Mindat Logo

Magnet Cove, Hot Spring Co., Arkansas, USA
This page is currently not sponsored. Click here to sponsor this page.

Latitude: 34°27'14"N
Longitude: 92°50'38"W
 
 
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
Malachite
Marcasite
Melanterite
'Melilite'
'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


262 entries listed. 143 valid minerals. 5 type localities (valid minerals).

Localities in this Region

USA
USA

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 Geol. Survey Ann. Rept., 1890, v. 2, 457 p.

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.

Rocks and Minerals (1999): 74: 189.

Rocks and Minerals (2001): 76: 257.

External Links


Mineral and/or Locality  
Search Google  
Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
Current server date and time: September 21, 2014 14:08:35 Page generated: September 18, 2014 02:19:36
Mineral and Locality Search
Mineral:
and/or Locality:
Options
Fade toolbar when not in focusFix toolbar to bottom of page
Hide Social Media Links
Slideshow frame delay seconds