Magnet
Cove
Magnet Cove is a
ring-dike intrusion of alkaline rocks about 20 km E of Hot Springs,
Arkansas. A ring of nepheline-syenite encloses a weathered dark
ijolite (which is a relative of nepheline syenite, silica-poor and
mafic-rich) and some carbonatites. During the early late Cretaceous
(95 mio years ago) the complex intruded into sedimentary rocks.
The locality is known
for a unique mineralogy especially rich in titanium minerals.
Specimens came mainly from the Diamond Jo Quarry and otherwise from
small exploration and mining operations, carbonatite quarrying,
construction, road and pipeline building and from occasional specimen
digging. There are several types of miarolitic cavities and
alteration zones in the adjactent contact rocks yielding the
minerals.
Mineral list:
(bold = type locality)
- Aegirine
- Albite
- Allophane
- Analcime
- Anatase
- Andesine
- Andradite
- Anhydrite
- Ankerite
- Anorthoclase
- Aragonite
- Arfvedsonite
- Astrophyllite
- Augite
- Baddeleyite
- Barite
- Barytocalcite
- Bastnaesite-(Ce)
- Beidellite
- Benitoite
- Biotite
- Britholite-(Ce)
- Brookite
- Brucite
- Cacoxenite
- Calcite
- Cancrinite
- Carbonate-fluorapatite
- Catapleiite
- Chabazite
- Churchite-(Y)
- Delindeite
- Dolomite
- Elpidite
- Epidote
- Eudialyte
- Ferrohornblende
- Fluorapatite
- Fluorapophyllite
- Fluorite
- Galena
- Goethite
- Gonnardite
- Gypsum
- Hercynite
- Heulandite
- Hornblende
- Ilmenite
- Kaolinite
- Kassite
- Kimzeyite
- Kolbeckite
- Kupletskite
- Labradorite
- Labuntsovite
- Lenoblite
- Lorenzenite
- Lourenwalsite
- Magnetite
- Marcasite
- Microcline
- Molybdenite
- Monazite-(Ce)
- Monticellite
- Narsarsukite
- Natrolite
- Nepheline
- Nontronite
- Oligoclase
- Opal
- Orthoclase
- Paramontroseite
- Pectolite
- Perovskite
- Phlogopite
- Pyrite
- Pyrophanite
- Quartz
- Rutile
- Schorlomite
- Siderite
- Siderophyllite
- Sodalite
- Sphalerite
- Spinel
- Synchysite-(Ce)
- Taeniolite
- Thomsonite
- Titanite
- Tobermorite
- Tremolite
- Vermiculite
- Vesuvianite
- Wavellite
- Wollastonite
- Zircon
&Suggested
reading:
Smith, A.E.Jr.:
Minerals from the miarolitic cavities at the Diamond Jo Quarry,
Magnet Cove, Hot Spring County, Arkansas. Rocks&Minerals,
64(1989), pp.300-307
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