LIVE REPORT! Gold and Silver Deposits in Colorado Symposium 2017 - last updated 17 minutes ago. Click here to watch.
Help|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery


This page is currently not sponsored. Click here to sponsor this page.
Green to dark ...
Member of:
Named in allusion to its monoCLINic morphology and relationship to Atacamite.
Polymorph of:
Easily confused with the closely related paratacamite.
Note that "anatacamite", originally considered a triclinic dimorph, was later recognised as twinned clinoatacamite and discredited.

Classification of Clinoatacamite


D : Oxyhalides, hydroxyhalides and related double halides
A : With Cu, etc., without Pb
Dana 7th ed.:

Physical Properties of Clinoatacamite

Green to dark greenish-black, greenish-blue.
Green to white.
Hardness (Mohs):

Optical Data of Clinoatacamite

Biaxial (-)
RI values:
nα = 1.830 nβ = 1.850 nγ = 1.880
Measured: 75° , Calculated: 80°
Max Birefringence:
δ = 0.050
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High

Chemical Properties of Clinoatacamite

IMA Formula:
Elements listed in formula:

Crystallography of Clinoatacamite

Crystal System:
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 6.157(2) Å, b = 6.814(3) Å, c = 9.105(5) Å
β = 99.65(4)°
a:b:c = 0.904 : 1 : 1.336
Unit Cell Volume:
V 376.58 ų (Calculated from Unit Cell)
Pseudo-rhombohedral; complex intergrowths/twins.
Very common, on {100}.

Type Occurrence of Clinoatacamite

Relationship of Clinoatacamite to other Species

Member of:
Other Members of Group:
Unnamed (Cu-Zn Chloride Hydroxide)CuZnCl(OH)3
3.DA.20SimonkolleiteZn5Cl2(OH)8 · H2O
3.DA.25ButtgenbachiteCu19(NO3)2(OH)32Cl4 · 2H2O
3.DA.25ConnelliteCu19(SO4)(OH)32Cl4 · 3H2O
3.DA.40AnthonyiteCu(OH,Cl)2 · 3H2O
3.DA.40CalumetiteCu(OH,Cl)2 · 2H2O
3.DA.45KhaidarkaniteNa0.34Cu4Al3(OH)14F3 · 2H2O
3.DA.50BobkingiteCu5Cl2(OH)8 · 2H2O
3.DA.55AvdoniniteK2Cu5(OH)4Cl8 · H2O
3.DA.60DroninoiteNi6Fe32+(OH)16Cl2 · 4H2O

Other Names for Clinoatacamite

Name in Other Languages:

Other Information

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 Clinoatacamite

Reference List:
Grice, J. D. Szymański, J. T., and Jambor, J. L. (1996), The crystal structure of clinoatacamite, a new polymorph of Cu2(OH)3Cl. Canadian Mineralogist: 34: 73-78.

Jambor, J. L., Dutrizac, J. E., Roberts, A. C., Grice, J. D. and Szymański, J. T. (1996): Clinoatacamite, a new polymorph of Cu2(OH)3Cl, and its relationship to paratacamite and "anarakite". Canadian Mineralogist: 34, 61-72.

Mineralogical Record: 27: 463.

Malcharek, T. & Schlüter, J. (2008): The crystal structure of clinoatacamite and the quest for paratacamite. Poster, Annual Meeting of the DMG, Berlin, Germany, September 14-17, 2008; CD with abstracts, Abs. no. 527.

A S Wills and J-Y Henry (2008): On the crystal and magnetic ordering structures of clinoatacamite, γ-Cu2(OD)3Cl, a proposed valence bond solid. J. Phys.: Condens. Matter 20 472206.

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. [as both clinoatacamite and "anatacamite" (later found to be twinned clinoatacamite and discredited)]

Malcherek, T., Mihailova, B., Welch, M.D. (2017): Structural phase transitions of clinoatacamite and the dynamic Jahn–Teller effect. Physics and Chemistry of Minerals 44, 307-321.

Internet Links for Clinoatacamite URL:
Please feel free to link to this page.
The following Clinoatacamite specimens are currently listed for sale on

Localities for Clinoatacamite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Atlantic Ocean
  • Mid-Atlantic Ridge complex
Gablina, I.F., Semkova, T.A., Stepanova, T.V., and Gor'kova, N.V. (2006): Lithology and Mineral Resources 41(1), 27-44.
  • New South Wales
    • Kennedy Co.
      • Goonumbla
A.L. McLean, J.Chapman, J.L. Sharpe and P.A. Williams (2004): The mineralogy of the oxidised zone of the E26 orebody at Northparkes, New South Wales. Australian Journal of Mineralogy 10, 53-57.
  • South Australia
    • Eyre Peninsula
      • Middleback Range
        • Iron Knob
Australian Jour.Min. v.6, no. 1
  • Western Australia
    • Coolgardie Shire
      • Widgiemooltha
Colchester et al., 2007
    • East Pilbara Shire
      • Rudall River District
Downes, P. J., Hope, M., Bevan, A. W. R. and Henry, D. A. (2006): Chalcocite and associated secondary minerals from the Telfer gold mine, Western Australia. Australian Journal of Mineralogy 12, 25-42.
  • Lower Austria
    • Industrieviertel
Kolitsch, U. & Götzinger, M. A. (2013): 1816) Azurit, Cuprit, Klinoatacamit und sekundäres Kupfer in einem Kupfergusskuchen aus dem Stadtgebiet Neunkirchen, Niederösterreich. 129 in Niedermayr, G. et al. (2013): Neue Mineralfunde aus Österreich LXII. Carinthia II, 203./123., 91-146.
  • Antofagasta Region
    • Antofagasta Province
      • Santa Catalina
        • Guanaco (Huanaco)
samples analysed by Jochen Schluter, Gerhard Mohn and Joy Desor
      • Sierra Gorda District
        • Caracoles
analysed material from dr. Jochen Schluter (curator Hamburg mineralogical museum) - Arturo Molina collection
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. [as both clinoatacamite and "anatacamite" (later found to be twinned clinoatacamite and discredited)]
    • El Loa Province
      • Calama
        • Chuquicamata District
Canadian Mineralogist (1996): 34: 61-72; Mineralogical Record: 27: 463.
    • Tocopilla Province
C. Ruiz Fuller/F. Peebles (1988): "Yacimientos metalíferos de Chile": Fondecyt, Stgo de Chile.
  • Arica and Parinacota Region
    • Arica Province
      • Caleta Vítor district
Samples analysed by Dr. Jochen Schluter (Hamburg University), Germany.
  • Atacama Region
    • Chañaral Province
      • El Salado
samples were analysed by Robert Jenkins at Arizona State University
    • Copiapó Province
samples analysed by Gerhard Moehn
  • Tarapacá Region
    • El Tamarugal Province
      • Salar Grande
Samples analysed as "anatacamite" (later found to be twinned clinoatacamite) by Anthony Kampf, Curator Emeritus of Mineral Sciences at NHM of LAC, California
  • Xinjiang Autonomous Region
    • Tulufan Prefecture (Turfan Prefecture; Turpan Prefecture)
      • Shanshan Co. (Piqan Co.; Pichan Co.)
        • Kanggur-Xifengshan gold belt
Kaiyin Bai and Zhaoxin Han (2007): Northwestern Geology 40(2), 114-117
  • Saxony-Anhalt
    • Stassfurt Potash Deposit
  • Schleswig-Holstein
    • Helgoland Island
Markus Gerstmann collection (SXRD-analysed by Uwe Kolitsch)
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District Mines
        • Agios Konstantinos [St Constantine] (Kamariza)
          • Kamariza Mines (Kamareza Mines)
            • Hilarion area
J. Gröbner und U. Kolitsch (2002): Neufunde von Laurion aus den Jahren 2001 und 2002. Aufschluss 53 (5-6), 363-371.
        • Lavrion (Laurion; Laurium)
Möckel, S. (2000): Strashimirit und 11 weitere Neubestimmungen aus Lavrion (GR). Lapis 25 (7-8), 74.
      • Lavrion District slag localities
        • Agios Nikolaos [St Nicholas] area
Kolitsch, U., Rieck, B., Brandstätter, F., Schreiber, F., Fabritz, K. H., Blaß, G. & Gröbner, J. (2014): Neufunde aus dem altem Bergbau und den Schlacken von Lavrion (II). Mineralien-Welt 25 (2), 82-95 (in German).
  • Esfahan Province (Isfahan Province; Aspadana Province)
    • Nain County (Nayin County)
      • Anarak District
Jambor, J.L. et al. (1996). "Clinoatacamite a new polymorph of Cu2(OH)3Cl and its relationship to paratactamite and "anarakite"." Canadian Mineralogist, 34,pp:61-72.
  • Co. Waterford
    • Bonmahon (Bunmahon)
      • Knockmahon
Braithwaite, R.S.W. & Wilson, J.I. (2001) J. Russell Soc., 7(2), p.96.
  • Tuscany
    • Livorno Province
      • Elba Island
        • Capoliveri
          • Cape Calamita Mine (Calamita Mine)
P. Rögner, M. Hanauer, F. Senesi (2000) - Elba orientale: nuovi ritrovamenti - Riv. Min. It., 24, 2: 102-109.
  • Sonora
    • Mun. de Santa Cruz
      • Cuitaca
Peter Megaw collection, Marcus Origlieri analysis
Papua New Guinea
  • New Ireland Province
    • Lihir Island area
A.D. Renno, L. Franz, T. Witzke, P.M. Herzig (2004) Canadian Mineralogist 42, 1-16
  • Ica Department
    • Pisco Umay
Richard Dale collection
  • Western-Siberian Region
    • Altaiskii Krai
      • Rudnyi Altai
Pekov, I.V., Lykova, I.S. (2011) Rubtsovskoe deposit, - Mineralogical Almanac, Vol. 16, 96 pp (in Rus).
  • Andalusia
    • Almería
      • Cuevas del Almanzora (Cuevas de Vera)
        • Sierra Almagrera
          • Jaroso Ravine
Georges FAVREAU collection
      • Huércal-Overa
        • Cuesta Alta
          • Cerro Minado Mines
VIÑALS, J., FAVREAU, G., and EYTIER C. & J.-R. (2010): Bobkingite, capgaronnite, juanitaite, gerhardtite, reevesite and other rare minerals from Cerro Minado, Huercal-Overa (Almería). Mineral Up, 4, 3, 6-23 Versions simultaneously published in Catalan (Mineralogistes de Catalunya); in Spanish version (Revista de Minerales).
      • Níjar
        • Rodalquilar
          • Cerro de los Guardias
Georges Favreau collection Christiane & Jean-Robert Eytier collection
      • San José
Georges FAVREAU collection
    • Córdoba
      • El Guijo
Calvo, M. (2009). Minerales y Minas de España. Vol III. Halogenuros. Escuela Técnica Superior de Ingenieros de Minas de Madrid. Fundación Gómez Pardo. 267 págs.
  • Aragón
    • Zaragoza
      • Fombuena
Calvo, G., Viñals, J. y Calvo, M. (2008). Presencia de delafossita, gibbsita y cianotriquita en un yacimiento cuprífero del barranco de la Sierra, Fombuena (Zaragoza). Macla, 9, 59-60.
  • Valencian Community
    • Castellón
Mineralogía de la concesión San Rafael, Villahermosa del Río, Castellón, España
        • San Rafael claim
- Cócera, H., Menor-Salván, C. and Muñoz-Alvarado, R. (2010): Mineralogía de la concesión San Rafael, Villahermosa del Río, Castellón, España. Acopios, 1, 1-51. [ ;]
- Cócera, H., Menor-Salván, C. and Muñoz-Alvarado, R. (2010): Mineralogía de la concesión San Rafael, Villahermosa del Río, Castellón, España. Acopios, 1, 1-51. [ ;]
  • England
    • Cornwall
      • St Just District
        • St Just
          • Trewellard
Christine Rust collection
    • Leicestershire
      • Stanton under Bardon
UKJMM 26:31-42
  • Scotland
    • Strathclyde
      • Isle of Islay
[J.Russell Soc. 1998:38]
      • Lochgilphead
[J.Russell Soc. 1998:38]
  • Arizona
    • La Paz Co.
      • Trigo Mts
        • Silver District
XRD-analysed as "anatacamite" (later found to be twinned clinoatacamite) by Dr. Anthony Kampf.
    • Maricopa Co.
      • Big Horn Mts
        • Osborn District
          • Tonopah
            • Belmont Mountain
Raman analyzed at the University of Arizona.
      • Painted Rock Mts
        • Painted Rock District
          • Theba
PXRD analyzed by Tony Kampf; also as "anatacamite" (later found to be twinned clinoatacamite) PXRD analyzed by Tony Kampf; Bruce Murphy Collection
    • Pinal Co.
      • Mammoth District
        • Tiger
          • St. Anthony deposit
Raman analyzed at the University of Arizona.
Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © and the Hudson Institute of Mineralogy 1993-2017, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: July 22, 2017 23:52:37 Page generated: July 18, 2017 18:14:28
Go to top of page