per saperlo, sarebbe bastato che il robottino avesse dato una bella fresatina, in modo da valutarne la consistenza.La cosa,ce la siamo gią detta pił volte,ma ahinoi una grattatina a questo tipo di "rocce"non viene mai data o perlomeno, dalle immagini messe a disposizione,non č mai stata evidenziata un'operazione del genere. Chissą perche! Chissą! ciao a tutti.
Sembrano - effettivamente - delle spugne (magari essiccate, ma sempre spugne). Quoto Miro al 100%. Comuque, se vogliamo restare razionali (almeno per adesso), potrebbe/dovrebbe trattarsi di rocce vulcaniche caratterizzate dalla presenza di pseudo-vacuoli o vasi vescicolari.
"Vesicular texture is a volcanic rock texture characterised by, or containing, many vesicles. The texture is often found in extrusive aphanitic, or glassy, igneous rock. The vesicles are small cavities formed by the expansion of bubbles of gas or steam during the solidification of the rock. A related texture is amygdaloidal in which the volcanic rock, usually Basalt or Andesite, has cavities, or vesicles, that are filled with secondary minerals, such as Zeolites, Calcite, Quartz (NOT on Mars) or Chalcedony. Individual cavity fillings are termed amygdules (according to the American usage), or amygdales (according to the British usage). Sometimes these can be sources of semi-precious stones such as Agate. Rock types that display a vesicular texture include pumice and scoria".
"Vesicular texture is a volcanic rock texture characterised by, or containing, many vesicles. The texture is often found in extrusive aphanitic, or glassy, igneous rock. The vesicles are small cavities formed by the expansion of bubbles of gas or steam during the solidification of the rock. A related texture is amygdaloidal in which the volcanic rock, usually Basalt or Andesite, has cavities, or vesicles, that are filled with secondary minerals, such as Zeolites, Calcite, Quartz (NOT on Mars) or Chalcedony. Individual cavity fillings are termed amygdules (according to the American usage), or amygdales (according to the British usage). Sometimes these can be sources of semi-precious stones such as Agate. Rock types that display a vesicular texture include pumice and scoria".