Antimony with Paakkonenite, Seinajokite(?)

specimen number:
9302390

location:
Routakallio Quarry, Seinajoki, South Ostrobothnia, Finland

description:
An absolutely fantastic example for the species. Bright lustrous crystallized native antimony on a small amount of matrix. The rare mineral paakkonenite is present, as well as possibly seinajokite. from the classic type locality for the species.

The Routakallio Quarry in Seinajoki, South Ostrobothnia, Finland, functions primarily as a small localized rock extraction site rather than a major industrial mine, meaning precise commercial opening and closing dates are not formally documented, though it is well known in mineralogical circles as a source of rare specimens originating from mid-twentieth-century or later prospecting and quarrying activities. Geologically, the site is situated within the Proterozoic schist belt of the Seinajoki ore district, which borders the Central Finland granitoid complex. This regional geology features metamorphic rocks such as mica schists and gneisses hosting specialized hydrothermal mineral associations. The quarry is especially famous as a type locality for rare antimony-bearing phases, where native antimony occurs alongside unique sulfosalts in quartz and pyrrhotite veins formed under conditions of low sulfur fugacity.

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