the.com/pegmatite
Magma's last words, crystallized — slow cooling lets minerals grow absurdly huge.
means A coarse-grained igneous rock made of unusually large interlocking crystals, formed from the last watery, mineral-rich leftovers of a cooling magma.
from From French pegmatite, coined from Greek pegma ('something fastened together,' from pegnynai, 'to fasten'), a nod to the rock's interlocking crystal framework. The name was given in the early 19th century by French mineralogist René Just Haüy, who was struck by how tightly the giant crystals of quartz, feldspar, and mica lock into one another.
- crystal size
- can exceed several meters long
- formation
- forms from water-rich leftover magma
- gem source
- yields tourmaline, beryl, topaz
- lithium bonus
- major source of spodumene for batteries