Reactions in Solutions
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žWhen these hot water-based solutions escape from a mass of magma, they are called hydrothermal solutions.
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žAs a result of contact with hydrothermal solutions, a change in a rock’s overall composition may occur.
http://www.dinosaurstore.com/images/fossils/Vanadinite%202.jpg http://www.stonegoddess.com/Stone-Goddess-Stonetalk/images/Rhodochrosite.jpg