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Trippkeite

Formula:
Cu[As
 
2
O
 
4
]
System:TetragonalColour:Brilliant greenish-blue, ...
Hardness:4
Name:Named after Paul Trippke (1851-1880), Polish mineralogist who discovered the mineral.


Trippkeite Group.

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:Vitreous, Silky
Diaphaneity (Transparency):Translucent
Colour:Brilliant greenish-blue, pistachio-green; pale bluish green in transmitted light
Hardness (Mohs):4
Tenacity:Flexible
Cleavage:Perfect
On {100}, perfect; on {110}, good.
Density (measured):4.8 g/cm3
Density (calculated):4.48 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.

Optical Data of Trippkeite

Type:Uniaxial (+)
RI values: nω = 1.900 nε = 2.120
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

Related to:
  • 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
    (Fe,Pb)As
     
    2
    		O
     
    6
    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

    German names:
    Trippkeit
    Russian names:
    Триппкеит
    Spanish names:
    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.).

    Articles/Blogs about Trippkeite

    Internet Links for Trippkeite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Trippkeite in the Natural History Museum (London) online catalogue
  • Trippkeite details from Handbook of Mineralogy (PDF)
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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
    Google
     
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