Millisite

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

Occurrence

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