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Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA

Montgomeryite
Tip Top Mine, Fourmile, Custer District, Custer Co., South Dakota, USA

Photo: JBS 2006
Latitude: 43°42'56"N
Longitude: 103°40'10"W
An open-cast Be mine located just SW of the center of Sec. 8, T3S, R4E, about 8.5 km SW of Custer.

Mineralization is in the primary and secondary phosphate-bearing Tip Top granite pegmatite body. Note that many early reported phosphate species from this locality have been re-identified, particularly regarding manganese, iron, or magnesium end-members. Old references may be at variance with modern nomenclature. Both Campbell, T.J. and Roberts, W.L. (1986). Phosphate minerals from the Tip Top mine, Black Hills, South Dakota. Mineralogical Record. 17: 237-254. and Thomas A. Loomis & Thomas J. Campbell (2002) The Tip Top pegmatite A Historical Review and Mineralogical Update MATRIX: 10(3): 138-146 are definitive statements as to species identification.

Mineral List

Albite
Alluaudite
Almandine
Amblygonite
Arseniosiderite
Arsenopyrite
Autunite
Barbosalite
Beraunite
Bermanite
Beryl
'Biotite'
Bismuth
Bobdownsite
Cassiterite
Childrenite
Collinsite
'Columbite-Tantalite'
Crandallite
Cyrilovite
Diadochite
Dufrénite
Ehrleite (TL)
Elbaite
Englishite
Eosphorite
Fairfieldite
Ferrisicklerite
Fluorapatite
Fransoletite (TL)
Frondelite
Galena
Goethite
Gordonite
Goyazite
Greifensteinite
Heterosite
Hopeite
Hureaulite
Hurlbutite
Hydroxylapatite
var: Carbonate-rich Hydroxylapatite
Hydroxylherderite
'Jahnsite'
'Jahnsite-(CaMgMg)'
Jahnsite-(CaMnFe) ?
Jahnsite-(CaMnMg) (TL)
Jahnsite-(NaFeMg) (TL)
'Jahnsite-(NaMnMg)'
Kidwellite
Kingsmountite
Kryzhanovskite
Laueite
Leucophosphite
Lithiophilite
Lithiophosphate
Ludlamite
Marcasite
Messelite
Meta-autunite
Metaswitzerite
Microcline
Mitridatite
'Monazite'
Montebrasite
Montgomeryite
Muscovite
Pahasapaite (TL)
Parafransoletite (TL)
Pararobertsite (TL)
Parascholzite
Perloffite
'Perthite'
Pharmacosiderite
Phosphoferrite
Purpurite
Pyrite
Pyrolusite
Quartz
Robertsite (TL)
Rockbridgeite
Roscherite
Scholzite
Schorl
Scorodite
Segelerite (TL)
Sicklerite
Siderite
Spessartine
Sphalerite
Stewartite
Strengite
Strunzite
Switzerite
Tavorite
Tinsleyite (TL)
Tiptopite (TL)
Todorokite
Triphylite
Triploidite
Uraninite
Ushkovite
Vivianite
Wardite
Whiteite-(CaMnMg) (TL)
Whitlockite
Whitmoreite
Xanthoxenite
Zircon


109 entries listed. 97 valid minerals. 12 type localities (valid minerals). 4 erroneous literature entries.

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References

Dunn, P.J., Roberts, W.L., Campbell, T.J. & Leavens, P.B. (1983): Red Montgomeryite and associated minerals from the Tip Top Pegmatite with notes on kingsmoutite and calcioferrite. Mineralogical Record 14 (3): 195-197.

Rocks & Minerals (1985): 60: 117.

Campbell, T.J. and Roberts, W.L. (1986). Phosphate minerals from the Tip Top mine, Black Hills, South Dakota. Mineralogical Record: 17: 237-254.

Moore, P. B. (2000), Analyses of Primary Phosphates from Pegmatites in Maine and Other Localities, in V. T. King (editor), Mineralogy of Maine. Mining History, Gems, and Geology, Maine Geological Survey, Augusta, Maine: 333-336.

Loomis, Thomas A. & Thomas J. Campbell (2002), The Tip Top pegmatite, A Historical Review and Mineralogical Update MATRIX: 10(3): 138-146.

Tait, K.T., Barkley, M.C., Thompson, R.M., Origlieri, M.J., Evans, S.H., Prewitt, C.T. & Yang, H. (2011), Bobdownsite, a new mineral species from Big Fish River, Yukon, Canada, and its structural relationship with whitlockite-type compounds. Canadian Mineralogist: 49: 1065-1078.

External Links

www.dakotamatrix.com/Articles/Tiptop.htm


This page kindly sponsored by Knut Eldjarn

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