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Reddingite

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Formula:
(Mn
2+
 
,Fe
2+
 
)
 
3
(PO
 
4
)
 
2
· 3H
 
2
O
System:OrthorhombicColour:Colourless, pale pink or ...
Hardness:
Member of:Phosphoferrite Group
Name: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.

Classification of Reddingite

IMA status:Approved
Strunz 8th edition ID:7/C.08-20
Nickel-Strunz 10th (pending) edition ID:8.CC.05

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
C : With only medium-sized cations, RO4:H2O = 1:1.5
Dana 8th edition ID:40.3.2.3

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
3 : A3(XO4)2·xH2O
Hey's CIM Ref.:19.12.20

19 : Phosphates
12 : Phosphates of Mn
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Type Occurrence of Reddingite

Type Locality:Fillow Quarry (Branchville Quarry; Branchville Mica Mine; Smith Mine), Branchville, Ridgefield, Fairfield Co., Connecticut, USA
Year of Discovery:1878

Physical Properties of Reddingite

Lustre:Vitreous, Resinous
Diaphaneity (Transparency):Transparent, Translucent
Comment:Lustre extends to sub-resinous from vitreous.
Colour:Colourless, pale pink or yellow, reddish brown to dark brown (altered); colourless, faintly tinted pink in transmitted light.
Hardness (Mohs):
Tenacity:Brittle
Cleavage:Poor/Indistinct
On {010}, poor
Fracture:Irregular/Uneven
Density (measured):3 - 3.2 g/cm3
Density (calculated):3.24 g/cm3
Comment:Calculated value is for Mn:Fe = 3:1.

Crystallography of Reddingite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pmna
Cell Parameters:a = 9.49Å, b = 10.08Å, c = 8.7Å
Ratio:a:b:c = 0.941 : 1 : 0.863
Unit Cell Volume:V 832.24 ų (Calculated from Unit Cell)
Morphology:Crystals octahedral with large {111}, or tabular {010}. The crystals are frequently in parallel grouping. Massive, granular; coarsely fibrous.
Crystal Atlas:
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Reddingite no.1 - Goldschmidt (1913-1926)
Reddingite no.2 - Goldschmidt (1913-1926)

About Crystal Atlas

The mindat.org Crystal Atlas allows you to view a selection of crystal drawings of real and idealised crystal forms for this mineral and, in certain cases, 3d rotating crystal objects. The 3d models and HTML5 code are kindly provided by www.smorf.nl.

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Transparency
Opaque | Translucent | Transparent

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Optical Data of Reddingite

Type:Biaxial (+)
RI values: nα = 1.643 - 1.658 nβ = 1.648 - 1.664 nγ = 1.674 - 1.685
2V:Measured: 41° to 65°, Calculated: 48° to 58°
Maximum Birefringence:δ = 0.031

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:strong
Pleochroism:Visible
Comments:Buckfield, Maine material:

X = colourless
Y = Pinkish brown
Z = Pale yellow

Chemical Properties of Reddingite

Formula:
(Mn
2+
 
,Fe
2+
 
)
 
3
(PO
 
4
)
 
2
· 3H
 
2
O
Simplified for copy/paste:(Mn2+,Fe2+)3(PO4)2·3H2O
Essential elements:H, Mn, O, P
All elements listed in formula:Fe, H, Mn, O, P
Common Impurities:Fe

Relationship of Reddingite to other Species

Series:Forms a series with Phosphoferrite (see here)
Member of:Phosphoferrite Group
Other Members of Group:

- +
Correianevesite
Fe
2+
 
Mn
2+
2
(PO
 
4
)
 
2
· 3H
 
2
O
Garyansellite
(Mg,Fe)
 
3
(PO
 
4
)
 
2
(OH,O) · 1.5H
 
2
O
Kryzhanovskite
(Fe
3+
 
,Mn
2+
 
)
 
3
(PO
 
4
)
 
2
(OH,H
 
2
O)
 
3
Landesite
Mn
2+
3-x
Fe
3+
x
(PO
 
4
)
 
2
(OH)
 
x
· (3-x)H
 
2
O
Phosphoferrite
(Fe
2+
 
,Mn
2+
 
)
 
3
(PO
 
4
)
 
2
· 3H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
8.CC.05Garyansellite
(Mg,Fe)
 
3
(PO
 
4
)
 
2
(OH,O) · 1.5H
 
2
O
8.CC.05Kryzhanovskite
(Fe
3+
 
,Mn
2+
 
)
 
3
(PO
 
4
)
 
2
(OH,H
 
2
O)
 
3
8.CC.05Landesite
Mn
2+
3-x
Fe
3+
x
(PO
 
4
)
 
2
(OH)
 
x
· (3-x)H
 
2
O
8.CC.05Phosphoferrite
(Fe
2+
 
,Mn
2+
 
)
 
3
(PO
 
4
)
 
2
· 3H
 
2
O
8.CC.10Kaatialaite
Fe(H
 
2
AsO
 
4
)
 
3
· 5H
 
2
O
8.CC.15Leogangite
Cu
 
10
(AsO
 
4
)
 
4
(SO
 
4
)(OH)
 
6
· 8H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
19.12.1Metaswitzerite
Mn
 
3
(PO
 
4
)
 
2
· 4H
 
2
O
19.12.2Bermanite
Mn
2+
 
Mn
3+
2
(PO
 
4
)
 
2
(OH)
 
2
· 4H
 
2
O
19.12.3Natrophilite
NaMn
2+
 
PO
 
4
19.12.4Sidorenkite
Na
 
3
Mn
2+
 
(CO
 
3
)(PO
 
4
)
19.12.5Niahite
(NH
 
4
)(Mn
2+
 
,Mg)(PO
 
4
) · H
 
2
O
19.12.6Robertsite
Ca
 
3
Mn
3+
4
(PO
 
4
)
 
3
O
 
2
· 3H
 
2
O
19.12.7Pararobertsite
Ca
 
2
Mn
3+
3
(PO
 
4
)
 
3
O
 
2
· 3H
 
2
O
19.12.8Sinkankasite
H
 
2
Mn
2+
 
Al(PO
 
4
)
 
2
(OH) · 6H
 
2
O
19.12.9Mangangordonite
Mn
2+
 
Al
 
2
(PO
 
4
)
 
2
(OH)
 
2
· 8H
 
2
O
19.12.10Heterosite
(Fe
3+
 
,Mn
3+
 
)PO
 
4
19.12.11Purpurite
(Mn
3+
 
,Fe
3+
 
)PO
 
4
19.12.12Wolfeite
(Fe
2+
 
,Mn
2+
 
)
 
2
(PO
 
4
)(OH)
19.12.13Triploidite
(Mn
2+
 
,Fe
2+
 
)
 
2
(PO
 
4
)(OH)
19.12.14Lipscombite
(Fe
2+
 
,Mn
2+
 
)Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
19.12.15Frondelite
Mn
2+
 
Fe
3+
4
(PO
 
4
)
 
3
(OH)
 
5
19.12.16Rockbridgeite
Fe
2+
 
Fe
3+
4
(PO
 
4
)
 
3
(OH)
 
5
19.12.17Kryzhanovskite
(Fe
3+
 
,Mn
2+
 
)
 
3
(PO
 
4
)
 
2
(OH,H
 
2
O)
 
3
19.12.18Landesite
Mn
2+
3-x
Fe
3+
x
(PO
 
4
)
 
2
(OH)
 
x
· (3-x)H
 
2
O
19.12.19Phosphoferrite
(Fe
2+
 
,Mn
2+
 
)
 
3
(PO
 
4
)
 
2
· 3H
 
2
O
19.12.21Earlshannonite
Mn
2+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
· 4H
 
2
O
19.12.22Hureaulite
(Mn,Fe)
 
5
(PO
 
4
)
 
2
(HPO
 
4
)
 
2
· 4H
 
2
O
19.12.23Switzerite
(Mn,Fe)
 
3
(PO
 
4
)
 
2
· 7H
 
2
O
19.12.24Laueite
Mn
2+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
· 8H
 
2
O
19.12.25Pseudolaueite
Mn
2+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
· 8H
 
2
O
19.12.26Strunzite
Mn
2+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
· 6H
 
2
O
19.12.27Stewartite
Mn
2+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
· 8H
 
2
O
19.12.28Alluaudite
(Na,Ca)Mn
2+
 
(Fe
3+
 
,Mn
2+
 
,Fe
2+
 
,Mg)
 
2
(PO
 
4
)
 
3
19.12.29Ferroalluaudite
(Na,Ca)Fe
2+
 
(Fe
3+
 
,Mn
2+
 
,Fe
2+
 
)
 
2
(PO
 
4
)
 
3
19.12.30Fillowite
{Mn
2+
 
}{Na
 
8
}{Ca
 
4
Na
 
4
}{(Mn
2+
 
,Fe
2+
 
)
 
43
}(PO
 
4
)
 
36
19.12.31Johnsomervilleite
Na
 
10
Ca
 
6
Mg
 
18
Fe
 
25
(PO
 
4
)
 
36
19.12.32Wicksite
NaCa
 
2
(Fe
2+
 
,Mn
2+
 
)
 
4
MgFe
3+
 
(PO
 
4
)
 
6
· 2H
 
2
O
19.12.33Dickinsonite-(KMnNa)
{KNa}{Mn
2+
 
◻}{Ca}{Na
 
3
}{Mn
2+
13
}{Al}(PO
 
4
)
 
12
(OH)
 
2
19.12.34Sarcopside
(Fe
2+
 
,Mn
2+
 
,Mg)
 
3
(PO
 
4
)
 
2
19.12.35Ludlamite
(Fe,Mn,Mg)
 
3
(PO
 
4
)
 
2
· 4H
 
2
O
19.12.36Graftonite
(Fe
2+
 
,Mn
2+
 
,Ca)
 
3
(PO
 
4
)
 
2
19.12.37Wilhelmvierlingite
CaMnFe
3+
 
(PO
 
4
)
 
2
(OH) · 2H
 
2
O
19.12.38Fairfieldite
Ca
 
2
(Mn
2+
 
,Fe
2+
 
)(PO
 
4
)
 
2
· 2H
 
2
O
19.12.39Beusite
(Mn
2+
 
,Fe
2+
 
,Ca,Mg)
 
3
(PO
 
4
)
 
2
19.12.40Messelite
Ca
 
2
(Fe
2+
 
,Mn
2+
 
)(PO
 
4
)
 
2
· 2H
 
2
O
19.12.41Jahnsite-(CaMnFe)
{Ca}{Mn
2+
 
}{Fe
2+
2
}{Fe
3+
2
}(PO
 
4
)
 
4
(OH)
 
2
· 8H
 
2
O
19.12.42Jahnsite-(CaMnMn)
{Ca}{Mn
2+
 
}{Mn
2+
2
}{Fe
3+
2
}(PO
 
4
)
 
4
(OH)
 
2
· 8H
 
2
O
19.12.43Jahnsite-(CaMnMg)
{Ca}{Mn
2+
 
}{(Mg,Fe
2+
 
)
 
2
}{Fe
3+
2
}(PO
 
4
)
 
4
(OH)
 
2
· 8H
 
2
O
19.12.44Keckite
CaMn
2+
 
Fe
3+
2
Fe
3+
2
(PO
 
4
)
 
4
(OH)
 
3
(H
 
2
O)
 
7
19.12.45Stanfieldite
Ca
 
7
Ca
 
2
Mg
 
9
(PO
 
4
)
 
12
19.12.46Laubmannite
(Fe
2+
 
,Mn
2+
 
,Ca)
 
3
Fe
3+
6
(PO
 
4
)
 
4
(OH)
 
12
19.12.47Zodacite
Ca
 
4
Mn
2+
 
Fe
3+
4
(PO
 
4
)
 
6
(OH)
 
4
· 12H
 
2
O
19.12.48Hagendorfite
NaCaMn
2+
 
Fe
2+
2
(PO
 
4
)
 
3
19.12.49Maghagendorfite
(□,Na,)(Na,Ca,Fe
2+
 
)Mn(Mg,Fe
2+
 
,Fe
3+
 
)
 
3
(PO
 
4
)
 
3
19.12.50Varulite
NaCaMn
2+
 
Mn
2+
2
(PO
 
4
)
 
3
19.12.51Griphite
Na
 
4
Li
 
2
Ca
 
6
(Mn
2+
 
,Fe
2+
 
,Mg)
 
19
Al
 
8
(PO
 
4
)
 
24
(F,OH)
 
8
19.12.52Attakolite
(Ca,Sr)Mn(Al,Fe)
 
4
(HPO
 
4
,PO
 
4
)
 
3
(SiO
 
4
,PO
 
4
)(OH)
 
4
19.12.53Arrojadite-(KFe)
{KNa}{Fe
2+
 
◻}{Ca}{Na
 
2
◻}{Fe
2+
13
}{Al}(PO
 
4
)
 
11
(HPO
 
4
)(OH)
 
2
19.12.54Lun'okite
(Mn,Ca)(Mg,Fe,Mn)Al(PO
 
4
)
 
2
OH · 4H
 
2
O
19.12.55Eosphorite
(Mn
2+
 
,Fe
2+
 
)Al(PO
 
4
)(OH)
 
2
· H
 
2
O
19.12.56Ernstite
(Mn
2+
 
,Fe
3+
 
)Al(PO
 
4
)(OH,O)
 
2
· H
 
2
O
19.12.57Childrenite
(Fe
2+
 
,Mn
2+
 
)Al(PO
 
4
)(OH)
 
2
· H
 
2
O
19.12.58Bobfergusonite
Na
 
2
Mn
 
5
FeAl(PO
 
4
)
 
6
19.12.59Qingheiite
NaMn
3+
 
Mg(Al,Fe
3+
 
)(PO
 
4
)
 
3
19.12.60Whiteite-(CaFeMg)
{Ca}{(Fe
2+
 
,Mn
2+
 
)}{Mg
 
2
}{Al
 
2
}(PO
 
4
)
 
4
(OH)
 
2
· 8H
 
2
O
19.12.61Whiteite-(CaMnMg)
{Ca}{Mn
2+
 
}{Mg
 
2
}{Al
 
2
}(PO
 
4
)
 
4
(OH)
 
2
· 8H
 
2
O
19.12.62Whiteite-(MnFeMg)
{(Mn
2+
 
,Ca)}{(Fe
2+
 
,Mn
2+
 
)}{Mg
 
2
}{Al
 
2
}(PO
 
4
)
 
4
(OH)
 
2
· 8H
 
2
O
19.12.63Rittmannite
{(Mn
2+
 
,Ca)}{Mn
2+
 
}{(Fe
2+
 
,Mn
2+
 
,Mg)
 
2
}{(Al,Fe
3+
 
)
 
2
}(PO
 
4
)
 
4
(OH)
 
2
· 8H
 
2
O
19.12.64Zanazziite
Ca
 
2
Mg
 
5
Be
 
4
(PO
 
4
)
 
6
(OH)
 
4
· 6H
 
2
O
19.12.65Samuelsonite
(Ca,Ba)Ca
 
8
Fe
2+
2
Mn
2+
2
Al
 
2
(PO
 
4
)
 
10
(OH)
 
2

Other Names for Reddingite

Other Languages:
German:Reddingit
Spanish:Reddingita

Other Information

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

References for Reddingite

Reference List:

- +
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 Reddingite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Reddingite details from Handbook of Mineralogy (PDF)
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  • Localities for Reddingite

    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.
    (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.
    Argentina
     
    • 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.
    Brazil
     
    • Minas Gerais
      • Doce valley
        • 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
    China
     
    • Guizhou Province
      • Tongren Prefecture
        • Songtao Co.
          • Songtao Mn ore field
    Qi Zhou, Yuansheng Du, and Ying Qin (2013): Mineral Deposits 32(3), 457-466
    Finland
     
    • Western and Inner Finland Region
      • Orivesi
        • Eräjärvi area
    Sandström, F. & Lahti, S.I. (2009): Viitaniemipegmatiten i Eräjärvi, Orivesi, Finland. Litiofilen 26 (1): 11-38
    Germany
     
    • Bavaria
      • Upper Palatinate
        • Plößberg
    Weiss: "Mineralfundstellen, Deutschland West", 1990
        • Waidhaus
          • Hagendorf
    Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
    http://www.berthold-weber.de/h_miner.htm
    Japan
     
    • Honshu Island
      • Kanto Region
        • Ibaraki Prefecture
          • Kasumigaura City
            • Chiyoda-machi
    Matsubara & Kato (1980) Koubutsugaku Zasshi, 14, 269-286.
    Portugal
     
    • Guarda District
      • Sabugal
        • Bendada
    Schnorrer-Köhler (1991), Mineral Occurrences.
    Pedro Alves collection
    • Viana do Castelo District
      • 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
        • Cubos-Mesquitela-Mangualde area
    Mineralien Atlas
    USA
     
    • Connecticut
      • Fairfield Co.
        • Ridgefield
          • 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)
    Januzzi, 1976. Mineral Localities of Connecticut and Southeastern New York State (Taylor Assoc./Mineralogical Press)
    • 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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