Cassedanneite
A valid IMA mineral species
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About Cassedanneite
Jacques Pierre CASSEDANNE (1928-2017)
Formula:
Pb5(CrO4)2(VO4)2 · H2O
Colour:
Orange-red
Lustre:
Resinous
Hardness:
3½
Specific Gravity:
6.37
Crystal System:
Monoclinic
Name:
Named in 1988 by Fabien P. Cesbron, R. Giraud, F. Pillard, J. F. Poullen in honor of Jacques P. Cassedanne (11 September 1928, Paris, France - 8 September 2017, Brazil) professor of mineralogy of the University of Rio de Janeiro, Brazil. See the caption of his photo for more information.
Type Locality:
Unique Identifiers
Mindat ID:
915
Long-form identifier:
mindat:1:1:915:9
IMA Classification of Cassedanneite
Approved
IMA Formula:
Pb2+5(V5+O4)2(Cr6+O4)2·H2O
Approval year:
1984
First published:
1988
Classification of Cassedanneite
7.FC.20
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
F : Chromates
C : With PO4, AsO4, SiO4
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
F : Chromates
C : With PO4, AsO4, SiO4
43.3.2.2
43 : COMPOUND PHOSPHATES, ETC.
3 : Hydrated Normal Compound Phosphates, etc·
43 : COMPOUND PHOSPHATES, ETC.
3 : Hydrated Normal Compound Phosphates, etc·
22.5.3
22 : Phosphates, Arsenates or Vanadates with other Anions
5 : Phosphates, arsenates or vanadates with chromate, molybdate, niobate or tantalate
22 : Phosphates, Arsenates or Vanadates with other Anions
5 : Phosphates, arsenates or vanadates with chromate, molybdate, niobate or tantalate
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 for Standard |
|---|---|---|
| Cda | 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 Cassedanneite
Resinous
Transparency:
Translucent
Colour:
Orange-red
Streak:
Yellow-orange
Hardness:
3½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Density:
6.37 g/cm3 (Measured) 6.52 g/cm3 (Calculated)
Optical Data of Cassedanneite
Type:
Biaxial (-)
RI values:
nα = 2.395 nγ = 2.260
Birefringence:
0.135
Max. Birefringence:
δ = 0.000
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Reflectivity:
| Wavelength | R1 (%) |
|---|---|
| 440nm | 2.88% |
| 460nm | 2.75% |
| 480nm | 2.66% |
| 500nm | 2.58% |
| 520nm | 2.51% |
| 540nm | 2.46% |
| 560nm | 2.41% |
| 580nm | 2.40% |
| 600nm | 2.39% |
| 620nm | 2.37% |
| 640nm | 2.36% |
| 660nm | 2.35% |
| 680nm | 2.33% |
| 700nm | 2.33% |
| 720nm | 2.33% |
| 740nm | 2.36% |
| 760nm | 2.35% |
| 780nm | 2.37% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 2.88%.
Chemistry of Cassedanneite
Mindat Formula:
Pb5(CrO4)2(VO4)2 · H2O
Element Weights:
Common Impurities:
Cu,Zn,P
Crystallography of Cassedanneite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 7.6938 Å, b = 5.7636 Å, c = 9.7958 Å
β = 115.93°
β = 115.93°
Ratio:
a:b:c = 1.335 : 1 : 1.7
Unit Cell V:
390.65 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Platy on {010}.
Twinning:
Plates are hexagonal in outline due to twinning.
Comment:
Space Group: A2/m, A2, or Am
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.83 Å | (60) |
| 3.15 Å | (100) |
| 3.22 Å | (60) |
| 2.873 Å | (50) |
| 2.825 Å | (30) |
| 2.123 Å | (30) |
| 1.908 Å | (30) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47e : [Vanadates, chromates, manganates] |
Type Occurrence of Cassedanneite
General Appearance of Type Material:
Round aggregates of small crystals.
Place of Conservation of Type Material:
National School of Mines, Paris, France, 16569.
Geological Setting of Type Material:
Oxidized zone of gold-bearing quartz veins.
Associated Minerals at Type Locality:
Synonyms of Cassedanneite
Other Language Names for Cassedanneite
Common Associates
Associations Based on Photo Data:
| 12 photos of Cassedanneite associated with Leadhillite | Pb4(CO3)2(SO4)(OH)2 |
| 12 photos of Cassedanneite associated with Lanarkite | Pb2(SO4)O |
| 12 photos of Cassedanneite associated with Cerussite | PbCO3 |
| 2 photos of Cassedanneite associated with Crocoite | PbCr6+O4 |
| 1 photo of Cassedanneite associated with Vauquelinite | Pb2Cu(CrO4)(PO4)(OH) |
| 1 photo of Cassedanneite associated with Pyromorphite | Pb5(PO4)3Cl |
Related Minerals - Strunz-mindat Grouping
| 7.FC.05 | Vauquelinite | Pb2Cu(CrO4)(PO4)(OH) |
| 7.FC.10 | Fornacite | Pb2Cu(CrO4)(AsO4)(OH) |
| 7.FC.10 | Molybdofornacite | Pb2Cu(MoO4,CrO4)(AsO4,PO4)(OH) |
| 7.FC.15 | Hemihedrite | Pb10Zn(CrO4)6(SiO4)2(OH)2 |
| 7.FC.15 | Raygrantite | Pb10Zn(SO4)6(SiO4)2(OH)2 |
| 7.FC.15 | Iranite | Pb10Cu(CrO4)6(SiO4)2(OH)2 |
| 7.FC.20 | Embreyite | Pb5(CrO4)2(PO4)2 · H2O |
Fluorescence of Cassedanneite
Not fluorescent in UV
Other Information
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 Cassedanneite
mindat.org URL:
https://www.mindat.org/min-915.html
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Please feel free to link to this page.
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References for Cassedanneite
Localities for Cassedanneite
Showing 6 localities.
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Russia | |
| Pekov et al. (2026) |
| Cesbron et al. (1988) +1 other reference |
South Africa | |
| Atanasova et al. (2016) |
| SAMS (South African Micromount Society) |
UK | |
| S.Rust Collection |
| Neall (2005) |
Quick NavTopAbout CassedanneiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Berezovsk deposit, Beryozovsky, Sverdlovsk Oblast, Russia