Rocks, Fossils, and Minerals for Sale
  Welcome, All Rockhounds!
If you're hunting for Rocks, Minerals, and Fossils, you've hit the Mother Lode!  At Mother Lode Rock Shop, you get to pick.  Choose the exact specimens you want from our wide-ranging collection of Rocks, Minerals, and Fossils.

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Brazilian Agate Geodes For Sale
Agate Geodes
Oco Geodes For Sale
Moroccan Geode Pairs For Sale
Moroccan Geode Pairs

Rocks, Minerals, and FossilsGeodes 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.
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Mother Lode Rock Shop
PO Box 1812
Nevada City, CA 95959