Reddingite Mineral Data

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.

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.
© Minernet

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),

Forms:

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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

Diaphaniety:

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

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:

r_electron=3.02 gm/cc
note: r_Reddingite=3.10 gm/cc.

Fermion Index

Fermion Index = 0.0002
Boson Index = 0.9998

Photoelectric:

PE_Reddingite= 11.00 barns/electron
U=PE_Reddingite x r_electron= 33.20 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Reddingite is Not Radioactive

Reddingite Classification

Dana Class:

40.3.2.3 (40)Hydrated Phosphates, etc

(40.3)where (A++)3 (XO4)2 · x(H2O)

(40.3.2)Dana Group

40.3.2.1 Phosphoferrite (Fe,Mn)3(PO4)2·3(H2O) Pmna 2/m 2/m 2/m

40.3.2.2 Kryzhanovskite MnFe2(PO4)2(OH)2·(H2O) Pbna 2/m 2/m 2/m

40.3.2.3 Reddingite Mn3(PO4)2·3(H2O) Pbna 2/m 2/m 2/m

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

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

Strunz Class:

VII/C.08-20 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.08 - Phosphoferrite - Kryzhanovskite series

VII/C.08-10 Phosphoferrite (Fe,Mn)3(PO4)2·3(H2O) Pmna 2/m 2/m 2/m

VII/C.08-20 Reddingite Mn3(PO4)2·3(H2O) Pbna 2/m 2/m 2/m

VII/C.08-30 Garyansellite (Mg,Fe)3(PO4)2(OH,O)·1,5(H2O) Pbna 2/m 2/m 2/m

VII/C.08-40 Kryzhanovskite MnFe2(PO4)2(OH)2·(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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Reddingite

Mn++3(PO4)2·3(H2O)
Dana No: 40.3.2.3 Strunz No: VII/C.08-20
Locality:

Notes: