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Eurekadumpite

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Formula:
(Cu,Zn)16(TeO3)2(AsO4)3Cl(OH)18 · 7H2O
System:
Monoclinic
Colour:
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

Approved 2009
34.8.10.

34 : SELENITES, TELLURITES AND SULFITES
8 : Compound Selenites, Tellurites and Sulfites
mindat.org URL:
http://www.mindat.org/min-39785.html
Please feel free to link to this page.

First Recorded Occurrence of Eurekadumpite

General Appearance of First Recorded Material:
Separate compact spherulites (more frequent hemispheres) and rosettes up to 1 mm in diameter.
Place of Conservation of First Recorded 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 First Recorded Material:
Polymetallic oxide zone material on mine dump
Associated Minerals at First Recorded Locality:

Physical Properties of Eurekadumpite

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:
3.76(2) g/cm3 (Measured)    3.826 g/cm3 (Calculated)

Crystallography of Eurekadumpite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/m
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 Data:
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)
Max Birefringence:
δ = 0.085
Image 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(TeO3)2(AsO4)3Cl(OH)18 · 7H2O
Essential elements:
All elements listed in formula:
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:
(Cu10.32Zn5.85Fe0.01)(TeO3)2(AsO4)2.97[Cl0.93(OH)0.07](OH)18.45 · 7.29H2O

Other Names for Eurekadumpite

Name in Other Languages:

Other Information

Health Risks:
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

Localities for Eurekadumpite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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
          • Eureka
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.
          • Gold Chain Mine
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]
          • Mammoth
Collected by and in the collection of Brent Thorne.
Mineral and/or Locality  
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