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object

Opal

Objects · Colors & materials

A named play-of-color silica of later jewelry and older omen-speech. Not generic crystal, and not a moonstone dump.

  • Opal is used in Medicine.

    Pliny’s Natural History treats opalus among precious stones praised for color-play and entered in gem remedy speech. A Roman-era pharmacological use of opal, not moonstone as a modern feldspar dump and not pearl as the nacre bead already walked.

    from Pliny the Elder · Natural History, c. 77 CE

    used in · sourced · documented

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