A Bakerâs cyst is also known as a popliteal cyst or synovial cyst. It is a soft, fluid-filled lump that forms on the back of the knee. The lump is sometimes mistaken for a blood clot.
Geodes are typically agates. Agates are very common stones, and usually do not fetch a high price, but they are gorgeous to look at. Geodes in particular can be quite incredible, because they are like little miniature caves. On the outside, they look like plain, rough stones.
Geodes can be found in many places throughout the world. They often accumulate in stream bottoms. Some of the finest specimens come from the Keokuk area of southeastern Iowa, which has the geode as its official state rock. Many gem shops sell small geodes, which can be cracked open to find the crystals inside. Larger geodes are often cut, polished, and displayed. Reviewed by Donald L. Koch State Geologist, Iowa Geological Survey Bureau