Euchroite (original) (raw)

A valid IMA mineral species - grandfathered

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About EuchroiteHide

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Formula:

Cu2(AsO4)(OH) · 3H2O

Colour:

Bright emerald-green, leek-green; bright bluish green in transmitted light.

Crystal System:

Orthorhombic

Name:

Named in 1823 by August Breithaupt from the Greek ευχροια for "beautiful color."

A rare secondary copper arsenate.

Metastable by comparison to related copper arsenates; may be pseudomorphed by olivenite.

In the crystal 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.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:1417:1

d80b5224-f382-4e6d-b036-365cabb71feb

IMA Classification of EuchroiteHide

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Approved, 'Grandfathered' (first described prior to 1959)

Classification of EuchroiteHide

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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

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol Source Reference
Euc 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 EuchroiteHide

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Transparency:

Transparent, Translucent

Colour:

Bright emerald-green, leek-green; bright bluish green in transmitted light.

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

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RI values:

_n_α = 1.695 _n_β = 1.698 _n_γ = 1.733

2V:

Measured: 28° to 30°, Calculated: 34°

δ = 0.038

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Dispersion:

relatively weak

Chemistry of EuchroiteHide

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Mindat Formula:

Cu2(AsO4)(OH) · 3H2O

Crystallography of EuchroiteHide

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Crystal System:

Orthorhombic

Class (H-M):

222 - Disphenoidal

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)

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)

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

d-spacing Intensity
5.34 Å (100)
2.83 Å (90)
7.37 Å (80)
2.64 Å (80)
2.55 Å (70)
3.71 Å (60)
1.510 Å (50)

Comments:

Ľubietová, Slovakia. Data from Berry (1951).

Geological EnvironmentHide

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Type Occurrence of EuchroiteHide

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General Appearance of Type Material:

Crystals lining crevices in mica schist.

Associated Minerals at Type Locality:

Other Language Names for EuchroiteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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8.DC. Césarferreiraite Fe2+ Fe3+2(AsO4)2(OH)2 · 8H2O Tric. 1 : _P_1
8.DC. Ferrivauxite Fe3+Al2(PO4)2(OH)3 · 5H2O Tric. 1 : _P_1
8.DC. Ianbruceite Zn2(AsO4)(OH) · 3H2O Mon. 2/m : _P_21/b
8.DC.05 Nissonite Cu2Mg2(PO4)2(OH)2 · 5H2O Mon. 2/m : _B_2/b
8.DC.10 Legrandite Zn2(AsO4)(OH) · H2O Mon. 2/m : _P_21/b
8.DC.12 Strashimirite Cu8(AsO4)4(OH)4 · 5H2O Mon.
8.DC.15 Earlshannonite Mn2+Fe3+2(PO4)2(OH)2 · 4H2O Mon. 2/m : _P_21/b
8.DC.15 Kunatite CuFe3+2(PO4)2(OH)2 · 4H2O Mon. 2/m : _P_21/b
8.DC.15 UM2006-27-PO:FeHZn ZnFe3+2(PO4)2(OH)2 · 4H2O Mon.
8.DC.15 UKI-2006-(PO:AlCuFeH) Fe2+Al3+2(PO4)2(OH)2 · 4H2O
8.DC.15 Cobaltarthurite CoFe3+2(AsO4)2(OH)2 · 4H2O Mon. 2/m : _P_21/b
8.DC.15 Arthurite CuFe3+2(AsO4)2(OH)2 · 4H2O Mon. 2/m : _P_21/b
8.DC.15 Ojuelaite ZnFe3+2(AsO4)2(OH)2 · 4H2O Mon. 2/m : _P_21/b
8.DC.15 Whitmoreite Fe2+Fe3+2(PO4)2(OH)2 · 4H2O Mon. 2/m : _P_21/b
8.DC.15 Bendadaite Fe2+Fe3+2(AsO4)2(OH)2 · 4H2O Mon. 2/m : _P_21/b
8.DC.17 Kleemanite ZnAl2(PO4)2(OH)2 · 3H2O Mon.
8.DC.20 Magnesiobermanite MgMn3+2(PO4)2(OH)2 · 4H2O Mon. 2 : _P_21
8.DC.20 Bermanite Mn2+Mn3+2(PO4)2(OH)2 · 4H2O Mon. 2/m : _P_2/b
8.DC.20 Coralloite Mn2+Mn3+2(AsO4)2(OH)2 · 4H2O Tric. 1 : _P_1
8.DC.22 Kovdorskite Mg2(PO4)(OH) · 3H2O Mon. 2/m : _P_21/b
8.DC.25 Zincostrunzite ZnFe3+2(PO4)2(OH)2 · 6.5H2O Tric. 1 : _P_1
8.DC.25 Metavauxite Fe2+Al2(PO4)2(OH)2 · 8H2O Mon. 2/m : _P_21/b
8.DC.25 Metavivianite Fe2+Fe3+2(PO4)2(OH)2 · 6H2O Tric. 1 : _P_1
8.DC.25 Ferristrunzite Fe3+Fe3+2(PO4)2(OH)3 · 5H2O Tric.
8.DC.25 Strunzite Mn2+Fe3+2(PO4)2(OH)2 · 6H2O Tric. 1 : _P_1
8.DC.25 Ferrostrunzite Fe2+Fe3+2(PO4)2(OH)2 · 6H2O Tric.
8.DC.27 Beraunite Fe3+6(PO4)4O(OH)4 · 6H2O Mon. m : B b
8.DC.27 Tvrdýite Fe2+Fe3+2 Al3(PO4)4(OH)5(H2O)4 · 2H2O Mon. 2/m : _B_2/b
8.DC.27 Zincoberaunite ZnFe3+5(PO4)4(OH)5 · 6H2O Mon. 2/m : _B_2/b
8.DC.30 Maghrebite MgAl2(AsO4)2(OH)2 · 8H2O Tric. 1 : _P_1
8.DC.30 Ferrolaueite Fe2+Fe3+2(PO4)2(OH)2 · 8H2O Tric. 1 : _P_1
8.DC.30 Ushkovite MgFe3+2(PO4)2(OH)2 · 8H2O Tric. 1 : _P_1
8.DC.30 Laueite Mn2+Fe3+2(PO4)2(OH)2 · 8H2O Tric. 1 : _P_1
8.DC.30 Paravauxite Fe2+Al2(PO4)2(OH)2 · 8H2O Tric. 1 : _P_1
8.DC.30 Sigloite Fe3+Al2(PO4)2(OH)3 · 7H2O Tric. 1 : _P_1
8.DC.30 Nordgauite MnAl2(PO4)2(F,OH)2 · 5H2O Tric. 1 : _P_1
8.DC.30 Kayrobertsonite [MnAl2(PO4)2(OH)2(H2O)4] · 2H2O Tric. 1 : _P_1
8.DC.30 Kummerite Mn2+Fe3+Al(PO4)2(OH)2 · 8H2O Tric. 1 : _P_1
8.DC.30 Mangangordonite Mn2+Al2(PO4)2(OH)2 · 8H2O Tric. 1 : _P_1
8.DC.30 Stewartite Mn2+Fe3+2(PO4)2(OH)2 · 8H2O Tric. 1 : _P_1
8.DC.30 Gordonite MgAl2(PO4)2(OH)2 · 8H2O Tric. 1 : _P_1
8.DC.30 Kastningite (Mn2+,Fe2+,Mg)Al2(PO4)2(OH)2 · 8H2O Tric. 1 : _P_1
8.DC.30 Pseudolaueite Mn2+Fe3+2(PO4)2(OH)2 · 8H2O Mon. 2/m : _P_21/b
8.DC.32 Kamarizaite Fe3+3(AsO4)2(OH)3 · 3H2O Tric. 1 : _P_1
8.DC.32 Tinticite Fe3+3(PO4)2(OH)3 · 3H2O Tric. 1 : _P_1
8.DC.35 Vauxite Fe2+Al2(PO4)2(OH)2 · 6H2O Tric. 1 : _P_1
8.DC.37 Vantasselite Al4(PO4)3(OH)3 · 9H2O Orth.
8.DC.40 Cacoxenite Fe3+24AlO6(PO4)17(OH)12 · 75H2O Hex. 6/m : _P_63/m
8.DC.45 Souzalite (Mg,Fe2+)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O Tric. 1
8.DC.45 Gormanite (Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O Tric.
8.DC.47 Kingite Al3(PO4)2F2(OH) · 7H2O Tric.
8.DC.50 Allanpringite Fe3+3(PO4)2(OH)3 · 5H2O Mon. 2/m : _P_21/m
8.DC.50 Fluorwavellite Al3(PO4)2(OH)2F · 5H2O Orth. m m m _(_2/_m_2/_m_2/m )
8.DC.50 Wavellite Al3(PO4)2(OH,F)3 · 5H2O Orth. m m m _(_2/_m_2/_m_2/m )
8.DC.52 Kribergite Al5(PO4)3(SO4)(OH)4 · 4H2O Tric. 1 : _P_1
8.DC.55 Mapimite Zn2Fe3+3(AsO4)3(OH)4 · 10H2O Mon. m : B m
8.DC.57 Ogdensburgite Ca2Fe3+4(Zn,Mn2+)(AsO4)4(OH)6 · 6H2O Orth. m m m _(_2/_m_2/_m_2/m ) : C m m m
8.DC.60 Cloncurryite Cu0.5(VO)0.5Al2(PO4)2F2 · 5H2O Mon. 2/m : _P_21/b
8.DC.60 Nevadaite (Cu2+,Al,V3+)6Al8(PO4)8F8(OH)2 · 22H2O Orth. m m m _(_2/_m_2/_m_2/m )
8.DC.62 Kenngottite Mn2+3Fe3+4(PO4)4(OH)6(H2O)2 Mon. 2/m : _P_2/b
8.DC.67 Molinelloite Cu(H2O)(OH)V4+O(V5+O4) Tric. 1 : _P_1
8.DC.70 Whitecapsite H16Fe2+5Fe3+14Sb3+6(AsO4)18O16 · 120H2O Hex. 6/m : _P_63/m
8.DC.75 Heimite PbCu2(AsO4)(OH)3 · 2H2O Mon. 2/m
8.DC.80 Lednevite Cu[PO3(OH)] · H2O Mon. 2/m : _P_21/b

Fluorescence of EuchroiteHide

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Other InformationHide

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Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

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References for EuchroiteHide

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Reference List:

**Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York.**pp.934-935

Majzlan, Juraj, Števko, Martin, Dachs, Edgar, Benisek, Artur, Plášil, Jakub, Sejkora, Jiří (2017) Thermodynamics, stability, crystal structure, and phase relations among euchroite, Cu2 (AsO4)(OH)·3H2O, and related minerals. European Journal of Mineralogy, 29 (1) 5-16 doi:10.1127/ejm/2017/0029-2584

Localities for EuchroiteHide

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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

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- 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). 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

Australia
New South Wales Yancowinna Co. Silverton ⓘ Nadbuck Mine Alan Melbourne
South Australia Pastoral Unincorporated Area Boolcoomatta Reserve (Boolcoomata Station) ⓘ Dome Rock Copper Mine Vera Munro-Smith (2006)
Austria
Salzburg Zell am See District Leogang Hütten Schwarzleograben Inschlag Alp ⓘ Magnesite mine Kirchner et al. (2004)
Schwarzleo mining district ⓘ Brunnkendlgraben R.Poeverlein (2016)
ⓘ Daniel adit Kirchner et al. (2004)
ⓘ Johannes adit Neschen (n.d.)
ⓘ Prehistoric dump Poeverlein (2008)
Tyrol Kufstein District Wildschönau Thierbach ⓘ Grassbergjöchl 54 (in German) +1 other reference
ⓘ Adit No. 379 54 (in German) +1 other reference
Landeck District Flirsch ⓘ Flirsch ski hut 58. +1 other reference
Bulgaria
Sofia Province Svoge Municipality Bov ⓘ Zapachitsa Cu deposit Mincheva-Stefanova (1968) +1 other reference
Chile
Antofagasta Antofagasta Province ⓘ Sierra Gorda
Czech Republic
Hradec Králové Region Náchod District Náchod ⓘ Běloves Černý
France
Auvergne-Rhône-Alpes Rhône Villefranche-sur-Saône Chessy ⓘ Chessy copper mines ? Lapis 23 (4)
Germany
Rhineland-Palatinate Altenkirchen Daaden-Herdorf Schutzbach ⓘ Grüneau Mine (Grüne Au Mine; Grünau Mine) Weiß (1990)
Greece
Attica East Attica Lavreotiki ⓘ Lavrion Mining District Kohlberger (1976)
Agios Konstantinos (Kamariza) ⓘ Kamariza mines (Kamareza mines)
Italy
Lombardy Lecco Province Valsassina Introbio ⓘ Camisolo Pass Mine Vergani (2019) +1 other reference
Sardinia South Sardinia Province Guspini ⓘ Montevecchio Mines Preite et al. (2007)
Namibia
Oshikoto Region Tsumeb ⓘ Tsumeb Mine (Ongopolo Mine) Bowell et al. (2018) +1 other reference
Poland
Lower Silesian Voivodeship Karkonosze County Szklarska Poręba Zbójeckie Skały ⓘ Friedrich Wilhelm magnetite–pyrite mine Lis et al. (1986)
Romania
Caraş-Severin County Moldova Nouă ⓘ Moldova Nouă Mine www.minerals-of-the-carpathians
Russia
Sakha Aldan ⓘ Lebedinoe Au Deposit (Nezametnyi Mine) Nenasheva et al. (2011)
Slovakia
Banská Bystrica Region Banská Bystrica District Ľubietová ⓘ Driekyňa Martin Števko
ⓘ Svätodušná deposit (TL) Majzlan et al. (2017)
Poniky ⓘ Farbište Števko et al. (2011)
Spain
Asturias Salas Carlés ⓘ Carlés Mine Calvo et al. (2014)
Switzerland
Glarus Glarus Nord ⓘ Mürtschenalp Stalder et al. (1998)
Chalttal area ⓘ Grosses Chalttal Meisser (1999) +1 other reference
USA
Montana Missoula County Copper Cliff Mining District ⓘ Copper Cliff Mine (Cramer Creek Cu deposit) Lapis 23 (4)
Nevada Eureka County Lynn Mining District ⓘ Blue Star Mine AIME Pacific Southwest Mineral Industry ...
Pershing County Antelope Mining District ⓘ Majuba Hill Mine Holmwood (2023)
New Jersey Sussex County Ogdensburg Sterling Hill ⓘ Sterling Mine Dunn (1995)
Washington Snohomish County Monte Cristo Mining District ⓘ Mystery Mine Anthony et al +2 other references