Glossary Term
By Dr. Ömer Aksoy Mining Geology & Provenance Editor
A sedimentary rock composed primarily of three aluminum hydroxide minerals: gibbsite, böhmite, and diaspore. Bauxite is the world’s primary aluminum ore. Most bauxite-hosted diaspore occurs as fine crystals of no gem interest. The İlbir Mountains of Türkiye are unusual in producing transparent, gem-quality diaspore crystals large enough to facet.
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