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Despujolsite

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Big Photo

N'Chwaning III Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
© Rob Lavinsky

Show Despujolsite Photos (34)



Formula:
Ca
 
3
Mn
4+
 
(SO
 
4
)
 
2
(OH)
 
6
 · 3H
 
2
O
System:HexagonalHardness:2½
Member of:Fleischerite Group
Name:In honour of Pierre Despujols (1888–?), founder of the Moroccan Geologic Survey.


Fleischerite Group.

Classification of Despujolsite

IMA status:Approved
Strunz 8th edition ID:6/D.11-10
Nickel-Strunz 10th (pending) edition ID:7.DF.25

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
F : With large and medium-sized cations
Dana 8th edition ID:31.7.6.1

31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
7 : (AB)2(XO4)Zq·xH2O
Hey's CIM Ref.:25.9.6

25 : Sulphates
9 : Sulphates of Mn
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Type Occurrence of Despujolsite

Type Locality:Tachgagalt Mine, Ouarzazate Province, Souss-Massa-Draâ Region, Morocco
Year of Discovery:1968

Physical Properties of Despujolsite

Hardness (Mohs):2½

Crystallography of Despujolsite

Crystal System:Hexagonal
Class (H-M):6 m2 - Ditrigonal Dipyramidal
Space Group:P62c
Cell Parameters:a = 8.5405(5) Å, c = 10.8094(9) Å
Ratio:a:c = 1 : 1.266
Unit Cell Volume:V 682.81 ų
Z:2

Optical Data of Despujolsite

Type:Uniaxial (+)
RI values: nω = 1.656 nε = 1.682
Maximum Birefringence:δ = 0.026

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

Chemical Properties of Despujolsite

Formula:
Ca
 
3
Mn
4+
 
(SO
 
4
)
 
2
(OH)
 
6
 · 3H
 
2
O
Essential elements:Ca, H, Mn, O, S
All elements listed in formula:Ca, H, Mn, O, S

Relationship of Despujolsite to other Species

Member of:Fleischerite Group
Other Members of Group:

- +
Fleischerite
Pb
 
3
Ge(SO
 
4
)
 
2
(OH)
 
6
 · 3H
 
2
O
Mallestigite
Pb
 
3
Sb
5+
 
(SO
 
4
)(AsO
 
4
)(OH)
 
6
 · 3H
 
2
O
Schaurteite
Ca
 
3
Ge(SO
 
4
)
 
2
(OH)
 
6
 · 4H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
7.DF.05Uklonskovite
NaMg(SO
 
4
)F · 2H
 
2
O
7.DF.10Kainite
KMg(SO
 
4
)Cl · 3H
 
2
O
7.DF.15Natrochalcite
NaCu
 
2
(SO
 
4
)
 
2
(OH) · 2H
 
2
O
7.DF.20Metasideronatrite
Na
 
4
Fe
 
2
(SO
 
4
)
 
4
(OH)
 
2
 · 2H
 
2
O
7.DF.20Sideronatrite
Na
 
2
Fe(SO
 
4
)
 
2
(OH) · 3H
 
2
O
7.DF.25Fleischerite
Pb
 
3
Ge(SO
 
4
)
 
2
(OH)
 
6
 · 3H
 
2
O
7.DF.25Schaurteite
Ca
 
3
Ge(SO
 
4
)
 
2
(OH)
 
6
 · 4H
 
2
O
7.DF.25Mallestigite
Pb
 
3
Sb
5+
 
(SO
 
4
)(AsO
 
4
)(OH)
 
6
 · 3H
 
2
O
7.DF.30Slavíkite
(H
 
3
O
+
 
)
 
3
Mg
 
6
Fe
 
15
(SO
 
4
)
 
21
(OH)
 
18
 · 99H
 
2
O
7.DF.35Metavoltine
Na
 
6
K
 
2
FeFe
 
6
(SO
 
4
)
 
12
O
 
2
 · 18H
 
2
O
7.DF.40Lannonite
HCa
 
4
Mg
 
2
Al
 
4
(SO
 
4
)
 
8
F
 
9
 · 32H
 
2
O
7.DF.40Vlodavetsite
AlCa
 
2
(SO
 
4
)
 
2
F
 
2
Cl · 4H
 
2
O
7.DF.45Peretaite
Ca(SbO)
 
4
(SO
 
4
)
 
2
(OH)
 
2
 · 2H
 
2
O
7.DF.50Gordaite
NaZn
 
4
(SO
 
4
)(OH)
 
6
Cl · 6H
 
2
O
7.DF.55Clairite
(NH
 
4
)
 
2
Fe
 
3
(SO
 
4
)
 
4
(OH)
 
3
 · 3H
 
2
O
7.DF.60Arzrunite
Cu
 
4
Pb
 
2
(SO
 
4
)(OH)
 
4
Cl
 
6
 · 2H
 
2
O (?)
7.DF.65Elyite
Pb
 
4
Cu(SO
 
4
)O
 
2
(OH)
 
4
 · H
 
2
O
7.DF.70Yecoraite
Fe
3+
3
Bi
 
5
(Te
6+
 
O
 
4
)
 
2
(Te
4+
 
O
 
3
)O
 
9
 · 9H
 
2
O
7.DF.75Riomarinaite
Bi(SO
 
4
)(OH) · H
 
2
O
7.DF.80Dukeite
Bi
3+
24
Cr
6+
8
O
 
57
(OH)
 
6
 · 3H
 
2
O
7.DF.85Xocolatlite
Ca
 
2
Mn
4+
2
(Te
6+
 
O
 
6
)
 
2
 · H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
25.9.1Szmikite
MnSO
 
4
 · H
 
2
O
25.9.2Jôkokuite
MnSO
 
4
 · 5H
 
2
O
25.9.3Mallardite
MnSO
 
4
 · 7H
 
2
O
25.9.4Manganolangbeinite
K
 
2
Mn
 
2
(SO
 
4
)
 
3
25.9.5Chvaleticeite
(Mn,Mg)SO
 
4
 · 6H
 
2
O
25.9.7Apjohnite
Mn
2+
 
Al
 
2
(SO
 
4
)
 
4
 · 22H
 
2
O
25.9.8Shigaite
Al
 
4
Mn
 
7
(SO
 
4
)
 
2
(OH)
 
22
 · 8H
 
2
O
25.9.9Ilesite
(Mn,Zn,Fe)SO
 
4
 · 4H
 
2
O
25.9.10Mooreite
(Mg,Zn,Mn
2+
 
)
 
15
(SO
 
4
)
 
2
(OH)
 
26
 · 8H
 
2
O
25.9.11Torreyite
(Mg,Mn
2+
 
)
 
9
Zn
 
4
(SO
 
4
)
 
2
(OH)
 
22
 · 8H
 
2
O
25.9.12Lawsonbauerite
(Mn
2+
 
,Mg)
 
9
Zn
 
4
(SO
 
4
)
 
2
(OH)
 
22
 · 8H
 
2
O
25.9.13Dietrichite
(Zn,Fe
2+
 
,Mn
2+
 
)Al
 
2
(SO
 
4
)
 
4
 · 22H
 
2
O

Other Names for Despujolsite

Synonyms:
IMA1967-039
Other Languages:
German:Despujolsit
Russian:Деспужолсит
Spanish:Despujolsita

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 Despujolsite

Reference List:

- +
American Mineralogist: 54: 326.

Acta Crystallographica: B50: 481-510.

Barkley, M. C., Yang, H., Evans, S. H., Downs, R. T. and Origlieri, M. J. (2011): Redetermination of despujolsite, Ca3Mn4+(SO4)2(OH)6•3H2O. Acta Crystallogr. E67, i47-i48.

Internet Links for Despujolsite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Despujolsite details from Handbook of Mineralogy (PDF)
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    • Localities for Despujolsite

    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.
    Bolivia
     
    • Potosí Department
      • Tomás Frías Province
    		Econ Geol (1997) 92:623-632; Dill, H.G. (1998): Mineralium Deposita 33, 359-378.
    Morocco
     
    • Souss-Massa-Draâ Region
      • Ouarzazate Province
    		Bull.Soc.fr.Min.Crist.(1968) 91, 43-50
    South Africa
     
    • Northern Cape Province
      • Kalahari manganese fields
        • Kuruman
          • N'Chwaning Mines
    		Rob Lavinsky (specimens analyzed by Dr. Robert Downs - University of Arizona)
    USA
     
    • New Mexico
      • Socorro Co.
        • Ojo Caliente No. 2 District
    		NMBGMR Open-file Report - 535
    Mineral and/or Locality
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