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Trippkeite

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Copiapó Province, Atacama Region, Chile
© Van King

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Formula:
Cu[As
 
2
O
 
4
]
System:TetragonalColour:Brilliant greenish-blue, ...
Hardness:4
Name:Named after Dr. Paul Trippke (1851- June 16, 1880), Polish petrologist of University of Breslau who discovered the mineral.
Isostructural with:Trippkeite Group


Blue crystalline-appearing aggregates with rare crystals. Bright pearly Neon-blue internal reflections on cleavages.

Classification of Trippkeite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:4/J.10-30
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:45.1.5.1

45 : ACID AND NORMAL ANTIMONITES AND ARSENITES
1 : Miscellaneous
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Type Occurrence of Trippkeite

Type Locality:Copiapó Province, Atacama Region, Chile
Year of Discovery:1880
Geological Setting of type material:Copper deposit
Associated Minerals at type locality:
OliveniteMalachiteCupriteChalcopyrite

Physical Properties of Trippkeite

Lustre:Waxy, Greasy, Pearly
Diaphaneity (Transparency):Transparent
Comment:Not adamantine as commonly given. Bright internal reflections.
Colour:Brilliant greenish-blue, pistachio-green; pale bluish green in transmitted light
Comment:Neon-blue internal reflections.
Streak:Pale blue
Hardness (Mohs):4
Tenacity:Flexible
Cleavage:Perfect
On {100}, perfect; on {110}, good.
Fracture:Micaceous
Density (measured):4.8 g/cm3
Density (calculated):4.49 g/cm3

Crystallography of Trippkeite

Crystal System:Tetragonal
Class (H-M):4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:P42/mbc {P42/m 21/b 2/c}
Cell Parameters:a = 8.592Å, c = 5.573Å
Ratio:a:c = 1 : 0.649
Unit Cell Volume: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.
X-Ray Powder Diffraction:
d-spacingIntensity
6.07 (60)
3.16 (100)
3.04 (50)
2.72 (40)
2.53 (20)
1.95 (40)
1.64 (30)
Comments:31-0451

Optical Data of Trippkeite

Type:Uniaxial (+)
RI values: nω = 1.900 nε = 2.120
Birefringence:0.22
Maximum Birefringence:δ = 0.220

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Pleochroism:Not Visible

Chemical Properties of Trippkeite

Formula:
Cu[As
 
2
O
 
4
]
Essential elements:As, Cu, O
All elements listed in formula:As, Cu, O

Relationship of Trippkeite to other Species

Member of Group:
Trippkeite Group:
Related Minerals - Nickel-Strunz Grouping):

- +
4.JA.05Leiteite
Zn[As
 
2
O
 
4
]
4.JA.10Reinerite
Zn
 
3
(AsO
 
3
)
 
2
4.JA.15Karibibite
Fe
 
2
As
 
4
O
 
9
4.JA.20Kusachiite
CuBi
 
2
O
 
4
4.JA.20Schafarzikite
Fe
2+
 
Sb
3+
2
O
 
4
4.JA.25Apuanite
Fe
2+
 
Fe
3+
4
Sb
3+
4
O
 
12
S
4.JA.30Versiliaite
Fe
 
2
Fe
 
4
Sb
 
6
O
 
16
S
4.JA.35Schneiderhöhnite
Fe
2+
 
Fe
3+
3
[As
 
5
O
 
13
]
4.JA.40Zimbabweite
(Na,K)
 
2
PbAs
 
4
(Ta,Nb,Ti)
 
4
O
 
18
4.JA.45Ludlockite
PbFe
3+
4
As
3+
10
O
 
22
4.JA.50Paulmooreite
Pb
 
2
[As
 
2
O
 
5
]
4.JA.55Stibivanite
Sb
 
2
VO
 
5
4.JA.60Chadwickite
(UO
 
2
)[HAsO
 
3
]

Other Names for Trippkeite

Other Languages:
German:Trippkeit
Russian:Триппкеит
Spanish:Trippkeita

Other Information

Other Information:Cleavage tends to break the crystals into shreds or fibers parallel to [001], which are easily bent.

Readily soluble in HCl or HNO3.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Trippkeite

Reference List:vom Rath (1880) Berichte Niederrheinische Gesellschaft für Natur und Heilkunde, Bonn: 209.

Damour (1880) Bulletin de la Société française de Minéralogie: 3: 175-180.

Goldschmidt, V. (1891) Index der Krystallformen der Mineralien. 3 volumes: vol. 3, 420p.: 239.

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 145.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 1034.

Zemann, J. (1951) Formel und Kristallstruktur des Trippkeits. Tschermaks Mineral. Petrog. Mitt., 2, 417-423 (in German).

Pertlik, F. (1975) Verfeinerung der Kristallstruktur von synthetischem Trippkeit, CuAs2O4. Tschermaks Mineral. Petrog. Mitt., 22, 211-217 (in German with English abs.).

Pertlik, F. (1977) Zur Synthese von Kristallen von CuAs2O4 (Trippkeit) und Cu2As3O6CH3COO. (Ein Komponente des Farbpigments "Schweinfurter Grün"). Z. Anorg. Allg. Chem., 436, 201–206 (in German with English abs.).

Internet Links for Trippkeite

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  • Raman and XRD data at RRUFF project
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    Localities for Trippkeite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Chile
     
    • Atacama Region
    		Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 1034; Hey's Mineral Index (1993)
    France
     
    • Provence-Alpes-Côte d'Azur
      • Alpes-Maritimes
        • Guillaumes
          • Daluis
    Greece
     
    • Attikí (Attica; Attika) Prefecture
      • Lavrion (Laurion; Laurium) District
        • Lavrion District Mines
          • Plaka
            • Plaka Mines
    		No reference listed
    Mineral and/or Locality
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