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Paceite
A valid IMA mineral species
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About Paceite
Formula:
CaCu(CH3COO)4 · 6H2O
Colour:
Dark Blue
Lustre:
Vitreous
Hardness:
1½
Specific Gravity:
1.472 (Calculated)
Crystal System:
Tetragonal
Name:
Named in 2002 by D. E. Hibbs, U. Kolitsch, P. Leverett, J. L. Sharpe, P. A. Williams in honor of Frank L. Pace (1948 - ) of Broken Hill, New South Wales, Australia. Pace is a mineral collector and ex-miner at Broken Hill.
Unique Identifiers
Mindat ID:
10918
Long-form identifier:
mindat:1:1:10918:5
Similar Names
| Aceite | A rock classification type | |
| Pacit | ||
| Pacite | A variety of Löllingite | FeAs2 |
| Paste | A synonym of 'Common Glass' | |
| Piauzite | ||
| Picaite | A valid IMA mineral species | NaCa[AsO3OH][AsO2(OH)2] |
| Picite | A synonym of Delvauxite |
IMA Classification of Paceite
Approved
IMA Formula:
CaCu2+(CH3COO)1-4(H2O)2·4H2O
Approval year:
2001
Classification of Paceite
10.AA.30
10 : ORGANIC COMPOUNDS
A : Salts of organic acids
A : Formates, Acetates, etc.
10 : ORGANIC COMPOUNDS
A : Salts of organic acids
A : Formates, Acetates, etc.
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 |
|---|---|---|
| Pac | 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 Paceite
Vitreous
Transparency:
Translucent
Colour:
Dark Blue
Streak:
Pale blue
Hardness:
1½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{100} and {110}
{100} and {110}
Fracture:
Irregular/Uneven
Density:
1.472 g/cm3 (Calculated)
Optical Data of Paceite
Type:
Uniaxial (+)
RI values:
nω = 1.439(2) nε = 1.482(3)
Max. Birefringence:
δ = 0.043
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 (negative)
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 uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Pleochroism:
Weak
Comments:
O = pale blue with a greenish tint; E = pale blue with a grayish tint.
Chemistry of Paceite
Mindat Formula:
CaCu(CH3COO)4 · 6H2O
Element Weights:
Crystallography of Paceite
Crystal System:
Tetragonal
Class (H-M):
4/m - Dipyramidal
Space Group:
I4/m
Cell Parameters:
a = 11.155(4) Å, c = 16.236(17) Å
Ratio:
a:c = 1 : 1.455
Unit Cell V:
2,020.31 ų (Calculated from Unit Cell)
Z:
4
Morphology:
short prisms
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0009984 | Paceite | Klop E A, Duisenberg A J M, Spek A L (1983) Reinvestigation of the structure of calcium copper acetate hexahydrate, CaCu(C2H3O2)4*6H2O Acta Crystallographica C39 1342-1344 |  | 1983 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.896 Å | (100) |
| 3.530 Å | (20) |
| 5.586 Å | (15) |
| 8.132 Å | (8) |
| 9.297 Å | (6) |
| 2.497 Å | (4) |
| 3.042 Å | (3) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 53 : Other minerals with taphonomic origins | <0.4 |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 55 : Anthropogenic mine minerals |
Type Occurrence of Paceite
Place of Conservation of Type Material:
Broken Hill Geocentre, Broken Hill; Australian Museum, Sydney; Museum of Victoria, Melbourne, Australia, M47465.
Synonyms of Paceite
Other Language Names for Paceite
Related Minerals - Strunz-mindat Grouping
| 10.AA. | Henrysunite | Na2(C2H3O3)2(H2O) |
| 10.AA.05 | Formicaite | Ca(HCOO)2 |
| 10.AA.10 | Dashkovaite | Mg(HCOO)2 · 2H2O |
| 10.AA.20 | Acetamide | CH3CONH2 |
| 10.AA.25 | Calclacite | Ca(CH3COO)Cl · 5H2O |
| 10.AA.35 | Hoganite | Cu(CH3COO)2 · H2O |
| 10.AA.40 | Lianbinite | (NH4)(C2H3O3)(C2H4O3) |
| 10.AA.40 | Domitrovicite | Zn(C2H3O3)2 · 2H2O |
| 10.AA.40 | Puschridgeite | Mn(C2H3O3)2(H2O)2 |
| 10.AA.40 | Lazaraskeite | Cu(C2H3O3)2 |
| 10.AA.40 | Glecklerite | Na(C2H3O3) |
| 10.AA.40 | Jimkrieghite | Ca(C2H3O3)2 |
| 10.AA.40 | Stanevansite | Mg(C2H3O3)2 · 2H2O |
| 10.AA.40 | Rasmussenite | Ca(C2H3O3)2 · 3H2O |
| 10.AA.45 | Marchettiite | C5H7N5O3 |
Other Information
Thermal Behaviour:
Three major mass loss steps at ~120, 400 and 600 °C were found.
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 Paceite
mindat.org URL:
https://www.mindat.org/min-10918.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Paceite
Localities for Paceite
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.
Australia (TL) | |
| Hibbs et al. (2002) |
Quick NavTopAbout PaceiteUnique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesStrunz-MindatOther InformationInternet Links References Localities Locality List
Perilya Potosi Mine, Broken Hill, Broken Hill district, Yancowinna Co., New South Wales, Australia