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Category Oxide mineral
(repeating unit)
Strunz classification 4.CC.45
Crystal system Hexagonal
Crystal class Dihexagonal dipyramidal (6/mmm)
H-M symbol: (6/m 2/m 2/m)
Space group P63/mmc
Unit cell a = 5.926, c = 23.32 [Å]; Z = 2
Color Gray
Crystal habit Microscopic hexagonal platelets
Mohs scale hardness 5
Luster Metallic
Diaphaneity Opaque
Specific gravity 4.87 (calculated)
References [1][2]

Haggertyite is a rare barium, iron, magnesium, titanate mineral: Ba(Fe2+6Ti5Mg)O19 first described in 1996 from the Crater of Diamonds State Park near Murfreesboro in Pike County, Arkansas. The microscopic metallic mineral crystallizes in the hexagonal system and forms tiny hexagonal plates associated with richterite and serpentinitized olivine of mafic xenoliths in the lamproite host rock. It is an iron(II) rich member of the magnetoplumbite group. It is a light grey opaque mineral with calculated Mohs hardness of 5.

It was named for geophysicist Stephen E. Haggerty (born 1938) of the Florida International University.


  • Grey, I. E., Danielle Velde, and A. J. Criddle, 1998, Haggertyite, a new magnetoplumbite-type titanate mineral from the Prairie Creek (Arkansas) lamproite: American Mineralogist, v. 83, p. 1323-1329 Am. Min. abstract