The word "crystal" refers to a type of solid material with atoms arranged in a repeating pattern. It can be transparent and often has a distinct shape and sparkle. Full definition
This is a fabulous 3 bedroom beachfront villa, with views of crystal clear water and unforgettable sunsets. (paradizo.com)
We need to get our act together and respond against crystal palace on the weekend! (justarsenal.com)
Within minutes from our beach there are many intact and historic wreck sites dotted along the shoreline in depths ranging from 32 feet to 70 feet of crystal clear waters. (fairmont.com)