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Geodes are spheroidal masses
that form inside hollow
cavities in volcanic or sedimentary rocks, most commonly
basaltic lavas and limestones. The cavities themselves may
have been gas bubbles
in magma, or may have formed when nodules
inside sedimentary rocks dissolved.
As mineral-laden groundwater
or hydrothermal fluid seeps through the hollow cavities,
chemical precipitation begins to fill the hollows from the outside in,
often forming concentric
layers. Geodes commonly have a cryptocrytalline quartz shell
lined by various other minerals like calcite, pyrite, celestite, and
macrocrystalline quartz, often in crystals
visible to the naked eye.
Mother Lode Rock
PO Box 1812
Nevada City, CA 95959