Kermesite

specimen number:
2133390

location:
Braunsdorf, Saxony, Germany

description:
Good German classic with deep reddish-brown acicular crystallized kermesite on matrix. In good condition.

Braunsdorf, a historic mining locality situated near Freiberg in Saxony, Germany (often historically generalized within the broader central German region), is celebrated for its highly concentrated hydrothermal silver-antimony vein deposits. Geologically, the area belongs to the peripheral zones of the classic Freiberg mining district within the Erzgebirge metamorphic complex, where Late Variscan structural fractures hosted rich mineralization of stibnite, silver-bearing sulfosalts, and native antimony in a quartz gangue. Industrial extraction was dominated by operations like the Neue Hoffnung Gottes mine, which tapped into these high-grade silver-antimony veins. Organized mining at the site began as early as the late seventeenth century and witnessed its most intensive and productive extraction periods during the eighteenth and nineteenth centuries. Shifting economic conditions and the depletion of easily accessible ore led to the gradual scale-back and eventual cessation of formal mining operations by the late 1800s, leaving the area renowned primarily as a classic mineral-collecting locality.

Kermesite is an antimony oxysulfide mineral that crystallizes in the triclinic system, typically forming as a secondary alteration product in the oxidized zones of antimony-bearing hydrothermal ore deposits. Geologically, it develops through the partial oxidation of primary antimony sulfides, most notably stibnite, under low-temperature surface or near-surface conditions. The mineral is visually distinctive, characteristically occurring as dense, radiating aggregates of cherry-red to dark red, needle-like or elongated prismatic crystals that exhibit a brilliant adamantine to semi-metallic luster.

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