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.
Interesting Facts. A geode begins as a bubble in volcanic rock or a hollow in sedimentary rock. The outer shell of the bubble or hollow will eventually harden, and water forms on the inside of the cavity. The water contains silica precipitation that contains a variety of dissolved minerals.