ʻO ka alumina kristal nui hoʻokahi he aniani pauka keʻokeʻo i hana ʻia e ka calcination kiʻekiʻe o ka alumini hydroxide a i ʻole alumina ʻoihana me ka mineralizer kūikawā.
Loaʻa i ka flake alumina nā waiwai intrinsic maikaʻi loa a me nā ʻano hoʻolālā kūikawā.