Colombinite is a rare niobium-rich mineral related to the pyrochlore group, found in select pegmatitic environments. This example from Colombia shows the classic dark, resinous exterior with subtle pitting and a slightly translucent glow when backlit—an uncommon trait for this typically opaque material. Its high specific gravity and dense structure make it notable for collectors interested in rare tantalum-niobium species.
26.72 grams / 133.6 carats / 32.6 x 29.9 x 23.3 mm
Estimate: $225 - $250
