cacholong

== English == === Etymology === From French cacholong, said to be from Cach (“the name of a river in Bukhara”) + Kalmyk чолун (çolun, “stone”). (This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.) === Noun === cacholong (plural cacholongs) (mineralogy) An opaque or milk-white chalcedony, a variety of quartz. (mineralogy) A similar variety of opal. === References === “cacholong”, in Mindat.org, Keswick, Va.: Hudson Institute of Mineralogy, 2000–2026.