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Gaudefroyite

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Big Photo

Black Rock Mine, Black Rock, Kalahari manganese fields, Northern Cape Province, South Africa
© fabreminerals.com

Show Gaudefroyite Photos (66)



Formula:
Ca
 
4
Mn
3+
2-3
(BO
 
3
)
 
3
(CO
 
3
)(O,OH)
 
3
System:HexagonalHardness:6
Name:
Named after Christophe Gaudefroy (1878-1971), French ecclesiastic and mineralogist.
This page provides mineralogical data about Gaudefroyite.

Classification of Gaudefroyite

IMA status:Approved 1964
Strunz 8th edition ID:5/G.04-100
Nickel-Strunz 10th (pending) edition ID:6.AB.60

6 : BORATES
A : Monoborates
B : BO3, with additional anions; 1(D) + OH, etc.
Dana 8th edition ID:27.1.2.1

27 : COMPOUND BORATES
1 : Miscellaneous
Hey's CIM Ref.:10.4.6

10 : Borates with other anions
4 : Borates with carbonate
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Type Occurrence of Gaudefroyite

Type Locality:Tachgagalt Mine, Ouarzazate Province, Souss-Massa-Draâ Region, Morocco
Year of Discovery:1964

Physical Properties of Gaudefroyite

Hardness (Mohs):6

Crystallography of Gaudefroyite

Crystal System:Hexagonal
Cell Parameters:a = 10.6Å, c = 5.9Å
Ratio:a:c = 1 : 0.557
Unit Cell Volume:V 574.11 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Gaudefroyite

Type:Uniaxial (+)
RI values: nω = 1.805 - 1.810 nε = 2.015 - 2.020
Maximum Birefringence:δ = 0.210

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High

Chemical Properties of Gaudefroyite

Formula:
Ca
 
4
Mn
3+
2-3
(BO
 
3
)
 
3
(CO
 
3
)(O,OH)
 
3
Essential elements:B, C, Ca, Mn, O
All elements listed in formula:B, C, Ca, H, Mn, O

Relationship of Gaudefroyite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
6.AB.05Hambergite
Be
 
2
(BO
 
3
)(OH)
6.AB.10Berborite
Be
 
2
(BO
 
3
)(OH,F) · H
 
2
O
6.AB.15Jeremejevite
Al
 
6
(BO
 
3
)
 
5
(F,OH)
 
3
6.AB.20Warwickite
(Mg,Fe
2+
 
)
 
3
Ti(BO
 
3
)
 
2
O
 
2
6.AB.20Yuanfuliite
Mg(Fe
3+
 
,Fe
2+
 
,Al,Ti,Mg)(BO
 
3
)O
6.AB.25Karlite
Mg
 
7
(BO
 
3
)
 
3
(OH,Cl)
 
5
6.AB.30Azoproite
(Mg,Fe
2+
 
)
 
2
(Fe
3+
 
,Ti,Mg)(BO
 
3
)O
 
2
6.AB.30Bonaccordite
Ni
 
2
Fe
3+
 
(BO
 
3
)O
 
2
6.AB.30Fredrikssonite
Mg
 
2
(Mn
3+
 
,Fe
3+
 
)(BO
 
3
)O
 
2
6.AB.30Ludwigite
Mg
 
2
Fe
3+
 
(BO
 
3
)O
 
2
6.AB.30Vonsenite
Fe
2+
2
Fe
3+
 
(BO
 
3
)O
 
2
6.AB.35Pinakiolite
(Mg,Mn
2+
 
)
 
2
Mn
3+
 
(BO
 
3
)O
 
2
6.AB.40Blatterite
(Mn
2+
 
,Mg)
 
2
(Mn
3+
 
,Sb
3+
 
,Fe
3+
 
)(BO
 
3
)O
 
2
6.AB.40Chestermanite
Mg
 
2
(Fe
3+
 
,Mn
3+
 
,Al,Sb
3+
 
)(BO
 
3
)O
 
2
6.AB.40Orthopinakiolite
(Mg,Mn
2+
 
)
 
2
Mn
3+
 
(BO
 
3
)O
 
2
6.AB.40Takéuchiite
(Mg,Mn
2+
 
)
 
2
(Mn
3+
 
,Fe
3+
 
)(BO
 
3
)O
 
2
6.AB.45Hulsite
(Fe
2+
 
,Mg)
 
2
(Fe
3+
 
,Sn)(BO
 
3
)O
 
2
6.AB.45Magnesiohulsite
(Mg,Fe
2+
 
)
 
2
(Fe
3+
 
,Sn,Mg)(BO
 
3
)O
 
2
6.AB.45Aluminomagnesiohulsite
(Mg,Fe
2+
 
)
 
2
(Al,Mg,Sn)(BO
 
3
)O
 
2
6.AB.50Fluoborite
Mg
 
3
(BO
 
3
)(F,OH)
 
3
6.AB.50Hydroxylborite
Mg
 
3
(BO
 
3
)(OH)
 
3
6.AB.55Shabynite
Mg
 
5
(BO
 
3
)(OH)
 
5
(Cl,OH)
 
2
 · 4H
 
2
O
6.AB.55Wightmanite
Mg
 
5
(BO
 
3
)O(OH)
 
5
 · 2H
 
2
O
6.AB.65Sakhaite
Ca
 
12
Mg
 
4
(BO
 
3
)
 
7
(CO
 
3
)
 
4
(OH)
 
2
Cl
6.AB.70Harkerite
Ca
 
12
Mg
 
4
Al(BO
 
3
)
 
3
(SiO
 
4
)
 
4
(CO
 
3
)
 
5
 · H
 
2
O
6.AB.75Pertsevite-(F)
Mg
 
2
(BO
 
3
)(F,OH)
6.AB.75Pertsevite-(OH)
Mg
 
2
(BO
 
3
)(OH)
6.AB.80Jacquesdietrichite
Cu
 
2
(H
 
2
BO
 
3
)(OH)
 
3
6.AB.85Painite
CaZrAl
 
9
(BO
 
3
)O
 
15
Related Minerals - Hey's Index Grouping:

- +
10.4.1Canavesite
Mg
 
2
(HBO
 
3
)(CO
 
3
) · 5H
 
2
O
10.4.2Carboborite
Ca
 
2
Mg[B(OH)
 
4
]
 
2
(CO
 
3
)
 
2
 · 4H
 
2
O
10.4.3Borcarite
Ca
 
4
Mg(B
 
4
O
 
6
(OH)
 
6
)(CO
 
3
)
 
2
10.4.4Sakhaite
Ca
 
12
Mg
 
4
(BO
 
3
)
 
7
(CO
 
3
)
 
4
(OH)
 
2
Cl
10.4.5Moydite-(Y)
Y[B(OH)
 
4
](CO
 
3
)

Other Names for Gaudefroyite

Synonyms:
IMA1964-006
Other Languages:
German:Gaudefroyit
Russian:Годефруаит
Spanish:Gaudefroyita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Gaudefroyite

Reference List:

- +
American Mineralogy (1965): 50: 806.

Soviet Physics – Crystallography: 20: 87-88.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for Gaudefroyite

Search Engines:
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    • External Links:
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  • Look for Gaudefroyite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Gaudefroyite details from Handbook of Mineralogy (PDF)
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  • Gaudefroyite specimens for sale - minfind.com
  • Fine and rare minerals from mintreasure.com
  • rare and unusual minerals mainly crystallized
  • Find Gaudefroyite on www.crystalclassics.co.uk
  • Fabre Minerals - search for Gaudefroyite specimens
  • Wilensky Fine Minerals
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    • Localities for Gaudefroyite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Morocco
     
    • Souss-Massa-Draâ Region
      • Ouarzazate Province
    		Bull.Soc.fr.Min.Crist. 87 (1964), 216
    South Africa
     
    • Northern Cape Province
      • Kalahari manganese fields
        • Black Rock
    		Rob Lavinsky photo
        • Hotazel
    		Von Bezing, K. L. et al. (1991) The Kalahari manganese field: an update. Mineralogical Record, 22(4), 279-302.
        • Kuruman
          • N'Chwaning Mines
    		Von Bezing, K. L. et al. (1991) The Kalahari manganese field: an update. Mineralogical Record, 22(4), 279-302.
    Minerals of South Africa
    Jesse Crawford
    Mineral and/or Locality
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