The word "OINX" is often spelled incorrectly as "ONYX". The correct spelling is derived from its Greek origin, which is spelled οὖνοχοος. The phonetic transcription of "OINX" is /oʊɪŋks/, with the "oi" representing the diphthong sound of "oy" and the "x" representing the consonant cluster of "ks". The word refers to a type of mineral that is often used in jewelry and decorative items, which has a shiny black color and a smooth texture.