Diadochite
A valid IMA mineral species - grandfathered
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About Diadochite
Formula:
Fe3+2(PO4)(SO4)(OH) · 6H2O
Colour:
Yellow to greenish-yellow or brown, reddish brown, light green, light yellow; pale yellow to yellowish brown in transmitted light.
Lustre:
Resinous, Waxy, Greasy, Dull, Earthy
Hardness:
3 - 4
Specific Gravity:
2.0 - 2.4
Crystal System:
Amorphous
Name:
Named in 1837 by Johann Friedric August Breithaupt from the Greek διάδοχος for "successor," presumably in allusion to its secondary origin.
An amorphous ferric iron phosphate-sulphate. Visually similar to destinezite, with which it was often confused, until destinezite was (re)defined as the crystalline equivalent of the amorphous diadochite. (IMA decision 00-E)
A secondary mineral occurring in gossans and coal deposits as the result of sulfate-rich solutions reacting with earlier phosphates; common in secondary phosphate assemblages in granitic pegmatites; in cave deposits, or as a post-mining product.
A secondary mineral occurring in gossans and coal deposits as the result of sulfate-rich solutions reacting with earlier phosphates; common in secondary phosphate assemblages in granitic pegmatites; in cave deposits, or as a post-mining product.
Unique Identifiers
Mindat ID:
1279
Long-form identifier:
mindat:1:1:1279:5
GUID
(UUID V4):
(UUID V4):
af2c6307-91a6-4ce0-8621-0cc28a5267e5
IMA Classification of Diadochite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1837
Classification of Diadochite
8.DB.05
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
B : With only medium-sized cations, (OH, etc.):RO4< 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
B : With only medium-sized cations, (OH, etc.):RO4< 1:1
Dana 7th ed.:
43.5.2.1
43.5.2.1
43 : COMPOUND PHOSPHATES, ETC.
5 : Hydrated Compound Phosphates, etc·, Containing Hydroxyl or Halogen
43 : COMPOUND PHOSPHATES, ETC.
5 : Hydrated Compound Phosphates, etc·, Containing Hydroxyl or Halogen
22.3.25
22 : Phosphates, Arsenates or Vanadates with other Anions
3 : Phosphates, arsenates or vanadates with sulphates
22 : Phosphates, Arsenates or Vanadates with other Anions
3 : Phosphates, arsenates or vanadates with sulphates
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Ddc | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Diadochite
Resinous, Waxy, Greasy, Dull, Earthy
Transparency:
Transparent, Translucent, Opaque
Comment:
Lustre dull in earthy material, waxy, horn-like in gel masses.
Colour:
Yellow to greenish-yellow or brown, reddish brown, light green, light yellow; pale yellow to yellowish brown in transmitted light.
Streak:
Yellow to yellow-brown
Hardness:
3 - 4 on Mohs scale
Hardness Data:
Measured
Tenacity:
Fragile
Cleavage:
None Observed
Fracture:
Conchoidal, Sub-Conchoidal
Density:
2.0 - 2.4 g/cm3 (Measured) 2.32 g/cm3 (Calculated)
Optical Data of Diadochite
Type:
Biaxial (+)
RI values:
nα = 1.615 nβ = 1.618 - 1.638 nγ = 1.665 - 1.670 n = 1.60 - 1.61
2V:
Measured: 55°
Birefringence:
0.06
Max Birefringence:
δ = 0.050 - 0.055
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v strong
Pleochroism:
Non-pleochroic
Comments:
Isotropic when glassy. Measured 2V = small.
Chemistry of Diadochite
Mindat Formula:
Fe3+2(PO4)(SO4)(OH) · 6H2O
Crystallography of Diadochite
Crystal System:
Amorphous
Morphology:
Found as nodules or colloform crusts, massive; glassy, earthy.
Comment:
Amorphous to x-rays.
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
8.74 Å | (100) |
8.28 Å | (90) |
4.377 Å | (100) |
4.082 Å | (65) |
3.929 Å | (85) |
2.942 Å | (65) |
2.918 Å | (40) |
Comments:
Also ICDD 42-1364
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
21 : Chemically precipitated carbonate, phosphate, iron formations | |
High-? alteration and/or metamorphism | |
31 : Thermally altered carbonate, phosphate, and iron formations | |
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47b : [Sulfates and sulfites] | |
47c : [Carbonates, phosphates, borates, nitrates] | |
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
50 : Coal and/or oil shale minerals | <0.36 |
52 : Guano- and urine-derived minerals | <0.4 |
Stage 10b: Anthropogenic minerals | <10 Ka |
54 : Coal and other mine fire minerals (see also #51 and #56) |
Geological Setting:
Gossan deposits, coal deposits, late stage mineralization in granitic pegmatites, caves, post-mining deposition.
Type Occurrence of Diadochite
General Appearance of Type Material:
Kidney-shaped and stalactite-like shapes.
Place of Conservation of Type Material:
Mining Academy, Freiberg, Saxony, Germany, number 20765.
Geological Setting of Type Material:
Slate altered by ground water, perhaps originally post-mine in occurrence.
Associated Minerals at Type Locality:
Synonyms of Diadochite
Other Language Names for Diadochite
Varieties of Diadochite
Geldiadochite | A gel form of Diadochite |
Common Associates
Associated Minerals Based on Photo Data:
8 photos of Diadochite associated with Mitridatite | Ca2Fe3+3(PO4)3O2 · 3H2O |
8 photos of Diadochite associated with Hydroxylapatite | Ca5(PO4)3(OH) |
6 photos of Diadochite associated with Messelite | Ca2Fe2+(PO4)2 · 2H2O |
6 photos of Diadochite associated with Todorokite | (Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O |
4 photos of Diadochite associated with Cacoxenite | Fe3+24AlO6(PO4)17(OH)12 · 75H2O |
3 photos of Diadochite associated with Strunzite | Mn2+Fe3+2(PO4)2(OH)2 · 6H2O |
3 photos of Diadochite associated with Cassiterite | SnO2 |
2 photos of Diadochite associated with Purpurite | Mn3+(PO4) |
2 photos of Diadochite associated with Monazite | REE(PO4) |
2 photos of Diadochite associated with Dickinsonite-(KMnNa) | (KNa)(Mn2+◻)Ca(Na2Na)Mn2+13Al(PO4)11(PO4)(OH)2 |
Related Minerals - Strunz-mindat Grouping
8.DB. | Arangasite | Al2F(PO4)(SO4) · 9H2O |
8.DB. | Camaronesite | [Fe3+(H2O)2(PO3OH)]2(SO4) · 1-2H2O |
8.DB. | Höslite | Fe3+3(VO4)2(SO4)(OH)(H2O)4 · 3H2O |
8.DB.05 | Pitticite | (Fe, AsO4, H2O) (?) |
8.DB.05 | Destinezite | Fe3+2(PO4)(SO4)(OH) · 6H2O |
8.DB.07 | Wilhelmgümbelite | ZnFe2+Fe3+3(PO4)3(OH)4(H2O)5 · 2H2O |
8.DB.07 | Schmidite | [Zn2(Fe3+,Mn2+)2Fe3+(PO4)3(OH)3(H2O)6] · 2H2O |
8.DB.07 | Wildenauerite | Zn(Fe3+,Mn2+)2MnFe3+(PO4)3(OH)3(H2O)6 · 2H2O |
8.DB.10 | Vashegyite | Al11(PO4)9(OH)6 · 38H2O |
8.DB.15 | Schoonerite | ZnMn2+Fe2+2Fe3+(PO4)3(OH)2 · 9H2O |
8.DB.20 | Sinkankasite | Mn2+Al(PO3OH)2(OH) · 6H2O |
8.DB.25 | Mitryaevaite | Al6(PO4)((P,S)O3(OH,O))2F2(OH)2 · 14.5H2O |
8.DB.30 | Sanjuanite | Al2(PO4)(SO4)(OH) · 9H2O |
8.DB.35 | Sarmientite | Fe3+2(AsO4)(SO4)(OH) · 5H2O |
8.DB.40 | Bukovskýite | Fe3+2(AsO4)(SO4)(OH) · 9H2O |
8.DB.40 | Flurlite | Zn3Mn2+Fe3+(PO4)3(OH)2 · 9H2O |
8.DB.40 | Manganflurlite | ZnMn2+3Fe3+(PO4)3(OH)2(H2O)7 · 2H2O |
8.DB.42 | Bohuslavite | Fe3+4(PO4)3(SO4)(OH) · nH2O |
8.DB.45 | Zýkaite | Fe3+4(AsO4)3(SO4)(OH) · 15H2O |
8.DB.47 | Lapeyreite | Cu3O[AsO3(OH)]2 · 0.75H2O |
8.DB.50 | Giniite | Fe2+Fe3+4(PO4)3(OH)5 · 2H2O |
8.DB.50 | Rossiantonite | Al3(PO4)(SO4)2(OH)2(H2O)14 |
8.DB.52 | Arctowskite | Al9(PO4)8(OH)3 · 27H2O |
8.DB.55 | Sasaite | (Al,Fe3+)14(PO4)11(SO4)(OH)7 · 83H2O |
8.DB.60 | Mcauslanite | Fe3Al2(PO4)3(PO3OH)F · 18H2O |
8.DB.65 | Goldquarryite | CuCd2Al3(PO4)4F2(H2O,F)2 · 10H2O |
8.DB.70 | Birchite | Cd2Cu2(PO4)2(SO4) · 5H2O |
8.DB.75 | Braithwaiteite | NaCu5(Ti4+Sb5+)(AsO4)4(HAsO4)2O2 · 8H2O |
Fluorescence of Diadochite
Not fluorescent
Other Information
Notes:
Readily soluble in acids.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Diadochite
mindat.org URL:
https://www.mindat.org/min-1279.html
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External Links:
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References for Diadochite
Reference List:
Larsen, Esper S. (1921) The microscopic determination of the nonopaque minerals. Bulletin Vol. 679. US Geological Survey doi:10.3133/b679 p.67
Hintze, Carl (1931) Handbuch der Mineralogie. Berlin and Leipzig. 6 volumes: 1 [4B]: 750, 755, 1073.
Localities for Diadochite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
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Quick NavTopAbout DiadochiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesVarietiesCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Richelle, Visé, Liège, Wallonia, Belgium