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Edwindavisite
A valid IMA mineral species
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About Edwindavisite
Formula:
Cu(C2O4)(NH3)
Colour:
green
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
2.55
Crystal System:
Orthorhombic
Name:
The new mineral name honors Mr. F. Edwin (Ed) Davis, Jr., an Arizona-based mineral collector and the current contractor operator of the Rowley mine, who has gladly accepted the proposed mineral name. Ed Davis graduated from Miami University in Oxford, Ohio, USA, with degrees in chemical engineering, mathematics and chemistry. He is credited for the discovery of the Purple Passion deposit near Wickenburg, Arizona, USA, which is world-renowned among fluorescent mineral collectors.
The first mineral species to combine oxalate anions and ammine ligands.
Yet another copper-ammine -complex-bearing mineral after ammineite and shilovite, chanabayaite, triazolite, and joanneumite.
Known synthetic analogue. Natural counterpart of synthetic catena-μ-oxalato-ammine-copper(II), Cu(C2O4)(NH3).
Yet another copper-ammine -complex-bearing mineral after ammineite and shilovite, chanabayaite, triazolite, and joanneumite.
Known synthetic analogue. Natural counterpart of synthetic catena-μ-oxalato-ammine-copper(II), Cu(C2O4)(NH3).
Unique Identifiers
Mindat ID:
470888
Long-form identifier:
mindat:1:1:470888:5
IMA Classification of Edwindavisite
Approved
IMA Formula:
Cu2+((C2)6+O4)(N3-H3)
Approval year:
2023
Approval history:
IMA No. 2023-056
Classification of Edwindavisite
10.AB.
10 : ORGANIC COMPOUNDS
A : Salts of organic acids
B : Oxalates
10 : ORGANIC COMPOUNDS
A : Salts of organic acids
B : Oxalates
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 |
|---|---|---|
| Ewd | 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 Edwindavisite
Vitreous
Transparency:
Transparent
Colour:
Green
Streak:
Pale green
Hardness:
2 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{100}
{100}
Parting:
none
Density:
2.55(2) g/cm3 (Measured) 2.53 g/cm3 (Calculated)
Optical Data of Edwindavisite
Type:
Biaxial (+)
RI values:
nα = 1.550(2) nβ = 1.559(2) nγ = 1.755(5)
2V:
Measured: 26° (2), Calculated: 2.64°
Max. Birefringence:
δ = 0.205
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:
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.
Dispersion:
dispersion is distinct with r > v.
Pleochroism:
Visible
Comments:
pleochroism is X = light green, Y = pale green, Z = deep green, with Y < X << Z.
Chemistry of Edwindavisite
Mindat Formula:
Cu(C2O4)(NH3)
Element Weights:
Crystallography of Edwindavisite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Space Group:
Pbca
Setting:
Pbca
Cell Parameters:
a = 11.1998(10) Å, b = 9.4307(9) Å, c = 8.3977(7) Å
Ratio:
a:b:c = 1.188 : 1 : 0.89
Unit Cell V:
886.98 ų (Calculated from Unit Cell)
Z:
8
Twinning:
none
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.608 Å | (92) |
| 4.797 Å | (82) |
| 4.679 Å | (59) |
| 3.623 Å | (100) |
| 3.203 Å | (25) |
| 2.467 Å | (29) |
| 2.402 Å | (45) |
| 2.098 Å | (31) |
Type Occurrence of Edwindavisite
General Appearance of Type Material:
occurs as fans or sprays of bladed or prismatic crystals (up to 0.50 x 0.08 x 0.06 mm),
Place of Conservation of Type Material:
collections of (1) the University of Arizona Alfie Norville Gem & Mineral Museum, 115 N Church Ave Ste 121, Tucson, AZ 85701, USA, catalogue no. 22732, the RRUFF Project, deposition no. R230005, and (2) the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue numbers 76287 and 76288 (cotypes)
Geological Setting of Type Material:
The area where the edwindavisite specimens were collected has an unusual bat guano-related, secondary mineral assemblage, from which a number of new mineral species have been discovered. This mine is a former Cu-Pb-Au-Ag-Mo-V-baryte-fluorspar mine that exploited veins presumed to be related to the intrusion of an andesite porphyry dike into Tertiary volcanic rocks.
Associated Minerals at Type Locality:
Other Language Names for Edwindavisite
Dutch:Edwindavisiet
German:Edwindavisit
Related Minerals - Strunz-mindat Grouping
| 10.AB. | Deveroite-(Ce) | Ce2(C2O4)3 · 10H2O |
| 10.AB.X | Falottaite | MnC2O4 · 3H2O |
| 10.AB. | Uroxite | [(UO2)2(C2O4)(OH)2(H2O)2] · H2O |
| 10.AB.05 | Katsarosite | Zn(C2O4) · 2H2O |
| 10.AB.05 | Andreybulakhite | Ni(C2O4) · 2H2O |
| 10.AB.05 | Humboldtine | Fe2+(C2O4) · 2H2O |
| 10.AB.05 | Lindbergite | Mn2+(C2O4) · 2H2O |
| 10.AB.10 | Glushinskite | Mg(C2O4) · 2H2O |
| 10.AB.15 | Moolooite | Cu(C2O4) · nH2O |
| 10.AB.20 | Stepanovite | NaMgFe3+(C2O4)3 · 8-9H2O |
| 10.AB.25 | Minguzzite | K3Fe3+(C2O4)3 · 3H2O |
| 10.AB.30 | Wheatleyite | Na2Cu(C2O4)2 · 2H2O |
| 10.AB.35 | Zhemchuzhnikovite | NaMgAl(C2O4)3 · 8H2O |
| 10.AB.40 | Weddellite | Ca(C2O4) · (2.5-x)H2O |
| 10.AB.45 | Whewellite | Ca(C2O4) · H2O |
| 10.AB.47 | Fiemmeite | Cu2(C2O4)(OH)2 · 2H2O |
| 10.AB.50 | Caoxite | Ca(C2O4) · 3H2O |
| 10.AB.50 | Middlebackite | Cu2C2O4(OH)2 |
| 10.AB.52 | Metauroxite | (UO2)2(C2O4)(OH)2(H2O)2 |
| 10.AB.55 | Oxammite | (NH4)2(C2O4) · H2O |
| 10.AB.60 | Natroxalate | Na2(C2O4) |
| 10.AB.60 | Phoxite | (NH4)2Mg2(C2O4)(PO3OH)2(H2O)4 |
| 10.AB.60 | Carboferriphoxite | [(NH4)K(H2CO3)][Fe3+(HPO4)(H2PO4)(C2O4)] |
| 10.AB.60 | Ferriphoxite | [(NH4)2K(H2O)][Fe3+(HPO4)2(C2O4)] |
| 10.AB.65 | Coskrenite-(Ce) | Ce2(SO4)2(C2O4) · 8H2O |
| 10.AB.70 | Levinsonite-(Y) | (Y,Nd,La)Al(C2O4)(SO4)2 · 12H2O |
| 10.AB.75 | Zugshunstite-(Ce) | (Ce,Nd,La)Al(C2O4)(SO4)2 · 12H2O |
| 10.AB.80 | Novgorodovaite | Ca2(C2O4)Cl2 · 2H2O |
Other Information
Notes:
At room temperature, edwindavisite is insoluble in H2O, but easily soluble in dilute HCl.
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 Edwindavisite
mindat.org URL:
https://www.mindat.org/min-470888.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Edwindavisite
Localities for Edwindavisite
Showing 1 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 (TL) | |
| Bosi et al. (2023) +1 other reference |
125 foot level, Rowley Mine, Theba, Painted Rock Mining District, Painted Rock Mountains, Maricopa County, Arizona, USA