from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A relatively large crystal occurring in a mineral deposit, usually defined as one between 0.5 mm and 10 mm in size.
macro- + cryst. First defined by Clement & Skinner in 1979 in their paper "A textural genetic classification of kimberlite rocks" published in Kimberlite Symposium II. (Wiktionary)