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Cu2Mg2(CO3)(OH)6 · 2H2O
3 - 3½
Named in honor of Dr. Eugene Callaghan (1904–1990), Director of the New Mexico Bureau of Mines, Socorro, New Mexico, USA, for his work on magnesite deposits. The mineral both contains magnesium and has a type locality in a magnesium deposit.
This page provides mineralogical data about Callaghanite.

Classification of Callaghanite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"

D : Carbonates with additional anions, with H2O
A : With medium-sized cations

5 : AmBn(XO3)pZqxH2O & with (m+n):p = 4:1

11 : Carbonates
2 : Carbonates of Cu URL:
Please feel free to link to this page.

Type Occurrence of Callaghanite

Year of Discovery:

Physical Properties of Callaghanite

Hardness (Mohs):
3 - 3½

Crystallography of Callaghanite

Crystal System:
Cell Parameters:
a = 8.24Å, b = 11.8Å, c = 10.06Å
β = 107.3°
a:b:c = 0.698 : 1 : 0.853
Unit Cell Volume:
V 933.90 ų (Calculated from Unit Cell)

Optical Data of Callaghanite

Biaxial (-)
RI values:
nα = 1.559 nβ = 1.653 nγ = 1.680
Measured: 55° , Calculated: 52°
Max Birefringence:
δ = 0.121
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
r < v moderate

Chemical Properties of Callaghanite

Cu2Mg2(CO3)(OH)6 · 2H2O
All elements listed in formula:

Relationship of Callaghanite to other Species

5.DA.05DypingiteMg5(CO3)4(OH)2 · 5H2O
5.DA.05GiorgiositeMg5(CO3)4(OH)2 · 5-6H2O
5.DA.05HydromagnesiteMg5(CO3)4(OH)2 · 4H2O
5.DA.05WidgiemoolthaliteNi5(CO3)4(OH)2 · 5H2O
5.DA.05UM1986-10-CO:ClHMgMnZnMg5(Zn,Mn)3(CO3)2(OH,Cl)12 · H2O
5.DA.05UM1987-01-CO:HMgSMg4(CO3)2(OH)2 · 6H2O ?
5.DA.10ArtiniteMg2(CO3)(OH)2 · 3H2O
5.DA.10IndigiriteMg2Al2(CO3)4(OH)2 · 15H2O
5.DA.10ChlorartiniteMg2(CO3)(OH)Cl · 2H2O
5.DA.15OtwayiteNi2(CO3)(OH)2 · H2O
5.DA.15ZaratiteNi3(CO3)(OH)4 · 4H2O
5.DA.20KambaldaiteNaNi4(CO3)3(OH)3 · 3H2O
5.DA.30Claraite(Cu,Zn)3(CO3)(OH)4 · 4H2O
5.DA.35HydroscarbroiteAl14(CO3)3(OH)36 · nH2O
5.DA.35ScarbroiteAl5(CO3)(OH)13 · 5H2O
5.DA.40CaresiteFe42+Al2(OH)12[CO3] · 3H2O
5.DA.40QuintiniteMg4Al2(OH)12[CO3] · 3H2O
5.DA.40CharmariteMn42+Al2(OH)12[CO3] · 3H2O
5.DA.45Stichtite-2HMg6(Cr,Al)2(CO3)(OH)16 · 4H2O
5.DA.45BrugnatelliteMg6Fe3+(CO3)(OH)13 · 4H2O
5.DA.45ChlormagaluminiteMg4Al2(OH)12Cl2 · 3H2O
5.DA.45Hydrotalcite-2HMg6Al2(CO3)(OH)16 · 4H2O
5.DA.45Pyroaurite-2HMg6Fe23+(OH)16(CO3) · 4H2O
5.DA.45ZaccagnaiteZn4Al2(OH)12[CO3] · 3H2O
5.DA.50ComblainiteNi4Co2(OH)12[CO3] · 3H2O
5.DA.50DesautelsiteMg6Mn23+(OH)16[CO3] · 4H2O
5.DA.50HydrotalciteMg6Al2(OH)16[CO3] · 4H2O
5.DA.50Pyroaurite-3RMg6Fe23+(OH)16[CO3] · 4H2O
5.DA.50ReevesiteNi6Fe23+(OH)16(CO3) · 4H2O
5.DA.50StichtiteMg6Cr2(OH)16[CO3] · 4H2O
5.DA.50TakoviteNi6Al2(OH)16[CO3] · 4H2O
5.DA.50UM1998-10-CO:CoHNiCo6Fe2(CO3)(OH)16 · 4H2O ?
5.DA.55CoalingiteMg10Fe23+(OH)24[CO3] · 2H2O
11.2.4ChalconatroniteNa2Cu(CO3)2 · 3H2O

Other Names for Callaghanite

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 Callaghanite

Reference List:
American Mineralogist: 39: 630-635.

American Mineralogist: 58: 551.

Acta Crystallographica: 11: 169-174.

Internet Links for Callaghanite

Localities for Callaghanite

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.
  • Styria
    • Leoben
      • St Stefan ob Leoben
Postl, W. & Moser, B. (1988): Mineralogische Notizen aus der Steiermark. Mitt. Abt. Miner. Landesmuseum Joanneum, 56, 5-47.; R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993); Moser (1986)
  • Tyrol
    • North Tyrol
      • Inn valley
        • Brixlegg - Schwaz area
Kolitsch, U. (2013): 1799) Anglesit, Brochantit, Calcit, Callaghanit, Connellit, Cuprit, Diopsid, Elyit, Forsterit, Kupfer, Lithargit, Magnesiochromit, Malachit, Monohydrocalcit, Phoenicochroit, Rouait und Willemit in Schlacken der Montanwerke Brixlegg, Tirol. Pp. 111-114 in Niedermayr, G. et al. (2013): Neue Mineralfunde aus Österreich LXII. Carinthia II, 203./123., 91-146.
  • Saxony-Anhalt
    • Mansfeld Basin
      • Helbra
H. Knoll; Fundstellen im Mansfelder Land, Interessante Mineralien aus den Schlacken der Kupferschiefer-Verhüttung. MineralienWelt, Jg 19 (2008), Heft 1 (Jan-Feb), pag 36-47.
      • Hettstedt
        • Copper-Silver smelter (Gottesbelohnung smelter) slag locality
Mineralien Welt 15 Jg Heft 2-2004and 19 JgHeft 1 2008,Horst Knoll Erfurt
  • Liguria
    • Genova Province
      • Genova
        • Borzoli
Palenzona, A., Martinelli, A., Castellano, F., Esposito, F., Esposito, M., Odicino, G. (2005): Callaghanite. Terzo ritrovamento assoluto della specie al Monte Ramazzo, Liguria. Rivista Mineralogica Italiana, 3/2005, 193-194. Odicino, G. (2006): La callaghanite di Monte Ramazzo. Paragenesi a confronto. Prie, 2, 31-36.
        • Varenna Valley
Rivista Mineralogica Italiana, 22 (3), 39-41.
  • Nevada
    • Nye Co.
      • Paradise Range
        • Gabbs District
No reference listed
NBMG Spec. Pub. 31 Minerals of Nevada
  • Oklahoma
    • Jackson Co.
      • Creta
Rocks & Min. vol. 72 (1997)
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