Cesbronite
A valid IMA mineral species
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About Cesbronite
Formula:
Cu2+3Te6+O4(OH)4
Formula redefined 2017 (IMA 17-C).
Colour:
Emerald green, 'green beetle'
Hardness:
3
Specific Gravity:
4.45
Crystal System:
Orthorhombic
Name:
Named in 1974 by Sidney Arthur Williams in honor of Fabien P. Cesbron [1938 France - ], French mineralogist with the Bureau de Recherches Geologiques et Miniere, BRGM, Orleans. France.
Redefined in September 2017 as containing Te6+ not Te4+ (Missen et al., 2018). The originally assumed formula was Cu5(Te4+O3)2(OH)6 · 2H2O.
Note: consequently its current placement within the Strunz and Dana tables is now incorrect.
Note: consequently its current placement within the Strunz and Dana tables is now incorrect.
Unique Identifiers
Mindat ID:
940
Long-form identifier:
mindat:1:1:940:5
GUID
(UUID V4):
(UUID V4):
3a14362c-fca7-45cc-9e61-abadb771269b
IMA Classification of Cesbronite
Approved
IMA status notes:
Redefined by the IMA
IMA Formula:
Cu3Te6+O4(OH)4
First published:
1974
Approval history:
Approved by IMA 1974.
Redefined by IMA 2017 (Proposal 17-C), as Cu2+Te6+O4(OH)4
Redefined by IMA 2017 (Proposal 17-C), as Cu2+Te6+O4(OH)4
Classification of Cesbronite
4.JN.15
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
N : Tellurites with additional anions, with H2O
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
N : Tellurites with additional anions, with H2O
Dana 7th ed.:
33.2.8.1
34.7.2.1
34 : SELENITES, TELLURITES AND SULFITES
7 : Hydrated Selenites, Tellurites and Sulfites containing Hydroxyl or Halogen
34 : SELENITES, TELLURITES AND SULFITES
7 : Hydrated Selenites, Tellurites and Sulfites containing Hydroxyl or Halogen
28.3.5
28 : Selenites, Selenates, Tellurites, and Tellurates
3 : Tellurites
28 : Selenites, Selenates, Tellurites, and Tellurates
3 : Tellurites
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 |
|---|---|---|
| Ces | 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 Cesbronite
Transparency:
Transparent
Comment:
'Bright luster'.
Colour:
Emerald green, 'green beetle'
Comment:
Dark green in transmitted light.
Streak:
Pale green
Hardness:
3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
Poor on {010}; good on {021}.
Poor on {010}; good on {021}.
Density:
4.45(2) g/cm3 (Measured) 4.455 g/cm3 (Calculated)
Optical Data of Cesbronite
Type:
Biaxial (+)
RI values:
nα = 1.880(8) nβ = 1.928(8) nγ = 2.029(8)
2V:
Measured: 72° , Calculated: 74°
Max Birefringence:
δ = 0.149
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:
Very High
Dispersion:
r > v, moderate.
Optical Extinction:
X = a; Y = c; Z = b.
Pleochroism:
Strong
Comments:
X = pale bluish green; Y = dark yellow-green; Z = dark emerald-green.
Comments:
Absorption: X ≃ Y >> Z.
Chemistry of Cesbronite
Mindat Formula:
Cu2+3Te6+O4(OH)4
Formula redefined 2017 (IMA 17-C).
Formula redefined 2017 (IMA 17-C).
Elements listed:
Crystallography of Cesbronite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Cmcm
Setting:
Cmcm
Cell Parameters:
a = 2.93172 (16) Å, b = 11.8414(6) Å, c = 8.6047(4) Å
Ratio:
a:b:c = 0.248 : 1 : 0.727
Unit Cell V:
298.72 ų (Calculated from Unit Cell)
Morphology:
Chisel-shaped dipyramidal crystals showing dominant and striated {103}, with {180}, {001}, and {010}.
As hollow crusts of radiating crystals and fanlike aggregates.
As hollow crusts of radiating crystals and fanlike aggregates.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.934 Å | (100) |
| 3.490 Å | (92) |
| 4.889 Å | (71) |
| 2.358 Å | (70) |
| 2.379 Å | (38) |
| 1.592 Å | (34) |
| 2.156 Å | (28) |
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 Cesbronite
General Appearance of Type Material:
Green crystals sometimes forming hollow spherical crusts.
Place of Conservation of Type Material:
Type:
Natural History Museum, Paris; National School of Mines, Paris, France.
National Museum of Natural History, Washington, D.C., USA, number 144518.
Cotype:
The Natural History Museum, London, England, number 1976,405.
Ecole Nationale Supérieure des Mines, Paris, France, numbers 50707, 50708.
Natural History Museum, Paris; National School of Mines, Paris, France.
National Museum of Natural History, Washington, D.C., USA, number 144518.
Cotype:
The Natural History Museum, London, England, number 1976,405.
Ecole Nationale Supérieure des Mines, Paris, France, numbers 50707, 50708.
Geological Setting of Type Material:
Oxidized tellurium-copper-lead veins. Very late stage.
Reference:
Williams, S.A. (1974) Cesbronite, a new copper tellurite from Moctezuma, Sonora. Mineralogical Magazine: 39: 744-746.
Synonyms of Cesbronite
Other Language Names for Cesbronite
German:Cesbronit
Spanish:Cesbronita
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 4.JN. | Tombstoneite | (Ca0.5Pb0.5)Pb3Cu2+6Te6+2O6(Te4+O3)6(Se4+O3)2(SO4)2 · 3H2O |
| 4.JN. | Ozernovskite | Fe3+4(Te4+O4)(Te4+O3)4 · 7H2O |
| 4.JN.05 | Sonoraite | Fe3+(TeO3)(OH) · H2O |
| 4.JN.10 | Poughite | Fe3+2(TeO3)2(SO4)(H2O)2 · H2O |
| 4.JN.20 | Eztlite | Pb2+2Fe3+3(Te4+ O3)3(SO4)O2Cl |
| 4.JN.30 | Juabite | CaCu10(TeO3)4(AsO4)4(OH)2 · 4H2O |
| 4.JN.35 | Eurekadumpite | (Cu,Zn)16(TeO3)2(AsO4)3Cl(OH)18 · 7H2O |
| 4.JN.40 | Tamboite | Fe3+3(OH)(H2O)2(SO4)(Te4+O3)3(Te4+O(OH)2)(H2O)3 |
| 4.JN.40 | Metatamboite | Fe3+3(OH)(H2O)2(SO4)(Te4+O3)3(Te4+O(OH)2)(H2O) |
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 Cesbronite
mindat.org URL:
https://www.mindat.org/min-940.html
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Please feel free to link to this page.
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References for Cesbronite
Reference List:
Fleischer, Michael, Chao, George Y., Mandarino, J. A. (1979) New mineral names. American Mineralogist, 64 (5-6) 652-659
Localities for Cesbronite
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.
Mexico (TL) | |
| Williams (1974) +1 other reference |
USA | |
| Anthony et al. (1995) |
| Mandarino (1996) |
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Bambollita Mine, Moctezuma, Moctezuma Municipality, Sonora, Mexico