Mineral Database (Saesneg yn unig)

Mineral Database (Saesneg yn unig)
Mineralogy of Wales

Georgeite

Crystal System: Amorphous
Formula: Cu2(CO3)(OH)2.6H2O
Status of Occurrence: Confirmed Occurrence - 1st UK recording
Distribution: Rare
Chemical Composition: Copper carbonate hydroxide hydrate
Method(s) of Verification: georgeite is X-ray amorphous, but material from Britannia Mine has been shown to be identical to that from the type locality (Gaines et al., 1997). Pollard et al. (1989) noted that the IR spectrum corresponds with that listed by Bridge et al. (1979).
Chemical Group:
  • Carbonates
Geological Context:
  • Supergene : post-mining oxidation & weathering deposits
Introduction: georgeite is the amorphous analogue of malachite, forming as an extremely rare secondary mineral in weathered copper-bearing orebodies
Occurrence in Wales: Pollard et al. (1989) produced only the second worldwide occurrence of georgeite in describing the mineral from Sneyd’s Level, at Britannia Mine in Snowdonia.
Key Localities:
  • Britannia Mine, Snowdonia, Gwynedd: amorphous pale blue georgeite is overgrown by flattened acicular carbonation connellite and associated with spherical malachite aggregates. It occurs in oxidized vein material immediately adjacent to the lanthanite-(Ce) locality described by Bevins et al. (1985) in Sneyd’s Level.
References:
  • Bevins, R.E., Rowbotham, G., Stevens, F.S., Turgoose, S., & Williams, P.A., 1985 Lanthanite-(Ce), (Ce,La,Nd)2(CO3)3.8H2O, a new mineral from Wales, U.K.  American Mineralogist, 70, 411-413.
  • Bridge, P.J., Just, J. and Hey, M.H., 1979 Georgeite, a new amorphous copper carbonate from the Carr Boyd mine, Western Australia.  Mineralogical Magazine, 43, 97-98.
  • Gaines, R.V., Skinner, H.C.W., Foord, E.E., Mason, B. & Rosenzweig, A., 1997 Dana’s New Mineralogy. The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana. 8th Edition.  John Wiley & sons, inc. 1819 pp.
  • Pollard, A.M., Thomas, R.G., Williams, P.A., Bevins, R.E. & Turgoose, S., 1989 Carbonatian connellite, a new variety, from the Britannia Mine, North Wales, and from the Botallack Mine, Cornwall.  Journal of the Russell Society. 2 (2), 23-27.