered large. Here you have, however, 7 cm-long carpet of flatlaying crystals on matrix. They are embedded, and grown in aggregate, but still are huge examples of the species and this is one of the more rich specimens recovered. — Photo: Robert M. Lavinsky · CC BY-SA 3.0
Scainiite
Scainiite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Pb₁₄Sb₃₀S₅₄O₅.
It crystallizes in the monoclinic crystal system (space group C2/m).
Key properties: specific gravity 5.56; Bluish metallic luster.
IMA symbol Scn, IMA status: approved, named in 1996.
Found in late-stage hydrothermal calcite veins that cut Ba-Fe ores.
It is found associated with Sphalerite, cinnabar, galena, tetrahedrite, chalcostibite, gersdorffite, barite, cerussite, stibiconite.
The mineral was named to honor engineer and mineralogist Dr. Giuseppe Scaini (1906-1988).