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Crater of Diamonds State Park (Arkansas Diamond Corp. Mine; Mauney Mine; Ozark Mine; Prairie Creek Lamproite), Murfreesboro, Pike Co., Arkansas, USA

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Latitude & Longitude (WGS84): 34° 2' 0'' North , 93° 40' 21'' West
Latitude & Longitude (decimal): 34.0333333333, -93.6725

Diamonds were discovered at this location in 1906. Now a fee-based collecting site.

Four major rock types occur: magmatic lamproite (with mantle and crust-derived xenoliths); marr epiclastics (largely sandstone); lamproite lapilli tuff (phlogopite-rich); and lamproite breccia tuff. These last two types are the source of most of the diamonds recovered in the visitor area.

Haggertyite is present as microscopic hexagonal plates in the alteration zones of xenoliths in Prairie Creek lamproite.

The Prairie Creek Lamproite is Early Cretaceous (106mya) in age.

Mindat Articles

5. Diamonds R Waiting 4U At The Crater of Diamonds State Park by Frank Festa
TGMS 2008 - The Crater of Diamonds by Jolyon & Katya Ralph

Mineral List

Mineral list contains entries from the region specified including sub-localities

26 valid minerals. 1 (TL) - type locality of valid minerals.

Rock Types Recorded

Entries shown in red are rocks recorded for this region.

Note: this is a very new system on and data is currently VERY limited. Please bear with us while we work towards adding this information!

Rock list contains entries from the region specified including sub-localities

Regional Geology

This information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This data will improve over time as more accurate maps and data sets are added.

Cretaceous66 - 145 MaCretaceous sedimentary rocks

Sedimentary rocks

Cretaceous66 - 145 MaIgneous rocks

Major:: {alkalic intrusive rock},Minor:: {nepheline syenite},Incidental:: {syenite, intrusive carbonatite, trachyte, lamprophyre}

Includes undifferentiated altered sedimentary rocks of Paleozoic age at Granite Mountain, Pulaski County, and Mufreesboro, Pike County. Acid to intermediate - Nepheline syenite complexes at Magnet Cove and Potash Sulfur Springs, stocks at Granite Mtn., explosion breccias, and dikes and sills (principally trachyte,tinguaite, phonolite, some ranging from syenite to diabase.) Basic to ultrabasic - Lamproite pipes (Murfreesboro, Pike County) and dikes and sills (principally lamprophyres of fourchite, ouachitite, and monchiquite)

Alkalic ring dike igneous complexes: Magnet Cove (Hot Spring County)-core of carbonatite-ijolite, inner ring of alkalic extrusives and outer ring of nepheline syenite; Potash Sulfur Springs (Garland County)-mafic alkalic rocks, carbonatite, nepheline syenite and syenite. Both intruded during Mesozoic time into Paleozoic shale, sandstone and novaculite.

Campanian - Cenomanian72.1 - 100.5 MaLate Cretaceous sedimentary


Austin, Eagle Ford, Woodbine, and Tuscaloosa Groups

References for regional geology:

Data provided by

Garrity, C.P., and Soller, D.R.,. Database of the Geologic Map of North America: adapted from the map by J.C. Reed, Jr. and others (2005). U.S. Geological Survey Data Series 424 .

USGS compilers. State geologic map data. State Maps.

Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d.

Localities in this Region


The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


- Gogineni, S.; Melton, C.; and Giardini. A. (1978): Some petrological aspects of the Prairie Creek diamond-bearing kimberlite diatreme, Arkansas (Contributions to Mineralogy and Petrology 66:252-262).

- Mitchell, Roger H. and Bergman, Steven C. (1991): Petrology of Lamproites (NY: Plenum Press).

- Grey, Ian E.; Velde, Danielle; Criddle, Alan J. (1998): Haggertyite, a new magnetoplumbite-type titanate mineral from the Prairie Creek (Arkansas) lamproite (American Mineralogist 83: 1323-1329).

- Mitchell, Roger H. and Chakhmouradian (1999):Sr-Bearing Perovskite and Loparite from Lamproite and Agpaitic Nepheline Syenite Pegmatites (Canadian Mineralogist 37:99-112).

- Velde, Danielle (2000): Mineralogy of mafic xenoliths and their reaction zones in the olivine lamproite from Prairie Creek Arkansas and the paragenesis of haggertyite, Ba [Fe6Ti5Mg]O19 (American Mineralogist 85: 420-429).

- Dunn, Dennis Patrick (2002): Xenolith mineralogy and geology of the Prairie Creek lamproite province, Arkansas (PhD dissertation, University of Texas, Austin)

- Howard, J. M. and Hanson, W. D. (2008): Geology of the Crater of Diamonds State Park and Vicinity, Pike County, Arkansas (Little Rock: Arkansas Geological Survey).

Smith, II, R. C. and Barnes, J. H. (2006), Blue Gray by Day and Pinkish Purple by Night: Pennsylvania's Pyrope Garnets, Pennsylvania Geology, v. 36, no. 4, p. 2-10. Also, the link below with analyses of five G5 and one G9 garnet from Crater of Diamonds, Arkansas.

External Links

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