Fluor-liddicoatite[7] is a rare member of the tourmaline group of minerals, elbaite subgroup, and the theoretical calcium endmember of the elbaite-fluor-liddicoatite series; the pure end-member has not yet been found in nature.

[8][9] Formulae are Fluor-liddicoatite was named in 1977 after Richard T. Liddicoat (1918–2002) gemmologist and president of the Gemological Institute of America,[2] who is well known for introducing the GIA diamond grading system in 1953.

The boron B ions occur in triangular coordination, each triangle sharing a common apex with two Y octahedra.

[10][11] Crystals are stout prismatic, with a curved convex trigonal outline, generally elongated and striated parallel to the c axis.

[3] The color is usually smoky brown, but also pink, red, green, blue, or rarely white.

[12] The streak is white to very light brown, lighter than the mass color, luster is vitreous and crystals are transparent to translucent.

Fluor-liddicoatite is detrital in soil at the type locality, presumably derived from the weathering of granitic pegmatites.