Table of Contents
Phonetic transcription
Definition#
any of a group of hard glassy minerals of variable colour consisting of complex borosilicates of aluminium with quantities of lithium, sodium, calcium, potassium, iron, and magnesium in hexagonal crystalline form: used in optical and electrical equipment and in jewellery
Collins Dictionary
https://www.collinsdictionary.com/dictionary/english/tourmaline
Syn:
Phraseology#
Literary quotes#
Encyclopaedic notes#
In fact, tourmaline has one of the widest color ranges of any gem species, occurring in various shades of virtually every hue
Gemological Institute of America (GIA) website
https://www.gia.edu/tourmaline-description
