noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A hexagonal-pyramidal colorless mineral containing aluminum, oxygen, potassium, and silicon.

Etymology

From mega- + kalsilite, because it is identical in chemical formula with kalsilite, but its unit cell is 12 times larger.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.