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Eurekadumpite

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Big Photo

Centennial Eureka Mine (Blue Rock), Tintic District, East Tintic Mts, Juab Co., Utah, USA
© Brent Thorne 2010

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Formula:
(Cu,Zn)
 
16
(TeO
 
3
)
 
2
(AsO
 
4
)
 
3
Cl(OH)
 
18
 · 7H
 
2
O
System:MonoclinicColour:Bright and deep ...
Hardness:2½ - 3
Name:Named after the type locality, the dump of the Centennial Eureka mine.


new structure type

Classification of Eurekadumpite

IMA status:Approved 2009
Dana 8th edition ID:34.8.10.

34 : SELENITES, TELLURITES AND SULFITES
8 : Compound Selenites, Tellurites and Sulfites
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Type Occurrence of Eurekadumpite

Type Locality:Centennial Eureka Mine (Blue Rock), Tintic District, East Tintic Mts, Juab Co., Utah, USA
General Appearance of Type Material:Separate compact spherulites (more frequent hemispheres) and rosettes up to 1 mm in diameter.
Place of Conservation of Type Material:Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia (3962/1);
Smithsonian Museum of Natural History, Washington, D.C., USA (174877);
American Museum of Natural History, New York City, USA (112206).
Geological Setting of type material:Polymetallic oxide zone material on mine dump
Associated Minerals at type locality:
QuartzOliveniteMcalpineiteMalachiteGoethite

Physical Properties of Eurekadumpite

Lustre:Silky
Diaphaneity (Transparency):Transparent, Translucent
Comment:Silky on the surface of the aggregates and nacreous on the separate lamellas
Colour:Bright and deep blue-green to turquoise-coloured
Streak:Light turquoise-coloured
Hardness (Mohs):2½ - 3
Tenacity:Flexible
Cleavage:Perfect
on {010}
Fracture:Micaceous
Density (measured):3.76(2) g/cm3
Density (calculated):3.826 g/cm3

Crystallography of Eurekadumpite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P2/m {P1 1 2/m} {P2/m} {P1 2/m 1}
Space Group Setting:P2/m
Cell Parameters:a = 8.28(3) Å, b = 18.97(2) Å, c = 7.38(2) Å
β = 121.3(6)°
Ratio:a:b:c = 0.436 : 1 : 0.389
Unit Cell Volume:V 990 ų
Z:1
Morphology:Pseudohexagonal or rounded lamellas with the main form {010}.
Comment:Space group P2/m, P2 or Pm
X-Ray Powder Diffraction:
d-spacingIntensity
18.92 (100)
9.45 (19)
4.716 (10)
4.111 (13)
3.777 (24)
2.692 (15)
2.524 (41)
1.558 (22)

Optical Data of Eurekadumpite

Type:Biaxial (-)
RI values: nα = 1.690(1) nβ = 1.775(5) nγ = 1.775(5)
2V:Measured: 10° (5)
Maximum Birefringence:δ = 0.085

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Pleochroism:Strong
Comments:X = light turquoise-coloured, Y = Z = deep blue-green

Chemical Properties of Eurekadumpite

Formula:
(Cu,Zn)
 
16
(TeO
 
3
)
 
2
(AsO
 
4
)
 
3
Cl(OH)
 
18
 · 7H
 
2
O
Essential elements:As, Cl, Cu, H, O, Te
All elements listed in formula:As, Cl, Cu, H, O, Te, Zn
Analytical Data:Average of 14 electron-microprobe analyses; water content was determined using the Alimarin method. Sample from the type locality.
FeO (0.04)
CuO (36.07)
ZnO (20.92)
TeO2 (14.02)
As2O5 (14.97)
Cl (1.45)
H2O (13.1)
O=Cl (-0.33)
Total (100.24)
Empirical Formula:
(Cu
 
10.32
Zn
 
5.85
Fe
 
0.01
)(TeO
 
3
)
 
2
(AsO
 
4
)
 
2.97
[Cl
 
0.93
(OH)
 
0.07
](OH)
 
18.45
 · 7.29H
 
2
O

Other Names for Eurekadumpite

Synonyms:
IMA2009-072
Other Languages:

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 Eurekadumpite

Reference List:

- +
Pekov I.V., Chukanov N.V., Zadov A.E., Roberts A.C., Jensen M.C., Zubkova N.V., Nikischer A.J. (2010) Eurekadumpite, (Cu,Zn)16(TeO3)2(AsO4)3Cl(OH)18·7H2O, a new hypergene mineral. Zapiski Rossiyskogo Mineralogicheskogo Obshchestva, 139(4, 26-35 (in Russian). English translation: (2011) Geology of Ore Deposits, 53, 575-582.

Pekov I.V., Jensen M.C., Roberts A.C. and Nikischer A.J. (2010) A New Mineral from an Old Locality: Eurekadumpite Takes Seventeen Years to Characterize. Mineral News, Vol. 26, No. 2, pages 1ff.

Internet Links for Eurekadumpite

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    • Localities for Eurekadumpite

    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.
    USA
     
    • Utah
      • Juab Co.
        • East Tintic Mts
          • Tintic District
    		Pekov I.V., Chukanov N.V., Zadov A.E., Roberts A.C., Jensen M.C., Zubkova N.V., Nikischer A.J. (2010) Eurekadumpite, (Cu,Zn)16(TeO3)2(AsO4)3Cl(OH)18·7H2O, a new supergene mineral // Zapiski RMO, in press.
    Collected by and in the collection of Brent Thorne.
    Marty, J., Kampf, A. R., Housley, R. M., Mills, S. J. & Weiß, S.. (2010). Seltene neue Tellurmineralien aus Kalifornien, Utah, Arizona und New Mexiko (USA). Lapis, 35 (12), 42-51; 66. [p. 49]
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