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Conform datelor obtinute de cercetatorii americani, la suprafata solului martian a fost descoperita o noua categorie de minerale. Hidratii de siliciu, cunoscuti bijutierilor si publicului larg sub denumirea de opal, se gasesc pe Marte sub forma de mari depozite. Hidratii sunt minerale care contin apa in cantitati infime. Descoperirea unor astfel de depozite este un indiciu clar asupra prezentei apei in zonele respective. Pana in prezent, au fost descoperite doar doua tipuri de minerale hidrati: filosilicatii si hidratii de sulf. Silicatii de opal descoperiti recent sunt cele mai proaspete mostre de minerale hidrate de pe Marte. Este o dovada in plus ca pe aceasta planeta apa a existat cu 1 miliard de ani mai devreme decat au estimat initial cercetatorii.
Sursa: NASA
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