google-site-verification: google9e1504ff8a61d6cc.html Geodes – phcrystal

Geodes

Caves are hollow, faintly spherical rocks that conceal large amounts of minerals (possibly including crystals). Crystals are formed by the filling of vesicles in volcanic and subvolcanic rocks by hydrothermally deposited minerals; or by the dissolution of syngenetic nodules and partial filling by the same or other minerals precipitated in water, groundwater, or hydrothermal fluids.

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