1) jasper, a precious stone of various colours (for some are
    purple, others blue, others green, and others the colour of brass)
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 There is one kind called the Aeizusa, like to air and another
 Crystallizusa, clear as crystal. So Pliny speaks of a white Jasper
 called Astrios, and which, he says is "crystallo propinquans", near
 to crystal, found in India, and on the shores of Pallene. (Gill)