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Callaghanite

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About CallaghaniteHide

Eugene "Pat" Callaghan
Formula:
Cu2Mg2(CO3)(OH)6 · 2H2O
Colour:
Azure-blue
Lustre:
Vitreous
Hardness:
3 - 3½
Specific Gravity:
2.71
Crystal System:
Monoclinic
Name:
Named in honor of Dr. Eugene "Pat" Callaghan (1904, Snohomish, Washington, USA – 8 January 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 CallaghaniteHide

Approved, 'Grandfathered' (first described prior to 1959)
First Published:
1954
5.DA.25

5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
A : With medium-sized cations
16b.5.1.1

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
5 : AmBn(XO3)pZqxH2O & with (m+n):p = 4:1
11.2.5

11 : Carbonates
2 : Carbonates of Cu

Pronounciation of CallaghaniteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of CallaghaniteHide

Vitreous
Transparency:
Transparent
Colour:
Azure-blue
Streak:
White
Hardness:
3 - 3½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{111}, {-111}
Fracture:
Irregular/Uneven
Density:
2.71 g/cm3 (Measured)    2.78 g/cm3 (Calculated)

Optical Data of CallaghaniteHide

Type:
Biaxial (-)
RI values:
nα = 1.559 nβ = 1.653 nγ = 1.680
2V:
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:
Moderate
Dispersion:
r < v moderate

Chemical Properties of CallaghaniteHide

Formula:
Cu2Mg2(CO3)(OH)6 · 2H2O

Crystallography of CallaghaniteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 8.24 Å, b = 11.8 Å, c = 10.06 Å
β = 107.3°
Ratio:
a:b:c = 0.698 : 1 : 0.853
Unit Cell V:
933.90 ų (Calculated from Unit Cell)
Morphology:
Pyramidal, showing {111}, {-111}, {221}, {-221}

Type Occurrence of CallaghaniteHide

General Appearance of Type Material:
Small azure-blue crystals disseminated through magnesite and dolomite
Geological Setting of Type Material:
Near peridotite dikes intrusive into magnesite and dolomite.
Reference:
Beck, C.W., Burns, J.H. (1954) Callaghanite, a new mineral. American Mineralogist: 39: 630-635.

Other Language Names for CallaghaniteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Hydromagnesite13 photos of Callaghanite associated with Hydromagnesite on mindat.org.
Mcguinnessite3 photos of Callaghanite associated with Mcguinnessite on mindat.org.
Monohydrocalcite2 photos of Callaghanite associated with Monohydrocalcite on mindat.org.
Magnesite1 photo of Callaghanite associated with Magnesite on mindat.org.
Dolomite1 photo of Callaghanite associated with Dolomite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

5.DA.AlexkhomyakoviteK6(Ca2Na)(CO3)5Cl·6H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mcm
5.DA.05DypingiteMg5(CO3)4(OH)2 · 5H2OMon.
5.DA.05GiorgiositeMg5(CO3)4(OH)2 · 5-6H2O
5.DA.05HydromagnesiteMg5(CO3)4(OH)2 · 4H2OMon.
5.DA.05WidgiemoolthaliteNi5(CO3)4(OH)2 · 5H2OMon.
5.DA.05UM1986-10-CO:ClHMgMnZn (also called Mineral F, Dunn, 1995)Mg5(Zn,Mn)3(CO3)2(OH,Cl)12 · H2O
5.DA.05UM1987-01-CO:HMgSMg4(CO3)2(OH)4 · 6H2O ?Mon.
5.DA.10ArtiniteMg2(CO3)(OH)2 · 3H2OMon.
5.DA.10IndigiriteMg2Al2(CO3)4(OH)2 · 15H2O
5.DA.10ChlorartiniteMg2(CO3)(OH)Cl · 2H2OTrig. 3m : R3c
5.DA.15OtwayiteNi2(CO3)(OH)2 · H2OOrth.
5.DA.15ZaratiteNi3(CO3)(OH)4 · 4H2O ?Iso.
5.DA.20KambaldaiteNaNi4(CO3)3(OH)3 · 3H2OHex.
5.DA.30Claraite(Cu,Zn)15(CO3)4(AsO4)2(SO4)(OH)14·7H2OTric.
5.DA.35HydroscarbroiteAl14(CO3)3(OH)36 · nH2OTric.
5.DA.35ScarbroiteAl5(CO3)(OH)13 · 5H2OHex.
5.DA.40CaresiteFe2+4Al2(OH)12[CO3] · 3H2OTrig.
5.DA.40QuintiniteMg4Al2(OH)12[CO3] · 3H2OHex. 6 2 2 : P63 2 2
5.DA.40CharmariteMn2+4Al2(OH)12[CO3] · 3H2O
5.DA.45Stichtite-2HMg6(Cr,Al)2(CO3)(OH)16 · 4H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
5.DA.45BrugnatelliteMg6Fe3+(CO3)(OH)13 · 4H2OHex.
5.DA.45ChlormagaluminiteMg4Al2(OH)12Cl2 · 3H2OHex.
5.DA.45Hydrotalcite-2HMg6Al2(CO3)(OH)16 · 4H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
5.DA.45Pyroaurite-2HMg6Fe3+2(OH)16(CO3) · 4H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
5.DA.45ZaccagnaiteZn4Al2(OH)12[CO3] · 3H2OHex.
5.DA.50ComblainiteNi4Co2(OH)12[CO3] · 3H2OTrig.
5.DA.50DesautelsiteMg6Mn3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m)
5.DA.50HydrotalciteMg6Al2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
5.DA.50PyroauriteMg6Fe3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
5.DA.50ReevesiteNi6Fe3+2(OH)16(CO3) · 4H2OTrig.
5.DA.50StichtiteMg6Cr3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m) : R3m
5.DA.50TakoviteNi6Al2(OH)16[CO3] · 4H2OTrig.
5.DA.50UM1998-10-CO:CoHNiCo6Fe2(CO3)(OH)16 · 4H2O ?
5.DA.55CoalingiteMg10Fe3+2(OH)24[CO3] · 2H2OTrig.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

11.2.1MalachiteCu2(CO3)(OH)2Mon. 2/m : P21/b
11.2.2AzuriteCu3(CO3)2(OH)2Mon. 2/m : P21/b
11.2.4ChalconatroniteNa2Cu(CO3)2 · 3H2OMon. 2/m

Other InformationHide

Notes:
Effervesces slowly in dilute HCl
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 CallaghaniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Beck, C.W., Burns, J.H. (1954) Callaghanite, a new mineral. American Mineralogist: 39: 630-635.
Fleischer, M. (1955) New mineral names. American Mineralogist: 40: 787-788.
Brunton, G. (1973) Refinement of the callaghanite structure. American Mineralogist: 58: 551-551.
Brunton, G., Steinfink, H., Beck, C.W. (1958) The crystal structure of callaghanite, Cu8Mg8(CO3)4(OH)24·8H2O. Acta Crystallographica: 11: 169-174.

Internet Links for CallaghaniteHide

Localities for CallaghaniteHide

ⓘ - 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.
Austria
 
  • 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.
Germany
 
  • 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
Italy
 
  • 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.
USA
 
  • Michigan
    • Houghton Co.
      • Painesdale
Rocks & Min: 91:269
  • 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)
Mineral and/or Locality  
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