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A crystal, is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. Microscopically, a single crystal has atoms in a near-perfect periodic arrangement; a polycrystal is composed of many microscopic crystals (called "...


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There is no good answer to this questions. All rocks contain all naturally occurring elements in the periodic table. Greater contents of an element in a rock do not necessarily translate into its abundance in the groundwater. For example, uranium contents are usually elevated in granites relative to basalts. But whether this uranium can be leached out ...


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