Gruta do Carvão
Rua de Lisboa, Ponta Delgada, São Miguel - Portugal
Phone: +351 296 498 004 - Fax: +351 296 498 006
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Countless stalactites can be seen on the ceiling of the Gruta do Carvão, some conical in shape and others irregular, with a whitish colour. These are very fragile, and result from phenomena caused by the sedimentation of water that infiltrated into the cave. This water also caused the oxidisation of the basalt rocks that form the Gruta do Carvão, giving them red and orange tones. As in other caves in the Azores and on the island of São Miguel, what is seen here is evidence of different levels of lava that flowed through the inside of the cave at various times in the past.
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