Mineralogy, Crystallinity, O18/O16, and D/H of Georgia …
The crystallinity of the <0.5-, 0.5–1.0-, and 1.0–2.0- µm size fractions of soft kaolins was higher than that of equivalent size fractions of hard kaolins. δ O 18 and δ D of the soft and hard kaolins ranged between 18.5 to 23.1‰, and −64 to −41‰, respectively, and could not be used to discriminate soft from hard kaolins.