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Euchroite

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Formula:
Cu2(AsO4)(OH) · 3H2O
Colour:
Bright emerald-green, leek-green; bright bluish green in transmitted light.
Lustre:
Vitreous
Hardness:
3½ - 4
Specific Gravity:
3.44
Crystal System:
Orthorhombic
Name:
Named in 1823 by August Breithaupt from the Greek ευχροια for "beautiful color."
A rare secondary copper arsenate.

May be pseudomorphed by olivenite.

In the structure there are two symmetrically-independent Cu sites; the CuO6 octahedra are (typically) strongly distorted (Jahn-Teller distortion). As occurs in a single symmetrically independent site. The Cu-bearing octahedra share edges to form chains || [001]. The arsenate tetrahedra link the chains to constitute a framework, stabilized by hydrogen bonds involving OH groups and water molecules. The hydrogen bonding scheme is complex: there are strong two-center ones and bifurcated three-center ones. There are both bent and almost planar Cu-H2O configurations.


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Classification of EuchroiteHide

Approved, 'Grandfathered' (first described prior to 1959)
8.DC.07

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
C : With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
42.6.3.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
6 : A2(XO4)Zq·xH2O
20.1.8

20 : Arsenates (also arsenates with phosphate, but without other anions)
1 : Arsenates of Cu

Physical Properties of EuchroiteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Bright emerald-green, leek-green; bright bluish green in transmitted light.
Hardness:
3½ - 4 on Mohs scale
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
On {101} and {110}, in traces.
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
3.44 g/cm3 (Measured)    3.45 g/cm3 (Calculated)

Optical Data of EuchroiteHide

Type:
Biaxial (+)
RI values:
nα = 1.695 nβ = 1.698 nγ = 1.733
2V:
Measured: 28° to 30°, Calculated: 34°
Max Birefringence:
δ = 0.038
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
relatively weak
Pleochroism:
Weak

Chemical Properties of EuchroiteHide

Formula:
Cu2(AsO4)(OH) · 3H2O
IMA Formula:
Cu2AsO4(OH) · 3H2O

Crystallography of EuchroiteHide

Crystal System:
Orthorhombic
Class (H-M):
2 2 2 - Disphenoidal
Space Group:
P21 21 21
Cell Parameters:
a = 10.035-10.07 Å, b = 10.4-10.52 Å, c = 6.11-6.12 Å
Ratio:
a:b:c = 0.965 : 1 : 0.588
Unit Cell V:
637.66 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals short prismatic [010] to equant; also thick tabular {100}, rare. Faces m s l striated [010]. Crystals normally holohedral in appearance.
Comment:
V=642.27 (material from Krivovichev et al., 2016)

Type Occurrence of EuchroiteHide

General Appearance of Type Material:
Crystals lining crevices in mica schist.
Associated Minerals at Type Locality:

Other Language Names for EuchroiteHide

Aragonese:Euchroite
Catalan:Eucroita
French:Euchroïte
German:Euchroit
Italian:Eucroite
Slovak:Euchroit
Spanish:Euchroita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Azurite20 photos of Euchroite associated with Azurite on mindat.org.
Olivenite8 photos of Euchroite associated with Olivenite on mindat.org.
Cornubite8 photos of Euchroite associated with Cornubite on mindat.org.
Malachite7 photos of Euchroite associated with Malachite on mindat.org.
Parnauite5 photos of Euchroite associated with Parnauite on mindat.org.
Limonite4 photos of Euchroite associated with Limonite on mindat.org.
Chrysocolla3 photos of Euchroite associated with Chrysocolla on mindat.org.
Cornwallite2 photos of Euchroite associated with Cornwallite on mindat.org.
Goethite2 photos of Euchroite associated with Goethite on mindat.org.
Quartz1 photo of Euchroite associated with Quartz on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.DC.05NissoniteCu2Mg2(PO4)2(OH)2 · 5H2OMon.
8.DC.10LegranditeZn2(AsO4)(OH) · H2OMon. 2/m : P21/b
8.DC.12StrashimiriteCu8(AsO4)4(OH)4 · 5H2OMon.
8.DC.15ArthuriteCuFe3+2(AsO4)2(OH)2 · 4H2OMon.
8.DC.15EarlshannoniteMn2+Fe3+2(PO4)2(OH)2 · 4H2OMon.
8.DC.15OjuelaiteZnFe3+2(AsO4)2(OH)2 · 4H2OMon.
8.DC.15WhitmoreiteFe2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15Cobaltarthurite(Co,Mg)Fe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15BendadaiteFe2+Fe3+2(AsO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15KunatiteCuFe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
8.DC.15UKI-2006-(PO:FeHZn)ZnFe3+2(PO4)2(OH)2 · 4H2OMon.
8.DC.15UKI-2006-(PO:AlCuFeH)Fe2+Al3+2(PO4)2(OH)2 · 4H2O
8.DC.17KleemaniteZnAl2(PO4)2(OH)2 · 3H2OMon.
8.DC.20BermaniteMn2+Mn3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P2/b
8.DC.20CoralloiteMn2+Mn3+2(AsO4)2(OH)2 · 4H2OTric. 1 : P1
8.DC.22KovdorskiteMg2(PO4)(OH) · 3H2OMon.
8.DC.25FerristrunziteFe3+Fe3+2(PO4)2(OH)3 · 5H2OTric.
8.DC.25FerrostrunziteFe2+Fe3+2(PO4)2(OH)2 · 6H2OTric.
8.DC.25MetavauxiteFe2+Al2(PO4)2(OH)2 · 8H2OMon. 2/m : P21/b
8.DC.25MetavivianiteFe2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.25StrunziteMn2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.27BerauniteFe2+Fe3+5(PO4)4(OH)5 · 6H2OMon. 2/m : B2/b
8.DC.30GordoniteMgAl2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30LaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30MangangordoniteMn2+Al2(PO4)2(OH)2 · 8H2OTric.
8.DC.30ParavauxiteFe2+Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30PseudolaueiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OMon. 2/m : P21/b
8.DC.30SigloiteFe3+Al2(PO4)2(OH)3 · 7H2OTric.
8.DC.30StewartiteMn2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30UshkoviteMgFe3+2(PO4)2(OH)2 · 8H2OTric.
8.DC.30FerrolaueiteFe2+Fe3+2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30Kastningite(Mn2+,Fe2+,Mg)Al2(PO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30MaghrebiteMgAl2(AsO4)2(OH)2 · 8H2OTric. 1 : P1
8.DC.30NordgauiteMnAl2(PO4)2(F,OH)2 · 5H2OTric. 1 : P1
8.DC.32TinticiteFe3+5.34(PO4)3.62(VO4)0.38(OH)4 · 6.7H2OTric. 1 : P1
8.DC.35VauxiteFe2+Al2(PO4)2(OH)2 · 6H2OTric. 1 : P1
8.DC.37VantasseliteAl4(PO4)3(OH)3 · 9H2OOrth.
8.DC.40CacoxeniteFe3+24Al(PO4)17O6(OH)12 · 17H2OHex. 6/m : P63/m
8.DC.45Gormanite(Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2OTric.
8.DC.45Souzalite(Mg,Fe2+)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2OTric.
8.DC.47KingiteAl3(PO4)2F2(OH) · 7H2OTric.
8.DC.50WavelliteAl3(PO4)2(OH,F)3 · 5H2OOrth. mmm (2/m 2/m 2/m)
8.DC.50AllanpringiteFe3+3(PO4)2(OH)3 · 5H2OMon. 2/m : P21/m
8.DC.52KribergiteAl5(PO4)3(SO4)(OH)4 · 4H2OTric. 1 : P1
8.DC.55MapimiteZn2Fe3+3(AsO4)3(OH)4 · 10H2OMon.
8.DC.57OgdensburgiteCa2Fe3+4(Zn,Mn2+)(AsO4)4(OH)6 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmmm
8.DC.60Nevadaite(Cu2+,Al,V3+)6Al8(PO4)8F8(OH)2 · 22H2OOrth. mmm (2/m 2/m 2/m)
8.DC.60CloncurryiteCu0.5(VO)0.5Al2(PO4)2F2 · 5H2OMon. 2/m : P21/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

20.1.1LammeriteCu3(AsO4)2Mon.
20.1.2OliveniteCu2(AsO4)(OH)Mon. 2/m : P21/m
20.1.3ClinoclaseCu3(AsO4)(OH)3Mon. 2/m : P21/b
20.1.4CornwalliteCu5(AsO4)2(OH)4Mon. 2/m : P21/b
20.1.5CornubiteCu5(AsO4)2(OH)4Tric. 1 : P1
20.1.6Chlorotile (of Frenzel)
20.1.7GeminiteCu(HAsO4) · H2OTric.
20.1.9StrashimiriteCu8(AsO4)4(OH)4 · 5H2OMon.
20.1.10ArhbariteCu2Mg(AsO4)(OH)3Tric. 1 : P1
20.1.11LindackeriteCuCu4(AsO4)2(HAsO4)2 · 9H2OTric. 1 : P1
20.1.12ConichalciteCaCu(AsO4)(OH)Orth. 2 2 2 : P21 21 21
20.1.13LiroconiteCu2Al(AsO4)(OH)4 · 4H2OMon. 2/m
20.1.14CeruleiteCu2Al7(AsO4)4(OH)13 · 11.5H2OTric.
20.1.15ChenevixiteCu2Fe3+2(AsO4)2(OH)4Mon. 2/m : P21/m
20.1.16ArthuriteCuFe3+2(AsO4)2(OH)2 · 4H2OMon.

Fluorescence of EuchroiteHide

Non-fluorescent.

Other InformationHide

Notes:
Soluble in acids.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for EuchroiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Breithaupt, A. (1823) Vollständige Characteristik etc., 1st. ed.: 172, 266.
Haidinger, W. (1825): Ueber den Euchroit, eine neue Mineralspecies. 1. Vorläufige Notiz über dieses Mineral. J. Chem. Phys. (Schweigger), 45, 231-232.
Haidinger (1825) Annalen der Physik, Halle, Leipzig: 5: 165.
Haidinger (1825) Ed. J. Sc.: 2: 133.
Grailich and Lang (1857) Königliche Akademie der Wissenschaften, Vienna, Sitzber.: 27: 47.
Des Cloizeaux (1859): 2: 30.
Dana, J.D. (1868) System of Mineralogy, 5th. Edition, New York: 566.
Church (1895) Mineralogical Magazine: 11: 1.
Goldschmidt, V. (1916) Atlas der Krystallformen. 9 volumes, atlas, and text: vol. 3: 157.
Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 73.
Hintze, Carl (1931) Handbuch der Mineralogie. Berlin and Leipzig. 6 volumes: 1 [4B]: 876.
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.: 934-935.
Giuseppetti, G. (1963): La struttura cristallina dell'Eucroite Cu2(AsO)(OH)*3(H2O). Periodico di Mineralogia – Roma, 131-156.
Finney, J.J. (1966): Refinement of the crystal structure of euchroite, Cu2(AsO4)(OH)·3H2O. Acta Crystallogr 21: 437–440.
Eby, R.K. & Hawthorne, F.C. (1989): Euchroite, a heteropolyhedral framework structure. Acta Crystallographica: C45: 1479-1482.
Papp, G. (2004): History of Minerals, Rocks and Fossil Resins Discovered in the Carpathian Region. Studia Naturale 14, Hungarian Natural History Museum, Budapest, Hungary, 215 pp.
Krivovichev, S.V., Zolotarev, A.A., Pekov, I.V. (2016): Hydrogen bonding system in euchroite, Cu2(AsO4)(OH)(H2O)3: low-temperature crystal-structure refinement and solid-state density functional theory modeling. Mineralogy and Petrology: 110, 877-883.

Internet Links for EuchroiteHide

Localities for EuchroiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia
 
  • New South Wales
    • Yancowinna Co.
      • Silverton
Alan Melbourne
  • South Australia
    • Olary Province
      • Boolcoomatta Reserve (Boolcoomata Station; Boolcoomatta)
Vera Munro-Smith (2006) Cobalt Mineralisation in Selected Australian Deposits. PhD thesis, University of Western Sydney.
Austria
 
  • Salzburg
    • Saalfelden
      • Leogang
        • Hütten
          • Schwarzleograben
            • Inschlag Alp
C.L. Lengauer, G. Giester, E. Kirchner: Mineralogy and Petrology 81:187-201 (2004)
            • Schwarzleo District
R.Poeverlein (2016)
C.L. Lengauer, G. Giester, E. Kirchner: Mineralogy and Petrology 81:187-201 (2004)
peter neschen collection
Poeverlein, R. (2008): Euchroit und seine Begleiter vom prähistorischen Bergbau, Leogang, Österreich. Lapis, 33 (5), 13-22.
  • Tyrol
    • North Tyrol
      • Inn valley
        • Wörgl
          • Wildschönau
            • Thierbach
R. Poeverlein, J. Gröbner & U. Kolitsch (2010): Mineralien und Bergbau vom Graschberg bei Thierbach in der Tiroler Wildschönau. Lapis 35 (3), 35-40; 54 (in German).
R. Poeverlein, J. Gröbner & U. Kolitsch (2010): Mineralien und Bergbau vom Graschberg bei Thierbach in der Tiroler Wildschönau. Lapis 35 (3), 35-40; 54 (in German).
      • Stanz valley
        • Flirsch
J. Gröbner, U. Kolitsch, R. Poeverlein & M. Strasser (2009): Ein ungewöhnliches Fahlerzvorkommen bei der Flirscher Schihütte im Stanzer Tal, Tirol. Lapis 34, 13-19; 58.
Bulgaria
 
  • Sofiya Oblast (Sofia Oblast)
    • Svoge Obshtina
      • Bov
Mincheva-Stefanova, I. (1968): Strashimirite, a new hydrous copper arsenate. Zap. Vses. Mineral. Obshch. 97, 470-477 (in Russian). [Abstract in Am. Mineral. 54 (1969) 1221]; Lapis 23(4), 9 (1998)
Chile
 
  • Antofagasta Region
    • Antofagasta Province
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Hradec Králové Region
      • Náchod (Nachod)
Černý, P., Doubek, Z., Veselovský, F.: Nerosty z Bělovsi u Náchoda – Jiráskova lomu. Minerál, roč. 11, č. 6, s. 406-418.
France
 
  • Auvergne-Rhône-Alpes
    • Rhône
      • Villefranche
        • Chessy-les-Mines
Lapis 23(4), 9 (1998)
Germany
 
  • Rhineland-Palatinate
    • Siegerland
      • Betzdorf
        • Schutzbach
Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
Kohlberger, W. (1976): Minerals of the Laurium Mines, Attica, Greece. Mineralogical Record, 7, 114-125.
        • Agios Konstantinos [St Constantine] (Kamariza)
No reference listed
Italy
 
  • Sardinia
    • Medio Campidano Province
      • Arbus and Guspini municipalities
Preite, D., & Zuanel, A. (2007). Montevecchio: storia, miniere e minerali. Rivista Mineralogica Italiana, 31 (4), 230-246.
Romania
 
  • Caraş-Severin Co.
    • Banat Mts
      • Moldova Nouă-Sasca Cu-Mo ore field
www.minerals-of-the-carpathians,2009
Slovakia
 
  • Banská Bystrica Region
    • Banská Bystrica Co.
      • Ľubietová (Libetbánya; Libethen)
Martin Števko, unpublished-EMPA-WDS and PXRD confirmed
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: 935; Pauliš, P., Ďuďa, R. (2002) Nejzajímavejší mineralogická naletište Slovenska. Kuttna,K.Hora, 136p
      • Poniky
Števko M., Sejkora J., Bačík P., 2011: Mineralogy and origin of supergene mineralization at the Farbište ore occurrence near Poniky, central Slovakia. Journal of Geosciences, 57, 3, 273-298.
Spain
 
  • Asturias
    • Salas
      • Carlés
Calvo, M. & Viñals, J. (2014). Mineralogy of the gold deposit in Carlés, Salas, Asturias, Spain. Mineral Up, 3 (6), 6-32
Switzerland
 
  • Glarus
    • Murg Valley
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 155.
USA
 
  • Montana
    • Missoula Co.
      • Copper Cliff District
Lapis 23(4), 9 (1998)
  • Nevada
    • Eureka Co.
      • Lynn District
AIME Pacific Southwest Mineral Industry Conference 1977
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Ogdensburg
          • Sterling Hill
Dunn(1995):Pt5:667.
  • Washington
    • Snohomish Co.
      • Monte Cristo District
        • Monte Cristo
Anthony et al; 1995, Handbook of mineralogy.; http://www.handbookofmineralogy.org/pdfs/euchroite.pdf
Mineral and/or Locality  
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