Definition of phyllosilicate in English:

phyllosilicate

noun

Mineralogy
  • Any of the large subclass of silicate minerals characterized by SiO₄ tetrahedra linked in sheets of indefinite extent in which the ratio of silicon and aluminium to oxygen is 2:5, important members of which include mica, serpentine, talc, chlorite, and the clay minerals.

Origin

1940s; earliest use found in Mineralogical Abstracts. From phyllo- + silicate, after German Phyllosilikat.