Phosphoric Rune Turquoise

Greek phōsphóros, light-bringer — adjectival suffix -ic. As a color modifier, phosphoric implies a saturated-and-cool-glow quality, the bright color of match-tip-strike and firefly phosphorus-emission luminescence. Sits at the bright-and-cool end of the grid, parallel to phosphorescent and fluorescent in usage.

Old Norse rún, secret-or-runic-letter. As a color modifier, rune implies a Norse-runic-letter-and-Futhark-and-incised-stone quality, the visual register of Elder-Futhark-and-Norse-runic-stone hand-Norse-runic-letter-and-Futhark-and-incised-stone Elder-Futhark-and-Norse-runic-stone-and-Viking-grave-marker rune-and-Norse-runic-letter-and-Futhark surfaces under Elder-Futhark-and-Norse-runic-stone-and-Viking-grave-marker Jelling-stone-and-Rök-runestone runic-incision-light. Sits at the modifier-and-myth end of the grid, parallel to omen and sigil in usage.

The hydrated copper-aluminum phosphate mined in Persia and the American Southwest for thousands of years — the firuze of Iran, the chalchihuitl of Mesoamerica, the heart of Pueblo and Navajo silverwork. The color refers to a fine Sleeping Beauty turquoise from Arizona: a saturated, slightly green-shifted blue with the slight matrix of host-rock veining. Brighter than persian, lighter than cerulean.