Gold

Gold (Au) is the archetypal native element mineral: soft, extraordinarily malleable, chemically inert, and prized for its unmistakable warm yellow luster. It crystallizes in the isometric system, typically as cubes, octahedra, and dodecahedra, though true well-formed crystals are rare — most gold occurs as irregular grains, wires, dendrites, or flattened leaf-like growths, often intergrown with quartz, calcite, pyrite, or arsenopyrite in low-temperature hydrothermal veins. When alloyed with silver it forms electrum, a related and equally collectible native alloy. Because gold resists tarnish indefinitely, specimens recovered even from ancient placer gravels retain their full brilliance, making it one of the most visually rewarding species in any mineral collection.