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Jahnsite Group

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

Show Jahnsite Group Photos (46)





Group of complex monoclinic phosphates.
See also the closely related Whiteite Group.

Classification of Jahnsite Group

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Relationship of Jahnsite Group to other Species

Group Members:
Jahnsite-(CaFeFe)
{Ca}{Fe
2+
 
}{Fe
2+
2
}{Fe
3+
2
}(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
Jahnsite-(CaMnFe)
{Ca}{Mn
2+
 
}{Fe
2+
2
}{Fe
3+
2
}(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
Jahnsite-(CaMnMg)
{Ca}{Mn
2+
 
}{(Mg,Fe
2+
 
)
 
2
}{Fe
3+
2
}(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
Jahnsite-(CaMnMn)
{Ca}{Mn
2+
 
}{Mn
2+
2
}{Fe
3+
2
}(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
Jahnsite-(MnMnMn)
{Mn
2+
 
}{Mn
2+
 
}{Mn
2+
2
}{Fe
3+
2
}(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
Jahnsite-(NaFeMg)
NaFe
3+
 
Mg
 
2
Fe
3+
2
(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
Jahnsite-(NaMnMg)
{Na}{Mn
3+
 
}{Mg
 
2
}{Fe
3+
2
}(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
Keckite
CaMn
2+
 
Fe
3+
2
Fe
3+
2
(PO
 
4
)
 
4
(OH)
 
3
(H
 
2
O)
 
7

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for Jahnsite Group

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    • Localities for Jahnsite Group

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Australia
     
    • South Australia
      • Eyre Peninsula
        • Middleback Range
          • Iron Knob
    		[Jahnsite-(CaMnMn)] Australian Jour.Min. v.6, no. 1
    • Victoria
      • East Gippsland Shire
        • Omeo
          • Mt Wills Mining District
            • Glen Wills
    		[Keckite] Dr. Bill Birch - Museum Victoria
    Austria
     
    • Carinthia
      • Koralpe
        • Moschkogel - Weinebene area
          • Brandrücken
    		[Jahnsite-(CaMnMg)] J. Taucher, B. Moser, W. Postl, F. Brandstätter: Carinthia II 182./102.:115-124 (1992)
    Brazil
     
    • Minas Gerais
      • Doce valley
        • Galiléia
          • Sapucaia do Norte
    		[Jahnsite-(CaMnFe)] Cassedanne, J.P. & Baptista, A. (1999): Famous Mineral Localities: The Sapucaia Pegmatite Minas Gerais, Brazil. Mineralogical Record, 30: 347-360 + 365
      • Jequitinhonha valley
        • Itinga
    		[Jahnsite-(CaMnMg)] Van King
    Democratic Republic of Congo (Zaïre)
     
    • Sud-Kivu
      • Lusungu River District
    		[Keckite] Mills, S. J., Birch, W. D., Kampf, A. R. & van Wambeke, L. (2010) Kobokoboite, Al6(PO4)4(OH)6•11H2O, a new mineral from the Kobokobo pegmatite, Democratic Republic of the Congo. European Journal of Mineralogy, 22(2)
    Finland
     
    • Western and Inner Finland Region
      • Orivesi
        • Eräjärvi area
    		[Jahnsite-(CaMnFe)] Sandström, F. & Lahti, S.I. (2009): Viitaniemipegmatiten i Eräjärvi, Orivesi, Finland. Litiofilen 26 (1): 11-38
    Germany
     
    • Bavaria
      • Lower Bavaria
        • Bavarian Forest
          • Zwiesel
            • Rabenstein
    		[Keckite] Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
      • Upper Palatinate
        • Oberpfälzer Wald
          • Vohenstrauß
            • Waidhaus
              • Hagendorf
    		[Jahnsite-(CaMnFe)] Christian Rewitzer collection (analysed by EPMA and Moessbauer spectroscopy).
    [Keckite] Wittern: "Mineralfundorte in Deutschland", 2001
    Italy
     
    • Lombardy
      • Lecco Province
        • Colico
    		[Jahnsite-(CaMnFe)] Vignola, P., Fransolet, A.M., Guastoni, A. & Appiani, R. (2011). Le pegmatiti di Piona. Recenti studi sui filoni Malpensata, Luna e Sommafiume. Rivista Mineralogica Italiana, 1/2011, 30-38
        • Vestreno
    		[Jahnsite-(CaMnFe)] Vignola et al. (2011): Complex mechanisms of alteration in a graftonite + sacropside+ triphylite association from the Luna pegmatite, Piona, Lecco Province, Italy. Canadian Mineralogist. 49, 765-776.
    Japan
     
    • Honshu Island
      • Kinki region
        • Hyogo prefecture
          • Kobe city
    		[Jahnsite-(CaFeFe)] Ganko-Gakkai Koen-Yoshi (Abstracts of the Meetings of Japanese Association of Mineralogists...) (in japanese) 40 (1995)
    Portugal
     
    • Guarda District
      • Gouveia
        • Folgosinho
    		[Keckite]
      • Sabugal
    		[Jahnsite-(CaMnMn)] Sopas de Pedra, A. M. Galopim de Carvalho, Gradiva, Lisbon, Portugal
    • Viana do Castelo District
      • Ponte da Barca
        • Touvedo
    		[Keckite] self-find by Nuno Afonso, optical and XRD analysed.
    • Viseu District
      • Mangualde
    		[Jahnsite-(CaMnMn)] Am. Min.(1990), 75, 404-409
    sergio varvello
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
    		[Jahnsite-(CaMnFe)]
    Switzerland
     
    • Ticino (Tessin)
      • Lago Maggiore
        • Brissago
    		[Jahnsite-(CaMnFe)] Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 226.
    USA
     
    • California
      • San Diego Co.
        • Pala District
          • Pala
            • Tourmaline Queen Mountain (Pala Mtn; Queen Mtn)
    		[Jahnsite-(MnMnMn)] Min Mag 42 (1978), 309
    • Maine
      • Cumberland Co.
        • Baldwin
    		[Jahnsite-(CaMnMn)] No reference listed
      • Oxford Co.
        • Greenwood
          • Uncle Tom Mountain
    		[Jahnsite-(MnMnMn)] Thompson, W, Joyner, D., Woodman, R., and King, V., 1998. Maine Mineral Localities, 3rd ed.; King and Foord, 1994, Mineralogy of Maine
        • Newry
    		[Jahnsite-(CaMnFe)] King, V. and Foord, E., 1994, Mineralogy of Maine, V. 1; King, V. (ed.), 2000, Mineralogy of Maine, V. 2.
    [Jahnsite-(CaMnFe)] King, V. and Foord, E., 1994, Mineralogy of Maine, V. 1; King, V. (ed), 2000, Mineralogy of Maine, V. 2.
        • Paris
    		[Jahnsite-(CaMnMn)] King, V. T. and Foord, E. E., 1994, Mineralogy of Maine, Descriptive Mineralogy, volume 1, Maine Geological Survey, Augusta, Maine, USA, pp. 418 + 88 plates. "Maine Mineral Localites, 3rd Ed." by Thompson, W.B., et.al. , 1998; Mineralogical Record 22:382
    [Jahnsite-(CaMnFe)]
        • Rumford
    		[Jahnsite-(CaMnFe)] King & Foord, 1994. Mineralogy of Maine, Vol.1, p.264.
    • Nevada
      • Eureka Co.
        • Lynn District
    		[Jahnsite-(CaMnMg)] NBMG Spec. Pub. 31 Minerals of Nevada
    • New Hampshire
      • Grafton Co.
        • Groton
    		[Jahnsite-(CaMnFe)] Moore and Ito (1978), Mineralogical Magazine: 42: 309-323 [316].
    [Jahnsite-(CaMnFe)] NIZAMOFF, James W., SIMMONS, William B., and FALSTER, Alexander U. (2004) PHOSPHATE MINERALOGY AND PARAGENESIS OF THE PALERMO #2 PEGMATITE, NORTH GROTON, NEW HAMPSHIRE Geological Society of America Abstracts with Programs, Vol. 36, No. 5, p. 115
    [Jahnsite-(CaMnFe)] Journal of Pegmatology vol. 1, no. 1
    • North Carolina
      • Cleveland Co.
        • Kings Mountain District
    		[Jahnsite-(CaMnFe)]
    • South Dakota
      • Custer Co.
        • Custer District
          • Custer
    		[Jahnsite-(CaMnMn)] Tony Nikischer;
          • Fourmile
    		[Jahnsite-(CaMnFe)] Thomas A. Loomis & Thomas J. Campbell (2002) The Tip Top pegmatite A Historical Review and Mineralogical Update MATRIX Vol. 10, No. 3
      • Pennington Co.
        • Keystone District
          • Keystone
    		[Jahnsite-(CaMnMg)] Rocks & Minerals: 67(6): 380-388.
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    Copyright © Jolyon Ralph and Ida Chau 1993-2012. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the 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 hundreds 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.
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