Brilliant, metallic, golden luster, highlights this specimen with several octahedral crystals, to 1 cm across. These are flattened, elongated, and extremely sharp and dramatic. The thumbnail specimen as a whole is quite hefty, not wimpy at all as it looks in a flat picture, and these are crystals that REALLY stand out in person even more. The luster is the top one percentile, truly spectacular and visually impressive beyond its size. The color, luster and form, all make this a world class thumbnail!