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Eurekadumpite

This page kindly sponsored by Tony Nikischer
Formula:
(Cu,Zn)16(TeO3)2(AsO4)3Cl(OH)18 · 7H2O
Colour:
Bright and deep blue-green to turquoise-coloured
Lustre:
Silky
Hardness:
2½ - 3
Specific Gravity:
3.76
Crystal System:
Monoclinic
Name:
Named after the type locality, the dump of the Centennial Eureka mine.
new structure type


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Classification of EurekadumpiteHide

Approved
Approval Year:
2009
34.8.10.

34 : SELENITES, TELLURITES AND SULFITES
8 : Compound Selenites, Tellurites and Sulfites

Physical Properties of EurekadumpiteHide

Silky
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:
2½ - 3 on Mohs scale
Tenacity:
Flexible
Cleavage:
Perfect
on {010}
Fracture:
Micaceous
Density:
3.76(2) g/cm3 (Measured)    3.826 g/cm3 (Calculated)

Optical Data of EurekadumpiteHide

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 EurekadumpiteHide

Formula:
(Cu,Zn)16(TeO3)2(AsO4)3Cl(OH)18 · 7H2O
IMA Formula:
(Cu,Zn)16(Te4+O3)2(AsO4)3Cl(OH)18 · 7H2O

Crystallography of EurekadumpiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/m
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 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 DiffractionHide

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)

Type Occurrence of EurekadumpiteHide

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:

Synonyms of EurekadumpiteHide

Other Language Names for EurekadumpiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Mcalpineite3 photos of Eurekadumpite associated with Mcalpineite on mindat.org.
Dugganite2 photos of Eurekadumpite associated with Dugganite on mindat.org.
Quartz2 photos of Eurekadumpite associated with Quartz on mindat.org.
Frankhawthorneite2 photos of Eurekadumpite associated with Frankhawthorneite on mindat.org.
Xocomecatlite1 photo of Eurekadumpite associated with Xocomecatlite on mindat.org.
Gold1 photo of Eurekadumpite associated with Gold on mindat.org.

Other InformationHide

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 EurekadumpiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 EurekadumpiteHide

Localities for EurekadumpiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
USA (TL)
 
  • 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 and Joe Marty.
            • Mammoth Peak
Collected by and in the collections of Brent Thorne, Chuck Adan, and Alex Earl. Raman analzyed by Bob Housley.
Mineral and/or Locality  
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