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Agate is a layering of quartz caused by the
precipitation of the mineral in layers. Each layer has slightly
different trace elements, so the color changes. Imagine a geode
forming in a large void in volcanic rocks. Water, supercharged with
silica, precipitates from the sides of the void toward the inside. This
gives a layer affect. If the entire geode fills up (then it is called a thunderegg)
and broken into pieces and tumbled, you can form beautiful layered
stones. Many of the cheaper agates have brilliant colors, but these are
artificially created.
Adventurine has a green color caused by hematite
inclusions. Many mystics feel that adventurine contains the healing
power of the green Earth and to release emotional stress. Adventurine is
sometimes marketed as a jade-like gem.
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Agate
Adventurine necklace
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