Haggertyite is a rare

barium Barium is a chemical element with the symbol Ba and atomic number 56. It is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Because of its high chemical reactivity, barium is never found in nature as a free element. Th ...

iron Iron () is a chemical element with symbol Fe (from la, ferrum) and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, right in f ...

magnesium Magnesium is a chemical element with the symbol Mg and atomic number 12. It is a shiny gray metal having a low density, low melting point and high chemical reactivity. Like the other alkaline earth metals (group 2 of the periodic ta ...

titanate In chemistry, titanate usually refers to inorganic compounds composed of titanium oxides. Together with niobate, titanate salts form the Perovskite group. In some cases, the term is used more generally for any titanium-containing anion, e.g. iC ...

mineral: Ba(Fe²⁺₆Ti₅Mg)O₁₉ first described in 1996 from the

Crater of Diamonds State Park Crater of Diamonds State Park is a Arkansas state park in Pike County, Arkansas, in the United States. The park features a 37.5-acre (15.2 ha) plowed field, the world's only diamond-bearing site accessible to the public. Diamonds have continuou ...

near

Murfreesboro Murfreesboro is a city in and county seat of Rutherford County, Tennessee, United States. The population was 152,769 according to the 2020 census, up from 108,755 residents certified in 2010. Murfreesboro is located in the Nashville metropol ...

Pike County, Arkansas Pike County is a county located in the U.S. state of Arkansas. As of the 2010 census, the population was 11,291. The county seat is Murfreesboro. Pike County is Arkansas's 25th county, formed on November 1, 1833, and named for Lieutenant Zebulo ...

. The microscopic metallic mineral crystallizes in the

hexagonal In geometry, a hexagon (from Greek , , meaning "six", and , , meaning "corner, angle") is a six-sided polygon. The total of the internal angles of any simple (non-self-intersecting) hexagon is 720°. Regular hexagon A '' regular hexagon'' has ...

system and forms tiny hexagonal plates associated with richterite and serpentinitized

olivine The mineral olivine () is a magnesium iron silicate with the chemical formula . It is a type of nesosilicate or orthosilicate. The primary component of the Earth's upper mantle, it is a common mineral in Earth's subsurface, but weathers quickl ...

mafic A mafic mineral or rock is a silicate mineral or igneous rock rich in magnesium and iron. Most mafic minerals are dark in color, and common rock-forming mafic minerals include olivine, pyroxene, amphibole, and biotite. Common mafic rocks include ...

xenolith A xenolith ("foreign rock") is a rock fragment (country rock) that becomes enveloped in a larger rock during the latter's development and solidification. In geology, the term ''xenolith'' is almost exclusively used to describe inclusions in igne ...

s in the

lamproite Lamproite is an ultrapotassic mantle-derived volcanic or subvolcanic rock. It has low CaO, Al2O3, Na2O, high K2O/Al2O3, a relatively high MgO content and extreme enrichment in incompatible elements. Lamproites are geographically widespread ye ...

host rock. It is an iron(II) rich member of the

magnetoplumbite group Magnetoplumbite is a iron- and lead based mineral. It is member of the magnetoplumbite group of minerals. Its type locality is Långban, Sweden References

{{mineral-stub Lead minerals Iron minerals Manganese minerals Minerals described in ...

. It is a light grey opaque mineral with calculated

Mohs hardness The Mohs scale of mineral hardness () is a qualitative ordinal scale, from 1 to 10, characterizing scratch resistance of various minerals through the ability of harder material to scratch softer material. The scale was introduced in 1812 by th ...

of 5. It was named for

geophysicist Geophysics () is a subject of natural science concerned with the physical processes and physical properties of the Earth and its surrounding space environment, and the use of quantitative methods for their analysis. The term ''geophysics'' som ...

Stephen E. Haggerty (born 1938) of the

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References

* 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. 1323-132
Am. Min. abstract
Barium minerals Titanium minerals Magnesium minerals Iron(II) minerals Oxide minerals Hexagonal minerals Minerals in space group 194 {{oxide-mineral-stub