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Clarkeite

Big Photo

Bjertnes pegmatite, Krøderen, Buskerud, Norway
© Thomas Witzke

Show Clarkeite Photos (4)
Formula:
(Na,Ca,Pb)
 
2
U
 
2
(O,OH)
 
7
Colour:Dark red-brown, dark ...Hardness:4 - 4½
Name:After Frank Wigglesworth Clarke (1847-1931), American mineral chemist, and former Chief Chemist of the U.S. Geological Survey.
This page provides mineralogical data about Clarkeite.

Classification of Clarkeite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:4/H.05-10
Nickel-Strunz 10th (pending) edition ID:4.GC.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
G : Uranyl Hydroxides
C : With additional cations; with mainly UO2(O,OH)6 hexagonal polyhedra
Dana 8th edition ID:5.4.1.1

5 : OXIDES CONTAINING URANIUM OR THORIUM
4 : AX2O7·xH2O
Hey's CIM Ref.:7.16.32

7 : Oxides and Hydroxides
16 : Oxides of U
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Type Occurrence of Clarkeite

Type Locality:Deer Park No. 2 Mine, Penland, Spruce Pine District, Mitchell Co., North Carolina, USA
Year of Discovery:1931

Physical Properties of Clarkeite

Lustre:Waxy
Diaphaneity (Transparency):Translucent on thin edges
Colour:Dark red-brown, dark brown
Streak:Yellow-brown
Hardness (Mohs):4 - 4½
Fracture:Conchoidal
Density (measured):6.39 g/cm3

Crystallography of Clarkeite

Morphology:Massive, dense.

Optical Data of Clarkeite

Type:Biaxial (-)
RI values: nα = 1.997 nβ = 2.098 nγ = 2.108
2V:Measured: 30° to 50°, Calculated: 32°
Maximum Birefringence:δ = 0.111

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

Chemical Properties of Clarkeite

Formula:
(Na,Ca,Pb)
 
2
U
 
2
(O,OH)
 
7
Essential elements:Na, O, U
All elements listed in formula:Ca, H, Na, O, Pb, U

Relationship of Clarkeite to other Species

Related Minerals - Nickel-Strunz Grouping):
4.GC.10Umohoite
(UO
 
2
)MoO
 
4
·4H
 
2
O
4.GC.15Spriggite
Pb
 
3
[(UO
 
2
)
 
6
|O
 
8
|(OH)
 
2
]·3H
 
2
O
Related Minerals - Hey's Index Grouping:
7.16.1Uraninite
UO
 
2
7.16.2Schoepite
(UO
 
2
)
 
8
O
 
2
(OH)
 
12
 · 12H
 
2
O
7.16.3Paraschoepite
UO
 
3
 · 2H
 
2
O
7.16.4Metaschoepite
UO
 
3
 · 1-2H
 
2
O
7.16.5Metastudtite
UO
 
4
 · 2H
 
2
O
7.16.6Studtite
UO
 
4
 · 4H
 
2
O
7.16.7Ianthinite
U
4+
 
(UO
 
2
)
 
5
O
 
7
 · 10H
 
2
O
7.16.8Compreignacite
K
 
2
(UO
 
2
)
 
6
O
 
4
(OH)
 
6
 · 7H
 
2
O
7.16.9Vandenbrandeite
Cu(UO
 
2
)(OH)
 
4
7.16.10Roubaultite
Cu
 
2
(UO
 
2
)
 
3
(OH)
 
10
 · 5H
 
2
O
7.16.11Becquerelite
Ca(UO
 
2
)
 
6
O
 
4
(OH)
 
6
 · 8H
 
2
O
7.16.12Rameauite
K
 
2
Ca(UO
 
2
)
 
6
(OH)
 
16
 · H
 
2
O
7.16.13Agrinierite
K
 
2
(Ca,Sr)(UO
 
2
)
 
3
O
 
3
(OH)
 
2
 · 5H
 
2
O
7.16.14Protasite
Ba(UO
 
2
)
 
3
O
 
3
(OH)
 
2
 · 3H
 
2
O
7.16.15Billietite
Ba(UO
 
2
)
 
6
O
 
4
(OH)
 
6
 · 4-8H
 
2
O
7.16.16Bauranoite
Ba(UO
 
2
)
 
2
(OH)
 
6
 · 1-2H
 
2
O
7.16.17Metacalciouranoite
(Ca,Ba,Na
 
2
)U
 
2
O
 
7
·2H
 
2
O
7.16.18Calciouranoite
(Ca,Ba,Pb)U
 
2
O
 
7
·5H
 
2
O
7.16.19Orthobrannerite
UTi
 
4
O
 
12
(OH)
 
2
7.16.20Thorutite
(Th,U,Ca)Ti
 
2
(O,OH)
 
6
7.16.21Davidite-(La)
(La,Ce)(Y,U,Fe)(Ti,Fe)
 
20
(O,OH)
 
38
7.16.22Davidite-(Ce)
(Ce,La)(Y,U,Fe)(Ti,Fe)
 
20
(O,OH)
 
38
7.16.23Brannerite
(U
4+
 
,Ca)(Ti,Fe
3+
 
)
 
2
O
 
6
7.16.24Fourmarierite
PbU
 
4
O
 
13
·4H
 
2
O
7.16.25Richetite
PbU
 
4
O
 
13
·4H
 
2
O
7.16.26Curite
Pb
 
3
(UO
 
2
)
 
8
O
 
8
(OH)
 
6
·2H
 
2
O
7.16.27Masuyite
Pb(UO
 
2
)
 
3
O
 
3
(OH)
 
2
 · 3H
 
2
O
7.16.28Vandendriesscheite
PbU
 
7
O
 
22
·12H
 
2
O
7.16.29Metavandendriesscheite
PbU
 
7
O
 
22
·nH
 
2
O n < 12
7.16.30Sayrite
Pb
 
2
(UO
 
2
)
 
5
O
 
6
(OH)
 
2
·4H
 
2
O
7.16.31Wölsendorfite
(Pb,Ca)U
 
2
O
 
7
·2H
 
2
O
7.16.33Uranosphaerite
Bi(UO
 
2
)O
 
2
(OH)

Other Names for Clarkeite

German names:
Clarkeit
Russian names:
Кларкеит
Spanish names:
Clarkeita

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 Clarkeite

Reference List:Ross, Henderson, and Posnjak (1931), American Mineralogist: 16: 213.

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 624-625.

American Mineralogist (1997): 82: 607-619.

Finch, R.J. and R.C. Ewing (1997), Clarkeite: New chemical and structural data: American Mineralogist: 82: 607-619.

Kubatko, Karrie-Ann, Katheryn Helean, Alexandra Navrotsky, and Peter C. Burns (2006), Thermodynamics of uranyl minerals: Enthalpies of formation of uranyl oxide hydrates: American Mineralogist: 91: 658-666.

Internet Links for Clarkeite

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

    Hide Locality List
    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.
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    (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.
    Hungary
     
    • Baranya Co.
      • Mecsek Mts.
    		Koch: Minerals of Hungary, 1985
    Norway
     
    • Aust-Agder
    		A.O. Larsen (1978, pers. com.); Neumann (1985, p. 90).
    • Buskerud
      • Krøderen
    		R. Åmli (1970, pers. com. to R. Kristiansen); Neumann (1985, pp. 89-90).
    • Vest-Agder
      • Lindesnes
        • Vigeland
    		Sverdrup (1960, p. 171); Neumann (1985, p. 89).
    USA
     
    • Maine
      • Oxford Co.
        • Newry
    		King, V. T., 1994, Mineralogy of Maine, Descriptive Mineralogy, v. 1
        • Stoneham
    		King & Foord, 1994. Mineralogy of Maine, V. 1.
    • New Hampshire
      • Grafton Co.
        • Grafton
    		No reference listed
        • Groton
    		Whitmore & Lawrence, 2004. The Pegmatite Mines Known As Palermo, p.95.
      • Rockingham Co.
        • Raymond
    		No reference listed
    • North Carolina
      • Mitchell Co.
    		Rocks and Minerals, Sep-Oct,2004
    Rocks and Minerals,Sep-Oct,2004
        • Spruce Pine District
          • Penland
          • Spruce Pine
            • Greasy Creek Township
    		Rocks and Minerals,Sep-Oct,2004
    www.excaliburmineral.com
    Rocks and Minerals,Sep-Oct,2004
      • Yancey Co.
        • Spruce Pine District
          • Celo
            • Micaville
    		U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    Mineral and/or Locality
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