The passage describes the beauty of natural stones found along a riverbank, emphasizing their polished, rounded forms that resemble marbles or lozenges. The colors and patterns of the stones, with their veining and striping, give them an aesthetic appeal enhanced by the river's mist.
The imagery creates a vivid picture of the stones, highlighting not only their physical characteristics but also the serene environment in which they are found. The reflection of the mist adds a sense of tranquility and beauty to the scene, showcasing the harmony of nature.