Diadochite Mineral Data

Diadochite Mineral Data +

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General Diadochite Information

Chemical Formula:

Fe+++2(PO4)(SO4)(OH)·6(H2O)

Composition:

Molecular Weight = 427.83 gm

Iron 26.11 % Fe 37.33 % Fe₂O₃

Phosphorus 7.24 % P 16.59 % P₂O₅

Hydrogen 3.06 % H 27.37 % H₂O

Sulfur 7.50 % S 18.71 % SO₃

Oxygen 56.10 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺₂(SO₄)(PO₄)(OH)·6(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1837

Locality:

Ansbach, Thuringia, Germany. Link to MinDat.org Location Data.

Name Origin:

From the Greek, diadochos, meaning "successor," presumably in allusion to its secondary origin.

Synonym:

Destinezite - xtls

Diadochite Image

Images:

Diadochite

Comments: Brown balls of diadochite on matrix.
Location: Union Carbide mine, Garland County, Arkansas, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Diadochite Crystallography

Axial Ratios:

a:b:c =0.9849:1:0.7526

Cell Dimensions:

a = 9.57, b = 9.716, c = 7.313, Z = 2; alpha = 98.74°, beta = 107.9°, gamma = 63.86° V = 574.14 Den(Calc)= 2.47

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 4.35(1), 8.3(0.9), 8.7(0.8),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
I - Data Info
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Peacor D R , Rouse R C , Coskren T D , Essene E J , Clays and Clay Minerals , 47 (1999) p.1-11, Destinezite ( diadochite ), Fe2(PO4)(SO4)(OH)*6(H2O):, its crystal structure and role as a soil mineral at Alum Cave Bluff,Tennessee, Locality: Alum Cave Bluff, Tennessee, USA

Physical Properties of Diadochite

Cleavage:

None

Color:

Yellow, Brown, Yellowish green, Cinnamon brown, Yellowish white.

Density:

2 - 2.4, Average = 2.2

Diaphaniety:

Translucent to Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Nodular - Tuberose forms having irregular protuberances over the surface.

Habit:

Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite).

Hardness:

3-3.5 - Calcite-Copper Penny

Luster:

Waxy

Streak:

yellow

Optical Properties of Diadochite

Gladstone-Dale:

CI meas= -0.053 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.062 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2571,KPDmeas= 0.2886,KC= 0.2741

Optical Data:

Biaxial (+), a=1.615, b=1.625, g=1.665, bire=0.0500, 2V(Calc)=56, 2V(Meas)=55. Dispersion r < v strong.

Calculated Properties of Diadochite

Electron Density:

r_electron=2.22 gm/cc
note: r_Diadochite=2.20 gm/cc.

Fermion Index

Fermion Index = 0.00637
Boson Index = 0.99363

Photoelectric:

PE_Diadochite= 8.42 barns/electron
U=PE_Diadochite x r_electron= 18.70 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Diadochite is Not Radioactive

Diadochite Classification

Dana Class:

43.5.2.1 (43)Compound Phosphates, etc.

(43.5)(Hydrated Compound Anions With Hydroxyl or Halogen)

(43.5.2)Dana Group

43.5.2.1 Diadochite Fe2(PO4)(SO4)(OH)·6(H2O) P1 1

Strunz Class:

VII/D.05-20 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.05 - Pitticite - Zykaite series

VII/D.05-10 Pitticite Hydrousferricarsenatesulfate(Fe,AsO4,SO4,H2O) None

VII/D.05-20 Diadochite Fe2(PO4)(SO4)(OH)·6(H2O) P1 1

VII/D.05-30 Sarmientite Fe2(AsO4)(SO4)(OH)·5(H2O) P 2₁/c 2/m

VII/D.05-40 Bukovskyite Fe2(AsO4)(SO4)(OH)·7(H2O) P1 or P1 Tri

VII/D.05-50 Tooeleite Fe(8-2x)[(As(1-x),S(x))O4]6·5(H2O) Pbcm,Pbc21 Ortho

VII/D.05-60 Zykaite Fe4(AsO4)3(SO4)(OH)·15(H2O) Unk Ortho

Other Diadochite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(AmMin, V 85, p266) OPTIC PROP.(Ford32)

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Diadochite

Fe+++2(PO4)(SO4)(OH)·6(H2O)
Dana No: 43.5.2.1 Strunz No: VII/D.05-20
Locality:

Notes: