The rock "mozarkite" is the official rock and lithologic emblem of Missouri.
Mo. Rev. Stat. § 10.045
State lithologic emblem
Effective: 28 Aug 1967; (L. 1967 p. 93 § 1)
Official source: Missouri Revisor of Statutes. Reproduced from public-domain Missouri statutes; confirm against the official source for the current text. Not legal advice.