An agate geode is a hollow agate lined with tiny quartz crystals. Agate geodes are formed in gas bubbles in lava. After the lava hardens around the bubble, water seeps through and deposits silicates and/or carbonates on the inside surface. Over time, this allows quartz crystals to form inside the hollow chamber. Bedrock containing geodes eventually weathers and decomposes, leaving geodes present at the surface. Agate geodes are found in Mexico, Brazil, Morocco and India.
November Alternative Birthstone
One of the many members of the quartz family, citrine, like amethyst, gets its striking yellow hue from traces of iron. It derives its name from its lemon-yellow color. Natural citrines are usually a pale yellow, and most commercial citrines are actually heat-treated amethyst or smoky quartz. Metaphysically, citrine is known as the “merchant’s stone” or “money stone,” and is said to bring prosperity. Deposits are found in Brazil, Madagascar, USA, and the Democratic Republic of Congo.