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Trippkeite
A valid IMA mineral species - grandfathered
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About Trippkeite
Formula:
Cu2+As3+2O4
Colour:
Brilliant greenish-blue, pistachio-green; pale bluish green in transmitted light; with neon-blue internal reflections.
Lustre:
Waxy, Greasy, Pearly
Hardness:
4
Specific Gravity:
4.8
Crystal System:
Tetragonal
Member of:
Name:
Named after Dr. Paul Trippke (1851- June 16, 1880), Polish petrologist of University of Breslau who discovered the mineral.
Type Locality:
Isostructural with:
Blue crystalline-appearing aggregates with rare crystals. Bright pearly neon-blue internal reflections on cleavages.
Unique Identifiers
Mindat ID:
4023
Long-form identifier:
mindat:1:1:4023:1
IMA Classification of Trippkeite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1880
Classification of Trippkeite
4.JA.20
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
A : Arsenites, antimonites, bismuthites; without additional anions, without H2O
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
A : Arsenites, antimonites, bismuthites; without additional anions, without H2O
45.1.5.1
45 : ACID AND NORMAL ANTIMONITES AND ARSENITES
1 : Miscellaneous
45 : ACID AND NORMAL ANTIMONITES AND ARSENITES
1 : Miscellaneous
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 |
|---|---|---|
| Tpk | 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 Trippkeite
Waxy, Greasy, Pearly
Transparency:
Transparent
Comment:
Not adamantine as commonly given. Bright internal reflections.
Colour:
Brilliant greenish-blue, pistachio-green; pale bluish green in transmitted light; with neon-blue internal reflections.
Streak:
Pale blue
Hardness:
4 on Mohs scale
Tenacity:
Flexible
Cleavage:
Perfect
On {100}, perfect; on {110}, good.
On {100}, perfect; on {110}, good.
Fracture:
Micaceous
Density:
4.8 g/cm3 (Measured) 4.49 g/cm3 (Calculated)
Optical Data of Trippkeite
Type:
Uniaxial (+)
RI values:
nω = 1.90 nε = 2.12
Birefringence:
0.22
Max. Birefringence:
δ = 0.220
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 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:
Not Visible
Chemistry of Trippkeite
Mindat Formula:
Cu2+As3+2O4
Element Weights:
Elements listed:
Crystallography of Trippkeite
Crystal System:
Tetragonal
Class (H-M):
4/mmm(4/m2/m2/m) - Ditetragonal Dipyramidal
Space Group:
P42/mbc
Cell Parameters:
a = 8.592 Å, c = 5.573 Å
Ratio:
a:c = 1 : 0.649
Unit Cell V:
411.41 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals short prismatic to equant, exhibiting {021}, {100}, and {001} as dominant forms, plus four additional forms. Crystals may be bent.
Comment:
Space group attribution based on synthetic material.
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
Remove metal-metal sticks
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) |
|---|---|---|---|---|---|---|---|
| 0015632 | Trippkeite | Zemann J (1951) Formel und kristallstruktur des trippkeits Tschermaks Mineralogische und Petrographische Mitteilungen 2 417-423 | 1951 | Copiapo, Chile | 0 | 293 | |
| 0015655 | Trippkeite | Pertlik F (1975) Verfeinerung der kristallstruktur von synthetischem trippkeit, CuAs2O4 Tschermaks Mineralogische und Petrographische Mitteilungen 22 211-217 | 1975 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.07 Å | (60) |
| 3.16 Å | (100) |
| 3.04 Å | (50) |
| 2.72 Å | (40) |
| 2.53 Å | (20) |
| 1.95 Å | (40) |
| 1.64 Å | (30) |
| 1.39 Å | (20) |
Comments:
31-0451
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] |
Type Occurrence of Trippkeite
Place of Conservation of Type Material:
Muséum Nationale d’Histoire Naturelle, Paris, France, number 100.348.
Mineralogisch-Petrographisches Institut und Museum, Bonn, Germany, Tresor des Museums.
Mineralogisch-Petrographisches Institut und Museum, Bonn, Germany, Tresor des Museums.
Geological Setting of Type Material:
Copper deposit
Associated Minerals at Type Locality:
Other Language Names for Trippkeite
Dutch:Trippkeiet
German:Trippkeit
Russian:Триппкеит
Simplified Chinese:软砷铜矿
Spanish:Trippkeita
Traditional Chinese:軟砷銅礦
Relationship of Trippkeite to other Species
Member of:
Other Members of Minium Group:
| Igelströmite | Fe3+(Sb3+Pb2+)O4 | Tet. 4/mmm(4/m2/m2/m) : P42/mbc |
| Manganoschafarzikite | MnSb2O4 | Tet. 4/mmm(4/m2/m2/m) : P42/mbc |
| Minium | Pb3O4 | Tet. 4/mmm(4/m2/m2/m) : P42/mbc |
| Schafarzikite | Fe2+Sb3+2O4 | Tet. 4/mmm(4/m2/m2/m) : P42/mbc |
Roua Mines, Daluis, Nice Arrondissement, Alpes-Maritimes, Provence-Alpes-Côte d'Azur, France