brotocrystal
Noun
Meaning
brotocrystal (plural brotocrystals)
(mineralogy) A phenocryst whose corroded or embayed outline proves that it was formed prior to the eruptive stage.
Noun
brotocrystal (plural brotocrystals)
(mineralogy) A phenocryst whose corroded or embayed outline proves that it was formed prior to the eruptive stage.