Reddingite
A valid IMA mineral species - grandfathered
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About Reddingite
Formula:
(Mn2+,Fe2+)3(PO4)2 · 3H2O
Colour:
Colourless, pale pink or yellow, reddish brown to dark brown (altered); colourless, faintly tinted pink in transmitted light
Lustre:
Vitreous, Resinous
Hardness:
3½
Specific Gravity:
3 - 3.2
Crystal System:
Orthorhombic
Member of:
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.
Note: Some "reddingites" may in fact be correianevesite.
Unique Identifiers
Mindat ID:
3378
Long-form identifier:
mindat:1:1:3378:3
GUID
(UUID V4):
(UUID V4):
6edc39e2-1472-4863-a97e-f82919724334
Classification of Reddingite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1878
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
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
C : With only medium-sized cations, RO4:H2O = 1:1.5
40.3.2.3
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
3 : A3(XO4)2·xH2O
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
3 : A3(XO4)2·xH2O
19.12.20
19 : Phosphates
12 : Phosphates of Mn
19 : Phosphates
12 : Phosphates of Mn
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Rdd | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Rdd | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Reddingite
Vitreous, Resinous
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
Streak:
White
Hardness:
3½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
On {010}, poor.
On {010}, poor.
Fracture:
Irregular/Uneven
Density:
3 - 3.2 g/cm3 (Measured) 3.24 g/cm3 (Calculated)
Comment:
Calculated value is for Mn:Fe = 3:1.
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°
Max Birefringence:
δ = 0.031
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
strong
Optical Extinction:
Parallel. X = a; Y = b; Z = c.
Pleochroism:
Visible
Comments:
Buckfield, Maine material:
X = colourless; Y = pinkish brown; Z = pale yellow.
X = colourless; Y = pinkish brown; Z = pale yellow.
Chemical Properties of Reddingite
Formula:
(Mn2+,Fe2+)3(PO4)2 · 3H2O
IMA Formula:
Mn2+3(PO4)2 · 3H2O
Common Impurities:
Fe
Crystallography of Reddingite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pmna
Cell Parameters:
a = 9.49 Å, b = 10.08 Å, c = 8.7 Å
Ratio:
a:b:c = 0.941 : 1 : 0.863
Unit Cell V:
832.24 ų (Calculated from Unit Cell)
Morphology:
Crystals pseudo-octahedral with large {111}, or tabular {010}. The crystals are frequently in parallel grouping. Massive, granular; coarsely fibrous. Forms include {111}, {212}, {221}, {010}, {223}, {122}.
Crystallographic forms of Reddingite
Crystal Atlas:
Image Loading
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Reddingite no.1 - Goldschmidt (1913-1926)
Reddingite no.2 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by
www.smorf.nl.
Toggle
Edge Lines | Miller Indices | Axes
Transparency
Opaque | Translucent | Transparent
View
Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation
Toggle
Edge Lines | Miller Indices | Axes
Transparency
Opaque | Translucent | Transparent
View
Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.20 Å | (100) |
| 2.737 Å | (80) |
| 4.28 Å | (70) |
| 2.657 Å | (70) |
| 2.422 Å | (70) |
| 2.234 Å | (70) |
| 1.625 Å | (70) |
Comments:
Hagendorf, Germany. The pattern is similar to that of phosphoferrite.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 22 : Hydration and low-𝑇 subsurface aqueous alteration (see also #23) | |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Type Occurrence of Reddingite
General Appearance of Type Material:
Minute orthorhombic octahedral crystals. Also massive and granular.
Place of Conservation of Type Material:
No designated type material.
Geological Setting of Type Material:
Granite pegmatite.
Associated Minerals at Type Locality:
Other Language Names for Reddingite
German:Reddingit
Spanish:Reddingita
Relationship of Reddingite to other Species
Member of:
Other Members of this group:
| Correianevesite | Fe2+Mn2+2(PO4)2 · 3H2O | Orth. mmm (2/m 2/m 2/m) |
| Garyansellite | (Mg,Fe)3(PO4)2(OH,O) · 1.5H2O | Orth. mmm (2/m 2/m 2/m) |
| Kryzhanovskite | (Fe3+,Mn2+)3(PO4)2(OH,H2O)3 | Orth. mmm (2/m 2/m 2/m) |
| Landesite | Mn2+3-xFe3+x(PO4)2(OH)x · (3-x)H2O | Orth. mmm (2/m 2/m 2/m) |
| Phosphoferrite | (Fe2+,Mn2+)3(PO4)2 · 3H2O | Orth. mmm (2/m 2/m 2/m) : Pmna |
Forms a series with:
Common Associates
Associated Minerals Based on Photo Data:
| 20 photos of Reddingite associated with Hureaulite | Mn2+5(PO3OH)2(PO4)2 · 4H2O |
| 12 photos of Reddingite associated with Vivianite | Fe2+3(PO4)2 · 8H2O |
| 9 photos of Reddingite associated with Rockbridgeite | Fe2+Fe3+4(PO4)3(OH)5 |
| 9 photos of Reddingite associated with Dickinsonite-(KMnNa) | (KNa)(Mn2+◻)Ca(Na2Na)Mn2+13Al(PO4)11(PO4)(OH)2 |
| 7 photos of Reddingite associated with Triphylite | LiFe2+PO4 |
| 3 photos of Reddingite associated with Correianevesite | Fe2+Mn2+2(PO4)2 · 3H2O |
| 3 photos of Reddingite associated with Landesite | Mn2+3-xFe3+x(PO4)2(OH)x · (3-x)H2O |
| 2 photos of Reddingite associated with Fairfieldite | Ca2Mn2+(PO4)2 · 2H2O |
| 2 photos of Reddingite associated with Rhodochrosite | MnCO3 |
| 2 photos of Reddingite associated with Lithiophilite | LiMn2+PO4 |
Related Minerals - Strunz-mindat Grouping
| 8.CC. | Correianevesite | Fe2+Mn2+2(PO4)2 · 3H2O |
| 8.CC.05 | Garyansellite | (Mg,Fe)3(PO4)2(OH,O) · 1.5H2O |
| 8.CC.05 | Kryzhanovskite | (Fe3+,Mn2+)3(PO4)2(OH,H2O)3 |
| 8.CC.05 | Landesite | Mn2+3-xFe3+x(PO4)2(OH)x · (3-x)H2O |
| 8.CC.05 | Phosphoferrite | (Fe2+,Mn2+)3(PO4)2 · 3H2O |
| 8.CC.10 | Kaatialaite | Fe(H2AsO4)3 · 5H2O |
| 8.CC.15 | Leogangite | Cu10(AsO4)4(SO4)(OH)6 · 8H2O |
Other Information
Thermal Behaviour:
Heating in the closed tube, it whitens at first, then turns yellow and finally brown, but does not become magnetic.
Before the blowpipe, colors the flame pale green and fuses easily (scale = 2) to a blackish-brown non-magnetic globule.
Before the blowpipe, colors the flame pale green and fuses easily (scale = 2) to a blackish-brown non-magnetic globule.
Notes:
Soluble in hydrochloric and nitric 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.
Internet Links for Reddingite
mindat.org URL:
https://www.mindat.org/min-3378.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Reddingite
Reference List:
Localities for Reddingite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
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Hagendorf South Pegmatite, Hagendorf, Waidhaus, Neustadt an der Waldnaab District, Upper Palatinate, Bavaria, Germany