Calcite from Mashamba West Mine, Sicomines copper-cobalt project, Mutshatsha, Lualaba, DR Congo

Calcite var. Cobaltoan with Kolwezite

Mashamba West Mine, Kolwezi District, Katanga, DR Congo

6.9 x 4.6 x 4.4 cm

ex. Stephanie Joplin Collection

A striking, gemmy scalenohedral calcite crystal saturated with cobalt, glowing magenta-violet at its core and fading to a soft blush pink toward the edges and sharp termination. A smaller calcite grows alongside it in parallel orientation. Anchoring the piece is a bold 4 cm patch of dark olive-green kolwezite, its drusy texture standing in dramatic contrast against the pink calcite — a vivid pairing that showcases the copper-cobalt mineralization this locality is known for.