Fresnelilait

Fresnelilait is a rare phosphate mineral with the chemical formula NaCaMg2(PO4)3. It is a member of the monazite supergroup and is characterized by its monoclinic crystal system. The mineral was first discovered in 2012 from the Fregat meteorite, which fell in the Urals region of Russia in 1987. Its name honors Augustin-Jean Fresnel, a pioneer in the study of light and optics.

The typical appearance of fresnelilait is as small, irregularly shaped grains. It often occurs in association with other phosphates found in meteorites. The color can range from colorless to pale yellow or pinkish. Spectroscopic analysis has been crucial in its identification and characterization. While primarily found in extraterrestrial material, the possibility of its terrestrial occurrence in specific geological environments cannot be entirely ruled out, though it has not yet been confirmed. Its discovery highlights the diversity of mineral phases that can form under the unique conditions present during meteorite formation.