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Italy, Sardegna, Cagliari prov.,
San Vito, monte Narba mine
Ag mines, around the main one of Monte Narba (the silver rich vein of
Sarrabus, with main plants of Masaloni, Monte Narba, Giovanni Bonu
slope. ect)
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Acanthite
Metallic pseudo-cubic XX, not well formed but clearly visible, up to 1cm,
with
calcite. Acanthite is the low-temperature modification of silver sulphide
argentite; when temperature is under 180°C the crystal structure changes to
acanthite (so argentite specimens are really always acanthite pseudomorphs after
argentite)
7x4cm
Mt Narba mine, San Vito, Cagliari. Italy
Specimen n.741
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Silver
Sculptural formation of silver, 1.7x1.2 cm wide, on a calcite matrix
4x3.5cm
Mt Narba mine, San Vito, Cagliari. Italy
Specimen n.1454
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Ullmannite
Pseudocubic XX, with metallic luster; edge max around 0.3cm,
sourronded by other ullmannite. It is a rare nickel mineral that belongs
to the cobaltite group
11x6cm
Mt Narba mine, San Vito, Cagliari. Italy
Specimen n.823
Another photo:
entire specimen
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© Fernando Metelli. All photos
and other material on this site are copyright, if you wish to use them please
contact me for permission.
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