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Reddingite

Big Photo

Cigana Mine (Jocão Mine), Galiléia, Doce valley, Minas Gerais, Southeast Region, Brazil
© Dick Dionne

Show Reddingite Photos (24)
Formula:
(Mn,Fe)
 
3
(PO
 
4
)
 
2
·3H
 
2
O
System:OrthorhombicColour:Colourless, pale pink or ...
Hardness:3½
Name:For the type locality at Branchville, in the town of Redding, Fairfield Co., Connecticut, USA.


Phosphoferrite Group, Phosphoferrite-Reddingite Series.

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:Branchville Mica mine (Branchville Quarry; Fillow Quarry), Branchville, 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):3½
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 (P2/m 2/n 21/a)
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)

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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,Fe)
 
3
(PO
 
4
)
 
2
·3H
 
2
O
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)
Related Minerals - Nickel-Strunz Grouping):
8.CC.05Garyansellite
(Mg,Fe)
 
3
(PO
 
4
)
 
2
(OH,O)·1.5H
 
2
O
8.CC.05Kryzhanovskite
MnFe
 
2
(PO
 
4
)
 
2
(OH)
 
2
·H
 
2
O
8.CC.05Landesite
Mn
2+
3-x
Fe
3+
x
[(OH)
 
x
|(PO
 
4
)
 
2
] · (3-x)H
 
2
O
8.CC.05Phosphoferrite
(Fe,Mn)
 
3
(PO
 
4
)
 
2
·3H
 
2
O
8.CC.10Kaatialaite
Fe(H
 
2
AsO
 
4
)
 
3
·5H
 
2
O
8.CC.15Leogangite
Cu
 
10
[(OH)
 
6
|SO
 
4
|(AsO
 
4
)
 
4
] · 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
[OH|PO
 
4
]
 
2
 · 4H
 
2
O
19.12.3Natrophilite
NaMn
2+
 
[PO
 
4
]
19.12.4Sidorenkite
Na
 
3
Mn
2+
 
[PO
 
4
|CO
 
3
]
19.12.5Niahite
(NH
 
4
)(Mn
2+
 
,Mg)[PO
 
4
] · H
 
2
O
19.12.6Robertsite
Ca
 
3
Mn
3+
4
[(OH)
 
3
|(PO
 
4
)
 
2
]
 
2
 · 3H
 
2
O
19.12.7Pararobertsite
Ca
 
2
Mn
3+
3
[O
 
2
|(PO
 
4
)
 
3
] · 3H
 
2
O
19.12.8Sinkankasite
H
 
2
Mn
2+
 
Al[OH|(PO
 
4
)
 
2
] · 6H
 
2
O
19.12.9Mangangordonite
Mn
2+
 
Al
 
2
[OH|PO
 
4
]
 
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
[OH|PO
 
4
]
19.12.13Triploidite
(Mn
2+
 
,Fe
2+
 
)
 
2
[OH|PO
 
4
]
19.12.14Lipscombite
(Fe
2+
 
,Mn
2+
 
)Fe
3+
2
[OH|PO
 
4
]
 
2
19.12.15Frondelite
Mn
2+
 
Fe
3+
4
[(OH)
 
5
|(PO
 
4
)
 
3
]
19.12.16Rockbridgeite
Fe
2+
 
Fe
3+
4
[(OH)
 
5
|(PO
 
4
)
 
3
]
19.12.17Kryzhanovskite
MnFe
 
2
(PO
 
4
)
 
2
(OH)
 
2
·H
 
2
O
19.12.18Landesite
Mn
2+
3-x
Fe
3+
x
[(OH)
 
x
|(PO
 
4
)
 
2
] · (3-x)H
 
2
O
19.12.19Phosphoferrite
(Fe,Mn)
 
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
H
 
2
(PO
 
4
)
 
4
·4H
 
2
O
19.12.23Switzerite
(Mn,Fe)
 
3
(PO
 
4
)
 
2
·7H
 
2
O
19.12.24Laueite
Mn
2+
 
Fe
3+
2
[OH|PO
 
4
]
 
2
 · 8H
 
2
O
19.12.25Pseudolaueite
Mn
2+
 
Fe
3+
2
[OH|PO
 
4
]
 
2
 · 8H
 
2
O
19.12.26Strunzite
Mn
2+
 
Fe
3+
2
[OH|PO
 
4
]
 
2
 · 6H
 
2
O
19.12.27Stewartite
Mn
2+
 
Fe
3+
2
[OH|PO
 
4
]
 
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
{Ca}{Na
 
6
[ ]
 
2
}{Ca
 
6
Na
 
2
}{(Fe
2+
 
,Mg,Mn
2+
 
)
 
43
}[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}[(OH)
 
2
|(PO
 
4
)
 
12
]
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+
 
[OH|(PO
 
4
)
 
2
] · 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)
CaMn
2+
 
Fe
2+
2
Fe
3+
2
(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
19.12.42Jahnsite-(CaMnMn)
CaMn
2+
 
Mn
2+
2
Fe
3+
2
(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
19.12.43Jahnsite-(CaMnMg)
CaMn
2+
 
(Mg,Fe
2+
 
)
 
2
Fe
3+
2
(PO
 
4
)
 
4
(OH)
 
2
 · 8H
 
2
O
19.12.44Keckite
(Ca,Mg)(Mn
2+
 
,Zn)
 
2
Fe
3+
3
(PO
 
4
)
 
4
(OH)
 
3
 · 2H
 
2
O
19.12.45Stanfieldite
Ca
 
7
Ca
 
2
Mg
 
9
[PO
 
4
]
 
12
19.12.46Laubmannite
(Fe
2+
 
,Mn
2+
 
,Ca)
 
3
Fe
3+
6
[(OH)
 
3
|PO
 
4
]
 
4
19.12.47Zodacite
Ca
 
4
Mn
2+
 
Fe
3+
4
[(OH)
 
2
|(PO
 
4
)
 
3
]
 
2
 · 12H
 
2
O
19.12.48Hagendorfite
NaCaMn
2+
 
Fe
2+
2
(PO
 
4
)
 
3
19.12.49Maghagendorfite
NaMn(Mg,Fe,Fe)
 
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
[(F,OH)|(PO
 
4
)
 
3
]
 
8
19.12.52Attakolite
(Ca,Sr)Mn(Al,Fe)
 
4
[(OH)
 
4
|(SiO
 
4
,PO
 
4
)|(HPO
 
4
,PO
 
4
)
 
3
]
19.12.53Arrojadite-(KFe)
{KNa}{Fe
2+
 
[ ]}{Ca}{Na
 
2
[ ]}{Fe
2+
13
}{Al}[(OH)
 
2
|HPO
 
4
|(PO
 
4
)
 
11
]
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[(OH)
 
2
|PO
 
4
] · H
 
2
O
19.12.56Ernstite
(Mn
2+
 
,Fe
3+
 
)Al[(OH,O)
 
2
|PO
 
4
] · H
 
2
O
19.12.57Childrenite
(Fe
2+
 
,Mn
2+
 
)Al[(OH)
 
2
|PO
 
4
] · 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)
CaMn
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,Fe)(Mg,Fe,Al)
 
4
Be
 
4
[(OH)
 
4
|(PO
 
4
)
 
6
] · 6H
 
2
O
19.12.65Samuelsonite
(Ca,Ba)Ca
 
8
Fe
2+
2
Mn
2+
2
Al
 
2
[(OH)
 
2
|(PO
 
4
)
 
10
]

Other Names for Reddingite

German names:
Reddingit
Spanish names:
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.

Internet Links for Reddingite

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    Localities for Reddingite

    Hide Locality List
    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.
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    (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.
    Brazil
     
    • Southeast Region
      • Minas Gerais
        • Doce valley
          • Galiléia
    		Jordi Fabre
            • Sapucaia do Norte
    		AmMin 89:1087
        • São José da Safira
    		Peter Kohorst collection
    Finland
     
    • Etelä-Suomen Lääni
      • Orivesi
        • Eräjärvi area
    		No reference listed
    Germany
     
    • Bavaria
      • Upper Palatinate
        • Oberpfälzer Wald
          • Plößberg
    		Weiss: "Mineralfundstellen, Deutschland West", 1990
          • Vohenstrauß
            • Waidhaus
              • Hagendorf
    		Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
    http://www.berthold-weber.de/h_miner.htm
    Japan
     
    • Honshu Island
      • Kanto Region
        • Ibaraki Prefecture
          • Chiyoda-machi
    		Matsubara & Kato (1980) Koubutsugaku Zasshi, 14, 269-286.
    Portugal
     
    • Guarda District
      • Sabugal
    		Schnorrer-Köhler (1991), Mineral Occurrences.
    USA
     
    • Connecticut
      • Fairfield Co.
        • Branchville
    		American Mineralogist (1946): 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.
      • Middlesex Co.
        • Portland
    		Januzzi, 1976. Mineral Localities of Connecticut and Southeastern New York State (Taylor Assoc./Mineralogical Press)
    • Maine
      • Androscoggin Co.
        • Poland
    		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
    		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: 729.
        • Greenwood
    		No reference listed
        • Newry
    		No reference listed
        • Rumford
    		King, V.T., 1994, Mineralogy of Maine, Descriptive Mineralogy, v.1.
    • New Hampshire
      • Grafton Co.
        • Grafton
    		No reference listed
        • Groton
    		Morrill, 1960. NH Mines and Minerals Localities, 2nd ed.
      • Strafford Co.
        • Strafford
    		Rocks & Min. 80:256 (2005)
    • South Dakota
      • Custer Co.
        • Custer District
          • Custer
    		Seaman, 1976. Pegmatite Minerals of the World
      • Pennington Co.
        • Keystone District
          • Glendale
    		Rocks & Minerals: 75(3): 156-169.
    Mineral and/or Locality
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