Gaudefroyite
A valid IMA mineral species
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About Gaudefroyite
Formula:
Ca4Mn3+2-3(BO3)3(CO3)(O,OH)3
Colour:
Black
Lustre:
Vitreous, Dull
Hardness:
6
Specific Gravity:
3.35 - 3.50
Crystal System:
Hexagonal
Name:
Named in 1964 by Georges Jouravsky and François Permingeat in honor of Christophe-Léon Gaudefroy (1878, Beaucamps-le-Vieux, Somme, France - 1971), French ecclesiastic and mineralogist. He was the professor of mineralogy at the Catholic Institute of Paris for nearly 30 years and also worked at the Sorbonne. After that, he worked for the Geological Survey of Morocco.
Opaque, but transparent in thin slivers.
Unique Identifiers
Mindat ID:
1660
Long-form identifier:
mindat:1:1:1660:1
GUID
(UUID V4):
(UUID V4):
352d9fcd-03fb-4aff-814d-70d5fd1c4d72
IMA Classification of Gaudefroyite
Approved
IMA Formula:
Ca4Mn3+3(BO3)3(CO3)O3
Approval year:
1964
First published:
1964
Classification of Gaudefroyite
6.AB.60
6 : BORATES
A : Monoborates
B : BO3, with additional anions; 1(D) + OH, etc.
6 : BORATES
A : Monoborates
B : BO3, with additional anions; 1(D) + OH, etc.
27.1.2.1
27 : COMPOUND BORATES
1 : Miscellaneous
27 : COMPOUND BORATES
1 : Miscellaneous
10.4.6
10 : Borates with other anions
4 : Borates with carbonate
10 : Borates with other anions
4 : Borates with carbonate
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 |
---|---|---|
Gfy | 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 Gaudefroyite
Vitreous, Dull
Transparency:
Opaque
Comment:
Vitreous to dull
Colour:
Black
Streak:
Brown
Hardness:
6 on Mohs scale
Hardness:
VHN100=840 - Vickers
Tenacity:
Brittle
Cleavage:
Distinct/Good
Prismatic {11.0)
Prismatic {11.0)
Fracture:
Conchoidal
Density:
3.35 - 3.50 g/cm3 (Measured) 3.49(5) g/cm3 (Calculated)
Optical Data of Gaudefroyite
Type:
Uniaxial (+)
RI values:
nω = 1.805 - 1.810 nε = 2.015 - 2.020
Max Birefringence:
δ = 0.210
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
Anisotropism:
Strong, in pale gray
Reflectivity:
Wavelength | R1 | R2 |
---|---|---|
400nm | 11.2% | 15.4% |
440nm | 10.4% | 14.2% |
480nm | 9.9% | 13.4% |
520nm | 9.6% | 12.8% |
560nm | 9.5% | 12.3% |
600nm | 9.4% | 12.1% |
640nm | 9.3% | 11.9% |
680nm | 9.3% | 11.7% |
700nm | 9.3% | 11.7% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 15.4%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Gray
Internal Reflections:
Strong yellow-orange to reddish
Pleochroism:
Strong
Comments:
O = pale yellowish brown; E = red-orange
Chemistry of Gaudefroyite
Mindat Formula:
Ca4Mn3+2-3(BO3)3(CO3)(O,OH)3
Crystallography of Gaudefroyite
Crystal System:
Hexagonal
Cell Parameters:
a = 10.589(1) Å, c = 5.891(1) Å
Ratio:
a:c = 1 : 0.556
Unit Cell V:
572.04 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Hexagonal prisms with pyramidal terminations. (1010), (1120), (2021), (1121), (1011).
Twinning:
None observed in type material
Comment:
Point Group: 6 or 6m.; Space Group: P63 or disordered P63/m
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0006167 | Gaudefroyite | Antao S M, Hassan I (2008) Gaudefroyite, Ca8Mn3+6[(BO3)6(CO3)2O6]: high-temperature crystal structure The Canadian Mineralogist 46 183-193 | 2008 | Wessels mine, Kalahari manganese field, South Africa | 0 | 298 | |
0006168 | Gaudefroyite | Antao S M, Hassan I (2008) Gaudefroyite, Ca8Mn3+6[(BO3)6(CO3)2O6]: high-temperature crystal structure The Canadian Mineralogist 46 183-193 | 2008 | Wessels mine, Kalahari manganese field, South Africa | 0 | 293 | |
0006169 | Gaudefroyite | Antao S M, Hassan I (2008) Gaudefroyite, Ca8Mn3+6[(BO3)6(CO3)2O6]: high-temperature crystal structure The Canadian Mineralogist 46 183-193 | 2008 | Wessels mine, Kalahari manganese field, South Africa | 0 | 293 | |
0006170 | Gaudefroyite | Antao S M, Hassan I (2008) Gaudefroyite, Ca8Mn3+6[(BO3)6(CO3)2O6]: high-temperature crystal structure The Canadian Mineralogist 46 183-193 | 2008 | Wessels mine, Kalahari manganese field, South Africa | 0 | 293 | |
0006171 | Gaudefroyite | Antao S M, Hassan I (2008) Gaudefroyite, Ca8Mn3+6[(BO3)6(CO3)2O6]: high-temperature crystal structure The Canadian Mineralogist 46 183-193 | 2008 | Wessels mine, Kalahari manganese field, South Africa | 0 | 293 | |
0006172 | Gaudefroyite | Antao S M, Hassan I (2008) Gaudefroyite, Ca8Mn3+6[(BO3)6(CO3)2O6]: high-temperature crystal structure The Canadian Mineralogist 46 183-193 | 2008 | Wessels mine, Kalahari manganese field, South Africa | 0 | 293 | |
0006173 | Gaudefroyite | Antao S M, Hassan I (2008) Gaudefroyite, Ca8Mn3+6[(BO3)6(CO3)2O6]: high-temperature crystal structure The Canadian Mineralogist 46 183-193 | 2008 | Wessels mine, Kalahari manganese field, South Africa | 0 | 293 | |
0006174 | Gaudefroyite | Antao S M, Hassan I (2008) Gaudefroyite, Ca8Mn3+6[(BO3)6(CO3)2O6]: high-temperature crystal structure The Canadian Mineralogist 46 183-193 | 2008 | Wessels mine, Kalahari manganese field, South Africa | 0 | 293 | |
0006175 | Gaudefroyite | Antao S M, Hassan I (2008) Gaudefroyite, Ca8Mn3+6[(BO3)6(CO3)2O6]: high-temperature crystal structure The Canadian Mineralogist 46 183-193 | 2008 | Wessels mine, Kalahari manganese field, South Africa | 0 | 293 | |
0006176 | Gaudefroyite | Antao S M, Hassan I (2008) Gaudefroyite, Ca8Mn3+6[(BO3)6(CO3)2O6]: high-temperature crystal structure The Canadian Mineralogist 46 183-193 | 2008 | Wessels mine, Kalahari manganese field, South Africa | 0 | 293 | |
0006177 | Gaudefroyite | Antao S M, Hassan I (2008) Gaudefroyite, Ca8Mn3+6[(BO3)6(CO3)2O6]: high-temperature crystal structure The Canadian Mineralogist 46 183-193 | 2008 | Wessels mine, Kalahari manganese field, South Africa | 0 | 293 | |
0006178 | Gaudefroyite | Antao S M, Hassan I (2008) Gaudefroyite, Ca8Mn3+6[(BO3)6(CO3)2O6]: high-temperature crystal structure The Canadian Mineralogist 46 183-193 | 2008 | Wessels mine, Kalahari manganese field, South Africa | 0 | 293 | |
0006179 | Gaudefroyite | Antao S M, Hassan I (2008) Gaudefroyite, Ca8Mn3+6[(BO3)6(CO3)2O6]: high-temperature crystal structure The Canadian Mineralogist 46 183-193 | 2008 | Wessels mine, Kalahari manganese field, South Africa | 0 | 293 | |
0006635 | Gaudefroyite | Hoffmann C, Armbruster T, Kunz M (1997) Structure refinement of (001) disordered gaudefroyite Ca4Mn3[(BO3)3(CO3)O3]: Jahn-Teller-distortion in edge-sharing chains of MnO6 octahedra European Journal of Mineralogy 9 7-19 | 1997 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
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Radiation - Copper Kα
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.95 Å | (vs) |
2.62 Å | (vs) |
2.46 Å | (vs) |
9.1 Å | (s) |
4.54 Å | (s) |
2.69 Å | (s) |
1.80 Å | (s) |
4.89 Å | (m) |
2.31 Å | (m) |
2.23 Å | (m) |
1.91 Å | (m) |
1.49 Å | (m) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) |
Type Occurrence of Gaudefroyite
General Appearance of Type Material:
Acicular hexagonal prisms up to 5 cm long, with pyramidal terminations.
Place of Conservation of Type Material:
Geological Survey of Morocco, Rabat, Morocco.
Natural History Museum, Paris, France, 165.34.
National School of Mines, Paris, France.
Natural History Museum, Paris, France, 165.34.
National School of Mines, Paris, France.
Geological Setting of Type Material:
Hydrothermal mineral in manganese deposits
Associated Minerals at Type Locality:
Reference:
Jouravsky, G., Permingeat, F. (1964) La gaudefroyite, une nouvelle espèce minérale. Bulletin de la Société Française de Minéralogie et de Cristallographie: 87: 216-229.
Synonyms of Gaudefroyite
Other Language Names for Gaudefroyite
German:Gaudefroyit
Russian:Годефруаит
Simplified Chinese:碳硼锰钙石
Spanish:Gaudefroyita
Traditional Chinese:碳硼錳鈣石
Common Associates
Associated Minerals Based on Photo Data:
113 photos of Gaudefroyite associated with Andradite | Ca3Fe3+2(SiO4)3 |
47 photos of Gaudefroyite associated with Baryte | BaSO4 |
39 photos of Gaudefroyite associated with Hausmannite | Mn2+Mn3+2O4 |
31 photos of Gaudefroyite associated with Ettringite | Ca6Al2(SO4)3(OH)12 · 26H2O |
28 photos of Gaudefroyite associated with Calcite | CaCO3 |
18 photos of Gaudefroyite associated with Hematite | Fe2O3 |
10 photos of Gaudefroyite associated with Oyelite | Ca10Si8B2O29 · 12.5H2O |
8 photos of Gaudefroyite associated with Sturmanite | Ca6Fe3+2(SO4)2.5[B(OH)4](OH)12 · 25H2O |
6 photos of Gaudefroyite associated with Thaumasite | Ca3(SO4)[Si(OH)6](CO3) · 12H2O |
6 photos of Gaudefroyite associated with Manganite | Mn3+O(OH) |
Related Minerals - Strunz-mindat Grouping
6.AB. | Rhabdoborite-(Mo) | Mg12Mo6+1.33O6(BO3)6F2 |
6.AB. | Chubarovite | KZn2(BO3)Cl2 |
6.AB. | Savelievaite | Mg2Cr3+O2(BO3) |
6.AB.05 | Hambergite | Be2(BO3)(OH) |
6.AB.10 | Berborite | Be2(BO3)(OH,F) · H2O |
6.AB.15 | Jeremejevite | Al6(BO3)5(F,OH)3 |
6.AB.20 | Warwickite | (Mg,Ti,Fe,Al)2O(BO3) |
6.AB.20 | Yuanfuliite | Mg(Fe3+,Al)O(BO3) |
6.AB.25 | Karlite | (Mg,Al)6.5(BO3)3(OH)4(◻,Cl)0.5 |
6.AB.30 | Azoproite | (Mg,Fe2+)2(Fe3+,Ti,Mg)(BO3)O2 |
6.AB.30 | Bonaccordite | Ni2Fe3+(BO3)O2 |
6.AB.30 | Fredrikssonite | Mg2(Mn3+,Fe3+)(BO3)O2 |
6.AB.30 | Ludwigite | Mg2Fe3+(BO3)O2 |
6.AB.30 | Vonsenite | Fe2+2Fe3+(BO3)O2 |
6.AB.30 | Marinaite | Cu2Fe3+O2(BO3) |
6.AB.35 | Pinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 |
6.AB.35 | Folvikite | Sb5+Mn3+(Mg,Mn2+)10O8(BO3)4 |
6.AB.40 | Blatterite | Sb5+3(Mn3+,Fe3+)9(Mn2+,Mg)35(BO3)16O32 |
6.AB.40 | Chestermanite | Mg2(Fe3+,Mn3+,Al,Sb3+)(BO3)O2 |
6.AB.40 | Orthopinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 |
6.AB.40 | Takéuchiite | (Mg,Mn2+)2(Mn3+,Fe3+)(BO3)O2 |
6.AB.45 | Hulsite | (Fe2+,Mg)2(Fe3+,Sn)(BO3)O2 |
6.AB.45 | Magnesiohulsite | (Mg,Fe2+)2(Fe3+,Sn,Mg)(BO3)O2 |
6.AB.45 | Aluminomagnesiohulsite | (Mg,Fe2+)2(Al,Mg,Sn)(BO3)O2 |
6.AB.50 | Fluoborite | Mg3(BO3)(F,OH)3 |
6.AB.50 | Hydroxylborite | Mg3(BO3)(OH)3 |
6.AB.55 | Shabynite | Mg5(BO3)(OH)5(Cl,OH)2 · 4H2O |
6.AB.55 | Wightmanite | Mg5(BO3)O(OH)5 · 2H2O |
6.AB.65 | Sakhaite | Ca48Mg16(BO3)32(CO3)16 · 2(H2O,HCl) |
6.AB.70 | Harkerite | Ca48Mg16[AlSi4O15(OH)]4(BO3)16(CO3)16 · 2(H2O,HCl) |
6.AB.75 | Pertsevite-(F) | Mg2(BO3)(F,OH) |
6.AB.75 | Pertsevite-(OH) | Mg2(BO3)(OH) |
6.AB.80 | Jacquesdietrichite | Cu2(H2BO3)(OH)3 |
6.AB.85 | Painite | CaZrAl9(BO3)O15 |
6.AB.85 | Rhabdoborite-(V) | Mg12(V5+,Mo6+,W6+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x} (x < 1) |
6.AB.85 | Rhabdoborite-(W) | Mg12(W6+,V5+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x} |
6.AB.90 | Mengxianminite | (Ca,Na)2Sn2(Mg,Fe)3Al8[(BO3)(BeO4)O6]2 |
Other Information
IR Spectrum:
Tachgagalt mine material [cm-1]: 1494s, 1219s, 1138, 1110, 937, 878w, 856, 795w, 764, 752w, 735sh, 724s, 663, 621s, 591s, 550sh, 470s, 408w
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 Gaudefroyite
mindat.org URL:
https://www.mindat.org/min-1660.html
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References for Gaudefroyite
Reference List:
Jouravsky, Georges, Permingeat, François (1964) La gaudefroyite, une nouvelle espèce minérale. Bulletin de Minéralogie, 87 (2) 216-229 doi:10.3406/bulmi.1964.5729
Jouravsky, Georges, Permingeat, François (1964) La gaudefroyite, une nouvelle espèce minérale. Bulletin de Minéralogie, 87 (2) 216-229 doi:10.3406/bulmi.1964.5729
Hoffmann, Christina, Armbruster, Thomas, Kunz, Martin (1996) Structure refinement of (001) disordered gaudefroyite Ca4Mn3+3[(BO3)3(CO3)O3]: Jahn-Teller-distortion in edge-sharing chains of Mn3+O6 octahedra. European Journal of Mineralogy, 9 (1) 7-20 doi:10.1127/ejm/9/1/0007
Hassan, Ishmael (2000) Transmission electron microscopy study of gaudefroyite, Ca8Mn63+[(BO3)6(CO3)2O6]. American Mineralogist, 85 (9) 1188-1194 doi:10.2138/am-2000-8-911
Antao, S. M., Hassan, I. (2008) Gaudefroyite, Ca8Mn3+6[(BO3)6(CO3)2O6]: high-temperature crystal structure. The Canadian Mineralogist, 46 (1) 183-193 doi:10.3749/canmin.46.1.183
Localities for Gaudefroyite
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.
Germany | |
| Schäfer (2016) |
Morocco (TL) | |
| Jouravsky et al. (1964) |
South Africa | |
| |
| Von Bezing et al. (1991) |
Cairncross et al. (1995) +2 other references | |
Von Bezing (1991) +1 other reference |
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Wessels Mine, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa