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About EriochalciteHide

CuCl2 · 2H2O
Bluish green, greenish blue, yellowish tint at times.
Specific Gravity:
Crystal System:
From the Greek έριου, wool, and χαλκός, copper, in allusion to the form of aggregation of the original Vesuvius material.
A secondary, water-soluble mineral.

Classification of EriochalciteHide

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

B : Simple halides, with H2O
B : M:X = 1:2

2 : AX2

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
2 : Halides of Cu

Pronounciation of EriochalciteHide

PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of EriochalciteHide

Bluish green, greenish blue, yellowish tint at times.
2½ on Mohs scale
On {110} perfect; on {001} good.
2.47 g/cm3 (Measured)    2.55 g/cm3 (Calculated)

Optical Data of EriochalciteHide

Biaxial (+)
RI values:
nα = 1.646 nβ = 1.685 nγ = 1.745
Measured: 75° , Calculated: 82°
Max Birefringence:
δ = 0.099
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of EriochalciteHide

CuCl2 · 2H2O

Crystallography of EriochalciteHide

Crystal System:
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 7.41 Å, b = 8.09 Å, c = 3.74 Å
a:b:c = 0.916 : 1 : 0.462
Unit Cell V:
224.20 ų (Calculated from Unit Cell)
Lichen-like aggregates of crystals elongated [01]. The center of these aggregates is occupied by small, deeply grooved spire-like cvrystals, often bent or entirely recurved as with gypsum "flowers"; wool-like aggregates.
On {021}, as nearly rectangular penetration twins.
Also given as (Pbmn setting): a = 7.38, b = 8.04, c = 3.72 A.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
5.476 (100)
4.050 (56)
3.093 (40)
2.638 (82)
2.2088 (29)
2.0240 (22)
1.6048 (23)

Type Occurrence of EriochalciteHide

Geological Setting of Type Material:
Active volcanic fumaroles.

Synonyms of EriochalciteHide

Other Language Names for EriochalciteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Klyuchevskite2 photos of Eriochalcite associated with Klyuchevskite on mindat.org.
Chalcocyanite2 photos of Eriochalcite associated with Chalcocyanite on mindat.org.
Bandylite2 photos of Eriochalcite associated with Bandylite on mindat.org.
Belloite1 photo of Eriochalcite associated with Belloite on mindat.org.
Amarantite1 photo of Eriochalcite associated with Amarantite on mindat.org.
Chalcanthite1 photo of Eriochalcite associated with Chalcanthite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

3.BB.10RokühniteFeCl2 · 2H2OMon.
3.BB.15BischofiteMgCl2 · 6H2OMon. 2/m : B2/m
3.BB.20NickelbischofiteNiCl2 · 6H2OMon.
3.BB.25SinjariteCaCl2 · 2H2OTet.
3.BB.30AntarcticiteCaCl2 · 6H2OTrig. 3 2 : P3 2 1
3.BB.35TachyhydriteCaMg2Cl6 · 12H2OTrig.

Related Minerals - Dana Grouping (8th Ed.)Hide

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

8.2.1NantokiteCuClIso. 4 3m : F4 3m
8.2.4AtacamiteCu2(OH)3ClOrth. mmm (2/m 2/m 2/m) : Pnma
8.2.5ParatacamiteCu3(Cu,Zn)(OH)6Cl2Trig. 3m (3 2/m)
8.2.6BotallackiteCu2(OH)3ClMon. 2/m : P21/m
8.2.8CalumetiteCu(OH,Cl)2 · 2H2OOrth.
8.2.9AnthonyiteCu(OH,Cl)2 · 3H2OMon. 2/m
8.2.10ClaringbulliteCu4ClF(OH)6Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
8.2.11MarshiteCuIIso. 4 3m : F4 3m
8.2.12MitscherlichiteK2CuCl4 · 2H2OTet. 4/mmm (4/m 2/m 2/m)

Other InformationHide

Readily soluble in water to a pale blue solution and in NH4OH to an intense blue solution.
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 EriochalciteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Scacchi (1884) Reale accademia delle scienze fisische e matematiche, Naples: 23: 158 (as Eriocalco).
Dana, E.S. (1892) System of Mineralogy, 6th. Edition, New York: 174 (as Erythrocalcite).
Groth, P. (1898) Tabellarische Übersicht der Mineralien nach ihren krystallographish-chemischen Beziehungen. Braunschweig. 4th. edition: 52 (as Erythrochalcit).
Harker (1936) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 93: 136.
Palache, C. and Foshag (1938) American Mineralogist: 23: 85 (as Antofagastite).
Frondel, C. (1950) Mineralogical Magazine: 29: 34.
Palache, Charles, Harry Berman & Clifford Frondel (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Seventh edition, Volume II: 44-46.
Zeitschrift für Kristallographie: 189: 13-15.

Internet Links for EriochalciteHide

Localities for EriochalciteHide

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.
  • South Australia
    • Stuart Shelf
      • Pernatty Lagoon
        • Mount Gunson Copper mines (Pernatty Lagoon - Mount Gunson Cu Deposits)
Noble R.J., Just J. and Johnson J. E., 1983, Catalogue of South Australian Minerals:1983, Government Printer, Adelaide.; Noble R.J., Just J. and Johnson J. E., 1983, Catalogue of South Australian Minerals-1983, Government Printer, Adelaide.
    • Yorke Peninsula
      • Moonta
  • Styria
    • Fischbacher Alpen
      • St. Jakob-Breitenau
        • Hochlantsch
Bojar, H.-P. et al. (1993)
[Clark, 1993 - "Hey's Mineral Index"]
    • Antofagasta Province
      • Sierra Gorda District
Malcherek, T. & Schlüter, J. (2010): Anatacamite from La Vendida mine, Sierra Gorda, Atacama desert, Chile: a triclinic polymorph of Cu2(OH)3Cl. Neues Jahrbuch für Mineralogie - Abhandlungen, 187, 307-312.
    • El Loa Province
      • Calama
        • Chuquicamata District
          • Toki Cu deposit (Toki Cluster)
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: 45; 45, 75, 374.
  • Heves
    • Mátra Mts
      • Recsk
Sánoor Szakáll, Mária Foldvári, Gábor Papp, Péter Kovács-pálffy, Árpád Kovács (1997) Secondary Sulphate Minerals From Hungary. Acta Mineralogica-petrographica, Szeged, Xxxviii, Supplementum, 7-63.
  • Kerman
    • Rafsanjan County
      • Pariz
Khorasanipour, M., Tangestani, M. H., Naseh, R., & Hajmohammadi, H. (2011). Hydrochemistry, mineralogy and chemical fractionation of mine and processing wastes associated with porphyry copper mines: a case study from the Sarcheshmeh mine, SE Iran. Applied Geochemistry, 26(5), 714-730.; Khorasanipour, M. (2015). Environmental mineralogy of Cu-porphyry mine tailings, a case study of semi-arid climate conditions, Sarcheshmeh mine, SE Iran. Journal of Geochemical Exploration, 153, 40-52.
Italy (TL)
  • Campania
    • Naples
      • Somma-Vesuvius Complex
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: 45, 429, 552, 571.
  • Tacna
    • Jorge Basadre Province
Diaby, N., Dold, B., Buselli, E., & Vicetti, R. (2006). EFFECTS ON ELEMENT MOBILITY BY THE CONSTRUCTION OF A WETLAND ON THE MARINE SHORE PORPHYRY COPPER TAILINGS DEPOSIT, BAHÍA DE ITE, PERU. In 7th International Conference on Acid Rock Drainage (ICARD), March (pp. 26-30).
  • Silesian Voivodeship
    • Upper Silesian Coal Basin
      • Rybnik Coal Area
        • Radlin
Ł. Kruszewski PXRD data
  • Kamchatka Krai
Diederik Visser List #39, July 2006
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
        • Northern Breakthrough (North Breach)
          • Second scoria cone
Pekov, I.V., Zubkova, N.V., Yapaskurt, V.O., Lykova, I.S., Belakovskiy, D.I., Vigasina, M.F., Sidorov, E.G., Britvin, S.N., Pushscharovsky, D.Yu. (2015): New zinc and potassium chlorides from fumaroles of the Tolbachik volcano, Kamchatka, Russia: mineral data and crystal chemistry. I. Mellizinkalite, K3Zn2Cl7. European Journal of Mineralogy, 27, 247-253.
  • Arizona
    • Pinal Co.
      • Casa Grande
Grant, Raymond W., Bideaux, R.A., and Williams, S.A. (2006) Minerals Added to the Arizona List 1995-2005: 4.
  • Nevada
    • Mineral Co.
NBMG Spec. Pub. 31 Minerals of Nevada
Mineral and/or Locality  
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