Mineralogy Database

Diadochite Mineral Data

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General Diadochite Information

Help on Chemical  Formula: Chemical Formula: Fe+++2(PO4)(SO4)(OH)•6(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Fe3+2(SO4)(PO4)(OH)•6(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1837
Help on Locality: Locality: Ansbach, Thuringia, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek, diadochos, meaning "successor," presumably in allusion to its secondary origin.
Help on Name Pronunciation: Name Pronunciation: Diadochite + Pronunciation Say DIADOCHITE
Help on Synonym: Synonym: Destinezite - xtls

Diadochite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =0.9849:1:0.7526
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.35(1), 8.3(0.9), 8.7(0.8),

Physical Properties of Diadochite

Help on Cleavage: Cleavage: None
Help on Color: Color: Yellow, Brown, Yellowish green, Cinnamon brown, Yellowish white.
Help on Density: Density: 2 - 2.4, Average = 2.2
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Nodular - Tuberose forms having irregular protuberances over the surface.
Help on Habit: Habit: Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite).
Help on Hardness: Hardness: 3-3.5 - Calcite-Copper Penny
Help on Luster: Luster: Waxy
Help on Streak: Streak: yellow

Optical Properties of Diadochite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.053 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.054 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2592,KPDmeas= 0.2886,KC= 0.2741
Ncalc = 1.55 - 1.67
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.22 gm/cc
note: Specific Gravity of Diadochite =2.20 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0063707122
Boson Index = 0.9936292878
Help on Photoelectric: Photoelectric: PEDiadochite = 8.42 barns/electron
U=PEDiadochite x rElectron Density= 18.70 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Diadochite is Not Radioactive

Diadochite Classification

Help on  Dana Class: Dana Class: (43)Compound Phosphates, etc.
  (43.05)(Hydrated Compound Anions With Hydroxyl or Halogen)
  (43.05.02)Dana Group Diadochite Fe2(PO4)(SO4)(OH)•6(H2O) P1 1
Help on  Strunz Class: Strunz Class: 08.DB.05 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DB -With only medium-sized cations, (OH, etc.):RO4 < 1:1
08.DB.05 Diadochite Fe2(PO4)(SO4)(OH)•6(H2O) P1 1
08.DB.05 Pitticite Hydrousferricarsenatesulfate(Fe,AsO4,SO4,H2O) None

Other Diadochite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(AmMin, V 85, p266) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Diadochite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 08.DB.05





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