Calcite
Cabeça da Chã quarry, Alcobertas, Rio Maior, Santarém, Portugal
This specimen of considerable dimensions was removed from a crevice in the limestone in front of the quarrying activity. At the peak of activity in this quarry, specimens had to be collected late in the evening because they would be crushed the next morning.
Rui Nunes' specimen and photo, August 2009.
© Rui Nunes 2009