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1 This must not be taken for the Sapphire of the present day, but was most probably Lapis lazuli, and identical, perhaps, with Cyanos. Beckmann has devoted considerable attention to this subject; Hist. Inv. Vol. I. pp. 468–473. Bohn's Edition.
2 Particles of iron pyrites, probably, which are frequently to be seen in Lapis lazuli.
3 Quartz, probably, according to some authorities.
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