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The major localities which rate their own, separate chapters are a sensible mix of old and new: various recent sources in China; the Deccan traprocks of India; Dal'negorsk, Russia; Cumbria, England; Andreasberg, Harz Mountains, Germany; Maramures, Romania; "the American heartland" (this one could have used subdivision); the Michigan Copper Country; and Irai, Rio Grande do Sul, Brazil.
The datolite crystals are transparent, lustrous, very pale green, and of tabular habit, to 2 cm across; the best matrix specimens hold up well in comparison with those from the northern New Jersey traprocks.