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Magnet Cove, Hot Spring Co., Arkansas, USA

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Latitude & Longitude (WGS84): 34° 27' 14'' North , 92° 50' 38'' West
Latitude & Longitude (decimal): 34.4538888889, -92.8438888889


The ring dike igneous complex has a core of ijolite and carbonatite, an intermediate ring of trachyte and phonolite, an outer ring of nepheline syenites, and two masses of jacupirangite, one on the west edge of the complex and the other on the northeast edge. Smaller dikes of tinguaite, trachyte porphyry, nepheline syenite, miscellaneous trachytes, pegmatite, aplite, gabbro, fourchite, and carbonatite, and a variety of veins are widespread. Mineralogically, the igneous rocks of the complex can be divided into two groups, those rocks containing feldspar and those virtually free of feldspar. The igneous rocks containing feldspar include: phonolite, various trachytes, tinguaite, various syenites (some pegmatitic), alkalic gabbro, and aplites. The igneous rocks that are generally free of feldspar include: jacupirangite, sphene pyroxenite, ijolite, melteigite, fourchite, and carbonatite.

The carbonatite occurs in irregularly shaped bodies in the central part of the complex. Aggregates of apatite, magnetite, pyrite, monticellite, perovskite, and kimzeyite (zirconium garnet) are scattered through a groundmass of coarse calcite. Part of the carbonatite has weathered to porous rock composed of residual apatite, magnetite, and perovskite in a matrix of secondary apatite. In contact with the ijolite, the carbonatite fluids were reactive and altered the minerals of the ijolite.

Dikes outside the complex are grouped in the following categories: pegmatite, aplite, syenite, trachyte porphyry, trachyte, tinguaite, andesite, diorite, monzonite, and lamprophyre.

Veins of various types are found both within and outside the complex: quartz-brookite-rutile veins, most common in the recrystallized novaculite on the east edge of the complex; feldspar-carbonate veins, most common in the northern two-thirds of the complex; and feldspar, quartz-feldspar, and fluorite veins. Late quartz veins are associated with the carbonatite. Molybdenite and apatite veins are found in the carbonatite and ijolite. Earthy monazite, apparently a weathering product of an apatitepyrite vein, was found in the central part of the complex. Paramorphs of rutile after brookite are found as float throughout the complex but are most abundant in the northern two-thirds of the complex. USGS PP 425
Geologic Map USGS PP425

Mindat Articles

Analysis of Arkansas Syenite Minerals - Part 2 by Henry Barwood


Mineral List

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

Actinolite

Aegirine

Albite

var: Andesine

var: Oligoclase

'Albite-Anorthite Series'

Allanite-(Ce)

Allanite-(La)

Allophane

'Amphibole Supergroup'

Analcime

Anatase

'Ancylite'

Ancylite-(Ce)

Andradite

var: Melanite

Anhydrite

Ankerite

Anorthite

var: Labradorite

'Anorthoclase'

'Apatite'

'var: Carbonate-rich Apatite'

'Apophyllite'

Aragonite

Arfvedsonite

Arsenopyrite

Astrophyllite

Augite

var: Titanian Augite

Baddeleyite

Baryte

Barytocalcite

Barytolamprophyllite

Bastnäsite-(Ce)

Bastnäsite-(La)

Beidellite

Benitoite

Benstonite (TL)

'Biotite'

Britholite-(Ce)

'Britholite Group'

Brookite

Brucite

Burbankite

Cacoxenite

Calcite

Cancrinite

Catapleiite

Celestine

'Chabazite'

Chabazite-Ca

Chalcopyrite

Chamosite

'Chert
var: Novaculite'

'Chlorite Group'

Churchite-(Y)

'Clinopyroxene Subgroup'

Crandallite

Delindeite (TL)

Dickite

Diopside

Dolomite

Elpidite

Epidote

Eudialyte

'Eudialyte Group'

'var: Eucolite'

'Feldspar Group'

Felsőbányaite

Ferberite

Ferrimolybdite

Ferro-hornblende

Fluorapatite

var: Carbonate-rich Fluorapatite

Fluorapophyllite-(K)

Fluorite

Gaidonnayite

Galena

'Garnet'

Goethite

Gonnardite

Grossular

Gypsum

Hedenbergite

Hematite

Hercynite

'Heulandite'

'Hornblende'

Ilmenite

Jarosite

Joaquinite-(Ce)

'Joaquinite Group'

Johannsenite

Kaolinite

Kassite

Kimzeyite (TL)

Kolbeckite

Kupletskite

Labuntsovite-Fe

Labuntsovite-Mn

'Labuntsovite Supergroup'

Låvenite

Lenoblite

Leucite

Leucosphenite

Leucoxene

'Limonite'

Loparite-(Ce)

Lorenzenite

Lourenswalsite (TL)

Magnesio-arfvedsonite

Magnetite

var: Aluminous Magnetite

Malachite

Marcasite

Melanterite

'Melilite Group'

'Mica Group'

Microcline

Molybdenite

Monazite-(Ce)

Monticellite

Mordenite

Muscovite

Narsarsukite

Natrolite

Nenadkevichite

Nepheline

Nontronite

Nosean

'Olivine'

Opal

Orthoclase

Paramontroseite

Paraumbite

Pectolite

var: Manganoan Pectolite

Perovskite

var: Dysanalyte

Petedunnite

Phlogopite

Polylithionite

'Pseudoleucite'

Pyrite

Pyrochlore Group

Pyrophanite

'Pyroxene Group'

Pyrrhotite

Quartz

var: Smoky Quartz

Rhabdophane-(Ce)

Rhodochrosite

Riebeckite

Rutile

var: Ilmenorutile

var: Strüverite

Sanidine

Schorlomite (TL)

Seidite-(Ce)

Siderite

Siderophyllite

'Smectite Group'

Sodalite

var: Hackmanite

'Sodalite Group'

Sphalerite

Spinel

Strontianite

'Synchysite'

Synchysite-(Ce)

'Synchysite Group'

Tainiolite

Talc

Tetraferriannite

Thaumasite

'Thomsonite'

Thomsonite-Ca

Titanite

Tobermorite

Tremolite

'Uvite'

Vermiculite

Vesuvianite

Wavellite

Wollastonite

Yofortierite

'Zeolite Group'

Zircon

Zircophyllite


143 valid minerals. 5 (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 mindat.org 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


Localities in this Region


The above list contains all mineral locality references listed on mindat.org. 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 mindat.org 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.

References

Macrery, J. (1806), A description of the Hot Springs and volcanic appearance in the country adjoining the river Ouachita in Louisiana: New York Medical Depository, v. 3, p. 47-50 (communicated in a letter to Dr. Miller, according to Williams (1891)).

Williams, J. F., (1891) The igneous rocks of Arkansas: Arkansas Geological Survey Annual Report (1890): volume 2, 457 pp.

American Mineralogist (1929): 14: 484-487.

Landes, K.K. (1931), A paragenetic classification of the Magnet Cove minerals. American Mineralogist (16), 313-326.

American Mineralogist (1941): 26: 437.

Erickson, Ralph Leroy; Blade, Lawrence Vernon (1963) Geochemistry and petrology of the alkalic igneous complex at Magnet Cove, Arkansas. USGS Professional Paper 425

Rocks and Minerals (1976): 51: 495-507.

American Mineralogist (1992): 77: 685-703.

Economic Geology (1994): 89(1) (February): 105-130.

Rocks and Minerals (1999): 74: 189.

Rocks and Minerals (2001): 76: 257.

External Links


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