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Eurekadumpite
A valid IMA mineral species
This page kindly sponsored by Tony Nikischer
About Eurekadumpite
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.
Type Locality:
New structure type. Unique combination of elements.
Unique Identifiers
Mindat ID:
39785
Long-form identifier:
mindat:1:1:39785:0
IMA Classification of Eurekadumpite
Approved
IMA Formula:
(Cu2+,Zn2+)16(Te4+O3)2(As5+O4)3Cl(OH)18·7H2O
Approval year:
2009
First published:
2010
Classification of Eurekadumpite
4.JN.35
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
N : Tellurites with additional anions, with H2O
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
N : Tellurites with additional anions, with H2O
34.8.10.
34 : SELENITES, TELLURITES AND SULFITES
8 : Compound Selenites, Tellurites and Sulfites
34 : SELENITES, TELLURITES AND SULFITES
8 : Compound Selenites, Tellurites and Sulfites
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Eur | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Eurekadumpite
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}
on {010}
Fracture:
Micaceous
Density:
3.76(2) g/cm3 (Measured) 3.826 g/cm3 (Calculated)
Optical Data of Eurekadumpite
Type:
Biaxial (-)
RI values:
nα = 1.69(1) nβ = 1.775(5) nγ = 1.775(5)
2V:
Measured: 10° (5)
Max. Birefringence:
δ = 0.085
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Pleochroism:
Strong
Comments:
X = light turquoise-coloured, Y = Z = deep blue-green
Chemistry of Eurekadumpite
Mindat Formula:
(Cu,Zn)16(TeO3)2(AsO4)3Cl(OH)18 · 7H2O
Element Weights:
Crystallography of Eurekadumpite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/c
Setting:
P2/m
Cell Parameters:
a = 8.28(3) Å, b = 18.97(2) Å, c = 7.38(2) Å
β = 121.3(6)°
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 Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 18.92 Å | (100) |
| 9.45 Å | (19) |
| 4.716 Å | (10) |
| 4.111 Å | (13) |
| 3.777 Å | (24) |
| 2.692 Å | (15) |
| 2.524 Å | (41) |
| 1.558 Å | (22) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] | |
| 47e : [Vanadates, chromates, manganates] | |
| 47g : [Halogen-bearing surface weathering minerals] |
Type Occurrence of Eurekadumpite
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).
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 Eurekadumpite
Other Language Names for Eurekadumpite
Dutch:Eurekadumpiet
German:Eurekadumpit
Common Associates
Associations Based on Photo Data:
| 46 photos of Eurekadumpite associated with Quartz | SiO2 |
| 16 photos of Eurekadumpite associated with Mcalpineite | Cu3(Te6+O6) |
| 9 photos of Eurekadumpite associated with Leisingite | Cu2MgTe6+O6 · 6H2O |
| 8 photos of Eurekadumpite associated with Malachite | Cu2(CO3)(OH)2 |
| 7 photos of Eurekadumpite associated with Dugganite | Pb3Zn3(AsO4)2(TeO6) |
| 6 photos of Eurekadumpite associated with Xocomecatlite | Cu3(TeO4)(OH)4 |
| 4 photos of Eurekadumpite associated with Quetzalcoatlite | Zn6Cu3(TeO6)2(OH)6 · AgxPbyClx+2y |
| 4 photos of Eurekadumpite associated with Goethite | Fe3+O(OH) |
| 4 photos of Eurekadumpite associated with Zemannite | Mg0.5ZnFe3+(Te4+O3)3 · 4.5H2O |
| 4 photos of Eurekadumpite associated with Zincospiroffite | Zn2Te4+3O8 |
Related Minerals - Strunz-mindat Grouping
| 4.JN. | Tombstoneite | (Ca0.5Pb0.5)Pb3Cu2+6Te6+2O6(Te4+O3)6(Se4+O3)2(SO4)2 · 3H2O |
| 4.JN. | Ozernovskite | Fe3+4(Te4+O4)(Te4+O3)4 · 7H2O |
| 4.JN. | Shenganfuite | PbTe4+3O5(OH)Cl3(H2O) |
| 4.JN.05 | Sonoraite | Fe3+(TeO3)(OH) · H2O |
| 4.JN.10 | Poughite | Fe3+2(TeO3)2(SO4)(H2O)2 · H2O |
| 4.JN.15 | Cesbronite | Cu2+3Te6+O4(OH)4 |
| 4.JN.20 | Eztlite | Pb2+2Fe3+3(Te4+ O3)3(SO4)O2Cl |
| 4.JN.30 | Juabite | CaCu10(TeO3)4(AsO4)4(OH)2 · 4H2O |
| 4.JN.40 | Tamboite | Fe3+3(OH)(H2O)2(SO4)(Te4+O3)3(Te4+O(OH)2)(H2O)3 |
| 4.JN.40 | Metatamboite | Fe3+3(OH)(H2O)2(SO4)(Te4+O3)3(Te4+O(OH)2)(H2O) |
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.
Internet Links for Eurekadumpite
mindat.org URL:
https://www.mindat.org/min-39785.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Eurekadumpite
Localities for Eurekadumpite
Showing 7 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
USA | |
| Collected Jan. 2021 by Michael J. ... |
| Collected Jan. 2021 by Michael J. ... | |
| Collected by and in the collection of ... +1 other reference |
| 66. [p. 49] +1 other reference | |
| Collected by and in the collections of ... | |
| Collected by and in the collection of ... | |
| Pekov et al. (2010) +1 other reference |
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Upper dumps, North Star Mine, Mammoth, Tintic Mining District, East Tintic Mountains, Utah, USA