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(Mn2+,Fe2+)3(PO4)2 · 3H2O
Colourless, pale pink or yellow, reddish brown to dark brown (altered); colourless, faintly tinted pink in transmitted light.
Vitreous, Resinous
Specific Gravity:
3 - 3.2
Crystal System:
For the type locality at Branchville, in the town of Redding, Fairfield Co., Connecticut, USA.
Phosphoferrite Group, Phosphoferrite-Reddingite Series.

Note: Some "reddingites" may in fact be correianevesite.

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Classification of ReddingiteHide

Approved, 'Grandfathered' (first described prior to 1959)

C : Phosphates without additional anions, with H2O
C : With only medium-sized cations, RO4:H2O = 1:1.5

3 : A3(XO4)2·xH2O

19 : Phosphates
12 : Phosphates of Mn

Physical Properties of ReddingiteHide

Vitreous, Resinous
Transparent, Translucent
Lustre extends to sub-resinous from vitreous.
Colourless, pale pink or yellow, reddish brown to dark brown (altered); colourless, faintly tinted pink in transmitted light.
3½ on Mohs scale
On {010}, poor
3 - 3.2 g/cm3 (Measured)    3.24 g/cm3 (Calculated)
Calculated value is for Mn:Fe = 3:1.

Optical Data of ReddingiteHide

Biaxial (+)
RI values:
nα = 1.643 - 1.658 nβ = 1.648 - 1.664 nγ = 1.674 - 1.685
Measured: 41° to 65°, Calculated: 48° to 58°
Max Birefringence:
δ = 0.031
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Buckfield, Maine material:

X = colourless
Y = Pinkish brown
Z = Pale yellow

Chemical Properties of ReddingiteHide

(Mn2+,Fe2+)3(PO4)2 · 3H2O
IMA Formula:
Mn2+3(PO4)2 · 3H2O
Common Impurities:

Crystallography of ReddingiteHide

Crystal System:
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Cell Parameters:
a = 9.49 Å, b = 10.08 Å, c = 8.7 Å
a:b:c = 0.941 : 1 : 0.863
Unit Cell V:
832.24 ų (Calculated from Unit Cell)
Crystals octahedral with large {111}, or tabular {010}. The crystals are frequently in parallel grouping. Massive, granular; coarsely fibrous.

Crystallographic forms of ReddingiteHide

Crystal Atlas:
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Reddingite no.1 - Goldschmidt (1913-1926)
Reddingite no.2 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by

Edge Lines | Miller Indicies | Axes

Opaque | Translucent | Transparent

Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation

Type Occurrence of ReddingiteHide

Other Language Names for ReddingiteHide


Relationship of Reddingite to other SpeciesHide

Other Members of this group:
CorreianevesiteFe2+Mn2+2(PO4)2 · 3H2OOrth. mmm (2/m 2/m 2/m)
Garyansellite(Mg,Fe)3(PO4)2(OH,O) · 1.5H2OOrth. mmm (2/m 2/m 2/m)
LandesiteMn2+3-xFe3+x(PO4)2(OH)x · (3-x)H2OOrth.
Phosphoferrite(Fe2+,Mn2+)3(PO4)2 · 3H2OOrth. mmm (2/m 2/m 2/m) : Pmna
Forms a series with:

Common AssociatesHide

Associated Minerals Based on Photo Data:
Hureaulite23 photos of Reddingite associated with Hureaulite on
Rockbridgeite10 photos of Reddingite associated with Rockbridgeite on
Vivianite5 photos of Reddingite associated with Vivianite on
Dickinsonite-(KMnNa)3 photos of Reddingite associated with Dickinsonite-(KMnNa) on
Fairfieldite2 photos of Reddingite associated with Fairfieldite on
Triphylite1 photo of Reddingite associated with Triphylite on
Rittmannite1 photo of Reddingite associated with Rittmannite on
Kryzhanovskite1 photo of Reddingite associated with Kryzhanovskite on

Related Minerals - Nickel-Strunz GroupingHide

8.CC.05Garyansellite(Mg,Fe)3(PO4)2(OH,O) · 1.5H2OOrth. mmm (2/m 2/m 2/m)
8.CC.05LandesiteMn2+3-xFe3+x(PO4)2(OH)x · (3-x)H2OOrth.
8.CC.05Phosphoferrite(Fe2+,Mn2+)3(PO4)2 · 3H2OOrth. mmm (2/m 2/m 2/m) : Pmna
8.CC.10KaatialaiteFe(H2AsO4)3 · 5H2OMon. 2/m
8.CC.15LeogangiteCu10(AsO4)4(SO4)(OH)6 · 8H2OMon. 2/m : B2/b

Related Minerals - Dana Grouping (8th Ed.)Hide,Mn2+)3(PO4)2 · 3H2OOrth. mmm (2/m 2/m 2/m) : Pmna,Mn2+)3(PO4)2(OH,H2O)3Orth. · (3-x)H2OOrth.,Fe)3(PO4)2(OH,O) · 1.5H2OOrth. mmm (2/m 2/m 2/m)

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

19.12.1MetaswitzeriteMn2+3(PO4)2 · 4H2OMon. 2/m : P2/b
19.12.2BermaniteMn2+Mn3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P2/b
19.12.3NatrophiliteNaMn2+PO4Orth. mmm (2/m 2/m 2/m) : Pmna
19.12.5Niahite(NH4)(Mn2+,Mg)(PO4) · H2OOrth. mm2 : Pmn21
19.12.6RobertsiteCa2Mn3+3(PO4)3O2 · 3H2OMon. m : Bb
19.12.7PararobertsiteCa2Mn3+3(PO4)3O2 · 3H2OMon. 2/m : P21/b
19.12.8SinkankasiteMn2+Al(PO3OH)2(OH) · 6H2OTric.
19.12.9MangangordoniteMn2+Al2(PO4)2(OH)2 · 8H2OTric.
19.12.10Heterosite(Fe3+,Mn3+)PO4Orth. mmm (2/m 2/m 2/m) : Pmna
19.12.11Purpurite(Mn3+,Fe3+)PO4Orth. mmm (2/m 2/m 2/m) : Pmna
19.12.12Wolfeite(Fe2+,Mn2+)2(PO4)(OH)Mon. 2/m : P21/b
19.12.13Triploidite(Mn2+,Fe2+)2(PO4)(OH)Mon. 2/m : P2/b
19.12.15FrondeliteMn2+Fe3+4(PO4)3(OH)5Orth. 2 2 2 : C2 2 21
19.12.16RockbridgeiteFe2+Fe3+4(PO4)3(OH)5Orth. mmm (2/m 2/m 2/m)
19.12.18LandesiteMn2+3-xFe3+x(PO4)2(OH)x · (3-x)H2OOrth.
19.12.19Phosphoferrite(Fe2+,Mn2+)3(PO4)2 · 3H2OOrth. mmm (2/m 2/m 2/m) : Pmna
19.12.21EarlshannoniteMn2+Fe3+2(PO4)2(OH)2 · 4H2OMon.
19.12.22Hureaulite(Mn,Fe)5(PO4)2(HPO4)2 · 4H2OMon. 2/m : B2/b
19.12.23Switzerite(Mn,Fe)3(PO4)2 · 7H2OMon.
19.12.24LaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
19.12.25PseudolaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OMon. 2/m : P21/b
19.12.26StrunziteMn2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1
19.12.27StewartiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
19.12.30Fillowite{Mn2+}{Na8}{Ca4Na4}{(Mn2+,Fe2+)43}(PO4)36Trig. 3 : R3
19.12.32WicksiteNaCa2(Fe2+,Mn2+)4MgFe3+(PO4)6 · 2H2OOrth. mmm (2/m 2/m 2/m)
19.12.33Dickinsonite-(KMnNa){KNa}{Mn2+◻}{Ca}{Na3}{Mn2+13}{Al}(PO4)12(OH)2Mon. 2/m : B2/b
19.12.34Sarcopside(Fe2+,Mn2+,Mg)3(PO4)2Mon. 2/m : P21/b
19.12.35Ludlamite(Fe,Mn,Mg)3(PO4)2 · 4H2OMon. 2/m : P21/b
19.12.36GraftoniteFe2+Fe2+2(PO4)2Mon. 2/m : P21/b
19.12.37WilhelmvierlingiteCaMnFe3+(PO4)2(OH) · 2H2OOrth.
19.12.38FairfielditeCa2(Mn2+,Fe2+)(PO4)2 · 2H2OTric. 1 : P1
19.12.39BeusiteMn2+Mn2+2 (PO4)2Mon.
19.12.40MesseliteCa2(Fe2+,Mn2+)(PO4)2 · 2H2OTric. 1 : P1
19.12.41Jahnsite-(CaMnFe){Ca}{Mn2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
19.12.42Jahnsite-(CaMnMn){Ca}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
19.12.43Jahnsite-(CaMnMg){Ca}{Mn2+}{(Mg,Fe2+)2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
19.12.44KeckiteCaMn2+Fe3+2Fe3+2(PO4)4(OH)3(H2O)7Mon. 2/m : P2/b
19.12.47ZodaciteCa4Mn2+Fe3+4(PO4)6(OH)4 · 12H2OMon.
19.12.48HagendorfiteNaCaMn2+Fe2+2(PO4)3Mon. 2/m : B2/b
19.12.50VaruliteNaCaMn2+Mn2+2(PO4)3Mon. 2/m : B2/b
19.12.51GriphiteNa4Li2Ca6(Mn2+,Fe2+,Mg)19Al8(PO4)24(F,OH)8Iso. m3 (2/m 3)
19.12.52Attakolite(Ca,Sr)Mn(Al,Fe)4(HPO4,PO4)3(SiO4,PO4)(OH)4Mon. 2/m : B2/m
19.12.54Lun'okite(Mn,Ca)(Mg,Fe,Mn)Al(PO4)2OH · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
19.12.55EosphoriteMn2+Al(PO4)(OH)2 · H2OOrth. mmm (2/m 2/m 2/m) : Cmca
19.12.56Ernstite(Mn2+,Fe3+)Al(PO4)(OH,O)2 · H2OMon.
19.12.57ChildreniteFe2+Al(PO4)(OH)2 · H2OOrth. mm2 : Ccc2
19.12.58BobfergusoniteNa2Mn5FeAl(PO4)6Mon. 2/m : P2/b
19.12.59QingheiiteNaMn3+Mg(Al,Fe3+)(PO4)3Mon. 2/m : P21/b
19.12.60Whiteite-(CaFeMg){Ca}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m : P21/b
19.12.61Whiteite-(CaMnMg){Ca}{Mn2+}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m
19.12.62Whiteite-(MnFeMg){(Mn2+,Ca)}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m : P21/b
19.12.63Rittmannite{(Mn2+,Ca)}{Mn2+}{(Fe2+,Mn2+,Mg)2}{(Al,Fe3+)2}(PO4)4(OH)2 · 8H2OMon.
19.12.64ZanazziiteCa2Mg5Be4(PO4)6(OH)4 · 6H2OMon. 2/m : B2/b
19.12.65Samuelsonite(Ca,Ba)Ca8Fe2+2Mn2+2Al2(PO4)10(OH)2Mon. 2/m : B2/m

Other InformationHide

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

References for ReddingiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Brush and Dana (1878) American Journal of Science: 16: 120.
Brush and Dana (1879) American Journal of Science: 17: 365.
Brush and Dana (1890) American Journal of Science: 39: 211.
Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 126.
Landes (1925) American Mineralogist: 10: 387.
Berman and Gonyer (1930) American Mineralogist: 15: 379.
Wolfe (1940) American Mineralogist: 25: 752.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp. 727-729.
Inorganic Chemistry: 15: 316-321.
Mineralogical Magazine (1980): 43: 789.
Ray L. Frost, Yunfei Xi, Ricardo Scholz, Fernanda M. Belotti, Leonardo E. Lagoeiro (2012): Chemistry, Raman and infrared spectroscopic characterization of the phosphate mineral reddingite: (MnFe)3(PO4)2(H2O,OH)3, a mineral found in lithium-bearing pegmatite. Physics and Chemistry of Minerals 39, 803-810.

Internet Links for ReddingiteHide

Localities for ReddingiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • San Luis
    • Coronel Pringles Department
      • Totoral pegmatitic field
OYARZABAL, J. and GALLISKI, M.A.. Hureaulite, Mn+25(H2O)4[PO3(OH)]2[PO4]2, from different deposits of the Totoral pegmatitic field, San Luis. Rev. Asoc. Geol. Argent. [online]. 2007, vol.62, n.2, pp. 210-216.
  • Minas Gerais
    • Água Boa
Peter Kohorst collection
    • Conselheiro Pena
Ray L. Frost, Yunfei Xi, Ricardo Scholz, Fernanda M. Belotti, Leonardo E. Lagoeiro (2012): Chemistry, Raman and infrared spectroscopic characterization of the phosphate mineral reddingite: (MnFe)3(PO4)2(H2O,OH)3, a mineral found in lithium-bearing pegmatite. Physics and Chemistry of Minerals 39, 803-810.; Jordi Fabre
    • Divino das Laranjeiras
Mike Scott S104310 from Cureton #HC from Carlos Barbosa
    • Galiléia
      • Sapucaia do Norte
AmMin 89:1087
  • Guizhou Province
    • Tongren Prefecture
      • Songtao Co.
        • Songtao Mn ore field
Qi Zhou, Yuansheng Du, and Ying Qin (2013): Mineral Deposits 32(3), 457-466
  • Western and Inner Finland Region
    • Orivesi
      • Eräjärvi area
Sandström, F. & Lahti, S.I. (2009): Viitaniemipegmatiten i Eräjärvi, Orivesi, Finland. Litiofilen 26 (1): 11-38
  • Bavaria
    • Upper Palatinate
      • Plößberg
Weiss: "Mineralfundstellen, Deutschland West", 1990
      • Waidhaus
        • Hagendorf
Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
  • Honshu Island
    • Kanto Region
      • Ibaraki Prefecture
        • Kasumigaura City
          • Chiyoda-machi
Matsubara & Kato (1980) Koubutsugaku Zasshi, 14, 269-286.
  • Guarda District
    • Sabugal
      • Bendada
Schnorrer-Köhler (1991), Mineral Occurrences.
Pedro Alves collection
  • Viana do Castelo District
    • Ponte da Barca
      • São Lourenço de Touvedo
Leal Gomes, C., Azevedo, A., Lopes Nunes, J., & Dias, P. A. (2009). Phosphate fractionation in pegmatites of Pedra da Moura II claim–Ponte da Barca–Portugal. Estudos Geológicos, 19(2), 172.
    • Viana do Castelo
BELLO, A. d'O. (1909-1913) Mineraux portugais. Bull. Soc. Portugaise Sci. Nat., 2, 272-280; 4, 68-78; 6, 90-103; Mineral samples in the Collection of the IST (Instituto Superior Técnico); Pedro Alves, collection and in situ observations.
  • Viseu District
    • Mangualde
Angel Roldán Herrero collection
Mineralien Atlas
  • Connecticut
    • Fairfield Co.
      • Redding (Reading)
        • Branchville
Brush and Dana (1878); Shainin (1946): American Mineralogist 31: 329-345; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 702, 729.; Rocks & Minerals (1995) 70:396-409
    • Middlesex Co.
      • Portland
        • Collins Hill
          • Strickland pegmatite (Strickland-Cramer Quarry; Strickland-Cramer Mine; Strickland-Cramer Feldspar-Mica Quarries)
Schooner, Richard. (circa 1985), Untitled manuscript on central Connecticut mineralogy.
  • Maine
    • Androscoggin Co.
      • Poland
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. Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 721, 729.
    • Oxford Co.
      • Buckfield
Landes (1925) Paragenesis of the Granite Pegmatites of Central Maine, American Mineralogist.
      • Greenwood
        • Uncle Tom Mountain
No reference listed
      • Newry
King, V. and Foord, E., 1994, Mineralogy of Maine, V. 1; King, V. (ed), 2000, Mineralogy of Maine, V. 2.
      • Rumford
King, V.T., 1994, Mineralogy of Maine, Descriptive Mineralogy, v.1.
  • New Hampshire
    • Grafton Co.
      • Grafton
Morrill, P, 1960, New Hampshire Mines and Mineral Localities.; Rocks & Minerals (2005) 80:242-261 New Hampshire Mineral Locality Index
      • Groton
Morrill, 1960. NH Mines and Minerals Localities, 2nd ed.
    • Strafford Co.
      • Strafford
        • Parker Mountain
Rocks & Min. 80:256 (2005); Rocks & Minerals 80:4 pp234-241
  • South Dakota
    • Custer Co.
      • Custer District
        • Custer
Januzzi, R.E. and Seaman, David M. (1976) Mineral Localities Of Connecticut and Southern New York State and Pegmatite Minerals of the World.
    • Pennington Co.
      • Keystone District
        • Glendale
Rocks & Minerals: 75(3): 156-169.
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