AMETHYSTINE • DICTIONARY ONE.COM • Definition of Amethystine

... Within the awful centre of the earth, Where, earliest, we had our holy birth— In some huge cavern, arching wide below, Upon whose airy pivot, years ago, The world went round: 'tis infinitely deep, But never dismal; for above it sleep, And under it, blue waters, hung aloof, And held below,—an amethystine roof, A sapphire pavement; and the golden sun, Afar, looks through alternately, like one That watches round some treasure: often, too, Through many a mile of ocean, sparkling through, Are seen the stars and moon, all gloriously, Bathing their angel ...

— The Death-Wake - or Lunacy; a Necromaunt in Three Chimeras • Thomas T Stoddart