Libethenite, Cornetite

Specimen ID: 9QA-EM5

Mineral(s)
Libethenite : Cu2(PO4)(OH)
Cornetite : Cu3(PO4)(OH)3
Locality
As recorded:
L'Etoile du Congo Mine, Lubumbashi, Haut-Katanga, DR Congo
Mindat locality:
Dimensions
8cm x 8cm x 2cm
Collections
Current ownership:
The Tony Peterson collection.
Previous data
Mineral(s)
Acquisition date:
2009
Tony Peterson

Events

Photo added to mindat.org

Initially I thought that the libethenite (green) might be pseudomorphing cornetite (blue). However, the crystal forms are quite different and apparently stable crystals of each are in contact with one another. Presumably the very flat morphology arises because the fluids precipitating the minerals are percolating through the sandstone matrix, so that material can only be added to the edges of the crystals.
Tony Peterson - 7th October 2009

Photo added to mindat.org

Initially I thought that the libethenite (green) might be pseudomorphing cornetite (blue). However, the crystal forms are quite different and apparently stable crystals of each are in contact with one another. Presumably the very flat morphology arises because the fluids precipitating the minerals are percolating through the sandstone matrix, so that material can only be added to the edges of the crystals.
Tony Peterson - 7th October 2009

Photo added to mindat.org

Initially I thought that the libethenite (green) might be pseudomorphing cornetite (blue). However, the crystal forms are quite different and apparently stable crystals of each are in contact with one another. Presumably the very flat morphology arises because the fluids precipitating the minerals are percolating through the sandstone matrix, so that material can only be added to the edges of the crystals.
Tony Peterson - 7th October 2009

Photo added to mindat.org

Flat crystals of libethenite, in a form typical of cornetite for this locale. And cornetite is present on the specimen.
Tony Peterson - 25th December 2009

Photo added to mindat.org

FOV=1.5 mm. Flat crystals of libethenite, in a form typical of cornetite for this locale. This unusually thin crystal appears to have grown parallel to one of the pyramidal (pseudo-octahedral) faces. Collection and photo, T. Peterson. Macro photos of this specimen have been organized under parent photo #255568.
Tony Peterson - 25th December 2009

Photo added to mindat.org

FOV=2.5 mm. Flat crystals of libethenite, in a form typical of cornetite for this locale. A small crystal of cornetite decorates a corner of the central libethenite. Collection and photo, T. Peterson. Macro photos of this specimen have been organized under parent photo #255568.
Tony Peterson - 25th December 2009

Photo added to mindat.org

FOV=2 mm. Flat crystals of libethenite and cornetite. Both species on this specimen are of about the same size, but libethenite is far more abundant. Collection and photo, T. Peterson. Macro photos of this specimen have been organized under parent photo #255568.
Tony Peterson - 25th December 2009

Photo added to mindat.org

FOV=1.5 mm. Flat crystals of libethenite and cornetite. Collection and photo, T. Peterson. Macro photos of this specimen have been organized under parent photo #255568.
Tony Peterson - 25th December 2009

Photo added to mindat.org

FOV=2.5 mm. Flat crystals of libethenite, in a form typical of cornetite for this locale. These crystals are representative of the thickest present. Collection and photo, T. Peterson. Macro photos of this specimen have been organized under parent photo #255568.
Tony Peterson - 25th December 2009
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