Brazil (巴西)

Brazil is the world's most prolific gem mineral and pegmatite specimen producer, with mining roots dating to 17th-century gold and diamond rushes in Minas Gerais. The country's vast Precambrian shield contains some of the planet's richest Li-Be-Cs-rare-element pegmatite belts, alongside Cretaceous alkaline complexes (carbonatite REE), Paleozoic sedimentary diamonds, and Quaternary alluvial topaz-tourmaline gem fields.

The Eastern Brazilian Pegmatite Province — extending from Espírito Santo through Minas Gerais into Bahia and northeastern Brazil — produces world-best aquamarine, morganite, heliodor, multicolor tourmaline, kunzite spodumene, brazilianite, euclase, phenakite, topaz (especially imperial topaz from Ouro Preto), and giant smoky quartz crystals. Sub-districts each preserve distinct paragenesis: Linópolis is the brazilianite type-quality source, Conselheiro Pena yields gem aquamarine and tourmaline, Capão produces sherry and pink imperial topaz, and Ouro Preto offers the rare sky-blue euclase.

Beyond pegmatites, Brazil supplies amethyst geodes from Rio Grande do Sul (the world's largest amethyst source), agate beds in southern basaltic flows, citrine (mostly heat-treated amethyst), giant rose quartz crystals from Bahia, hematite (specularite micro-spheres) from Itabira, and golden rutilated quartz from Bahia. The country's gold heritage (Ouro Preto = "black gold") includes Au-Pd alloy, native gold in quartz, and historical telluride occurrences.