microphenocryst
English edit
Etymology edit
micro- + phenocryst
Noun edit
microphenocryst (plural microphenocrysts)
- (geology) A very small crystal in a fine-grained porphyritic rock.
- 1983, U.S. Geological Survey Bulletin, page 9:
- The basalt of Goose Island of the Ice Harbor Member is unique for the occurrence of microphenocrysts of ilmenite and titanmagnetite.