Diadochite Mineral Data

[Newest Minerals] [Minerals for Sale] [Educational Articles] [About Us] [Image Gallery]
John Betts - Fine Minerals
Classic minerals, out-of-print books & magazines, plus informative articles for collectors

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.

Name Pronunciation:

Diadochite + Pronunciation

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Diaphaneity:

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= 0.054 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2592,KPDmeas= 0.2886,KC= 0.2741
Ncalc = 1.55 - 1.67

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:

Bulk Density (Electron Density)=2.22 gm/cc
note: Specific Gravity of Diadochite =2.20 gm/cc.

Fermion Index:

Fermion Index = 0.0063707122
Boson Index = 0.9936292878

Photoelectric:

PE_Diadochite= 8.42 barns/electron
U=PE_Diadochite x rElectron Density= 18.70 barns/cc.

Radioactivity:

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

Diadochite Classification

Dana Class:

43.05.02.01 (43)Compound Phosphates, etc.

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

(43.05.02)Dana Group

43.05.02.01 Diadochite Fe2(PO4)(SO4)(OH)•6(H2O) P1 1

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

References:

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

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 - 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

Search for Diadochite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Diadochite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Diadochite Mineral Data :

Ask about Diadochite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Diadochite

Fe+++2(PO4)(SO4)(OH)•6(H2O)
Dana No: 43.05.02.01 Strunz No: 08.DB.05
Locality:

Notes: