Popcorn
Nodules of mineral deposits formed in such a way as to resemble popcorn.
Rimstone
A calcite deposit around the edge of a pool of water.
Sedimentary rock
Formed from deposits of sediments or from fragments of other minerals.
Shale
A sedimentary rock formed from deposits of clay or silt.
Solution
The process by which a substance is chemically combined with a liquid. Also, the state of being chemically so combined.