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looking at this crossword definition, it has 19 letters.
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Possible Answers:
Onyx.
Last seen on: Daily Celebrity Crossword – 3/11/23 Smartypants Saturday
Random information on the term ” Onyx”:
Jasper, an aggregate of microgranular quartz and/or cryptocrystalline chalcedony and other mineral phases, is an opaque, impure variety of silica, usually red, yellow, brown or green in color; and rarely blue. The common red color is due to iron(III) inclusions. Jasper breaks with a smooth surface and is used for ornamentation or as a gemstone. It can be highly polished and is used for items such as vases, seals, and snuff boxes. The specific gravity of jasper is typically 2.5 to 2.9. Jaspillite is a banded-iron-formation rock that often has distinctive bands of jasper.
The name means “spotted or speckled stone,” and is derived via Old French jaspre (variant of Anglo-Norman jaspe) and Latin iaspidem (nom. iaspis) from Greek ἴασπις iaspis (feminine noun), from an Afroasiatic language (cf. Hebrew ישפה yashpeh, Akkadian yashupu). This Semitic etymology is believed to be unrelated to that of the English given name Jasper, which is of Persian origin, though the Persian word for the mineral jasper is also yashp (یَشم).