Formula: KLi₂Al(Si₄O₁₀)(F,OH)₂

Species: Silicates – (Phyllosilicates)

Colour: white, gray, violet, light green, brownish, pinkish

Lustre: Pearly

Hardness: 2 – 3

Crystal System: Monoclinic

Member of: Trioctahedral mica Group > Mica Group; Polylithionite-Trilithionite Series.

Name: From the Greek “POLY,” for many or much, and in allusion to its composition with a high LITHIum content.

Type Locality: Kangerluarsuk Fjord, Ilímaussaq complex, Kujalleq, Greenland