Epigenetic polycrystalline boehmite nestled in a fissure of an unheated purple metamorphic sapphire

Discover the hidden wonders of gemstones! Our latest micrograph showcases epigenetic polycrystalline boehmite (AlO(OH)) nestled in a fissure of an unheated purple metamorphic sapphire from Bakatundi, Pakistan. Boehmite often appears as an epigenetic inclusion, but in certain deposits, it forms syngenetically, as seen in rubies from Mong Hsu, Myanmar, often accompanied by its polymorph, diaspore (AlO(OH)).

🔬 Micrographie: F. Notari.

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