Reddingite Mineral Data

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General Reddingite Information

Chemical Formula:

Mn++3(PO4)2•3(H2O)

Composition:

Molecular Weight = 408.80 gm

Manganese 40.32 % Mn 52.06 % MnO

Phosphorus 15.15 % P 34.72 % P₂O₅

Hydrogen 1.48 % H 13.22 % H₂O

Oxygen 43.05 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₃(PO₄)₂•3(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1878

Locality:

Branchville, in the town of Redding, Fairfield Co., Connecticut. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Name Pronunciation:

Reddingite + Pronunciation

Reddingite Image

Images:

Reddingite

Comments: Opaque brown crystalline reddingite.
Location: Tip Top Quarry, Custer County, South Dakota, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Reddingite

Comments: Brown crystals of reddingite on matrix.
Location: Boa Vista creek, Minas Gerais, Brazil. Scale: Crystal size 1 mm.
© Sandro Maggia/Minernet.it

Images:

Reddingite

Comments: Golden brown to brown, highly lustrous, pseudo-octahedral crystals of reddinite.
Location: Cigana mine, Galileia, Minas Gerais, Brazil. Scale: Crystal size 0.5 mm.
© Tom Loomis / Dakota Matrix

Reddingite Crystallography

Axial Ratios:

a:b:c =0.9414:1:0.863

Cell Dimensions:

a = 9.49, b = 10.08, c = 8.7, Z = 4; V = 832.23 Den(Calc)= 3.26

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbna

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.2(1), 2.737(0.8), 4.28(0.7),

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Forms: ( 2 1 2) ( 1 1 1) ( 3 2 2) ( 3 1 1) ( 1 2 2)

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Physical Properties of Reddingite

Cleavage:

{010} Indistinct

Color:

White, Yellowish white, Colorless, Reddish brown, Dark brown.

Density:

3.1

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

3.5 - Copper Penny

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Resinous

Streak:

white

Optical Properties of Reddingite

Gladstone-Dale:

CI meas= -0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.038 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2031,KPDmeas= 0.2135,KC= 0.211
Ncalc = 1.65 - 1.69

Optical Data:

Biaxial (+), a=1.643-1.658, b=1.648-1.664, g=1.674-1.685, bire=0.0270-0.0310, 2V(Calc)=48-58, 2V(Meas)=41-65. Dispersion strong, r > v.

Calculated Properties of Reddingite

Electron Density:

Bulk Density (Electron Density)=3.02 gm/cc
note: Specific Gravity of Reddingite =3.10 gm/cc.

Fermion Index:

Fermion Index = 0.0002088635
Boson Index = 0.9997911365

Photoelectric:

PE_Reddingite= 11.00 barns/electron
U=PE_Reddingite x rElectron Density= 33.20 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Reddingite is Not Radioactive

Reddingite Classification

Dana Class:

40.03.02.03 (40)Hydrated Phosphates, etc

(40.03)where (A++)3 (XO4)2 · x(H2O)

(40.03.02)Phosphoferrite Group

40.03.02.01 Phosphoferrite (Fe,Mn)3(PO4)2•3(H2O) Pmna 2/m 2/m 2/m

40.03.02.02 Kryzhanovskite MnFe2(PO4)2(OH)2•(H2O) Pbna 2/m 2/m 2/m

40.03.02.03 Reddingite Mn3(PO4)2•3(H2O) Pbna 2/m 2/m 2/m

40.03.02.04 Landesite (Mn,Mg)9Fe3(PO4)8(OH)3•9(H2O) Pmna 2/m 2/m 2/m

40.03.02.05 Garyansellite (Mg,Fe)3(PO4)2(OH,O)•1,5(H2O) Pbna 2/m 2/m 2/m

Strunz Class:

08.CC.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CC -With only medium-sized cations, RO4:H2O = 1:1.5

08.CC.05 Garyansellite (Mg,Fe)3(PO4)2(OH,O)•1,5(H2O) Pbna 2/m 2/m 2/m

08.CC.05 Kryzhanovskite MnFe2(PO4)2(OH)2•(H2O) Pbna 2/m 2/m 2/m

08.CC.05 Landesite (Mn,Mg)9Fe3(PO4)8(OH)3•9(H2O) Pmna 2/m 2/m 2/m

08.CC.05 Phosphoferrite (Fe,Mn)3(PO4)2•3(H2O) Pmna 2/m 2/m 2/m

08.CC.05 Reddingite Mn3(PO4)2•3(H2O) Pbna 2/m 2/m 2/m

Other Reddingite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Reddingite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Reddingite Specimen Label here :

Reddingite

Mn++3(PO4)2•3(H2O)
Dana No: 40.03.02.03 Strunz No: 08.CC.05
Locality:

Notes: