Millisite

Millisite is a rare phosphate mineral. The mineral was named after Mr. F. T. Millis of Lehi, Utah.^[1] Millisite can be found in altered phosphate deposits.^[2]

Millisite
Pale yellow globular aggregates of millisite from Fairfield, Utah
General
Category	Phosphate minerals
Formula	NaCaAl6(PO4)4(OH)9·H2O

Occurrence

Millisite was originally only known to occur in Fairfield, Utah and Thiès, Sénégal.^[3] It has since been identified in the Bone Valley Formation of Florida, where it forms a major component of the aluminum phosphate zone.