Yes, you are right. Rings of Saturn mostly consist of icy particles, with a trace component of rocky material. On average, the smallest water ice is measured in microns, while the largest is 10s of meters.
In our solar system, the rings of Saturn are the largest ring systems compared to other planet. The rings of Saturn are made of enormous amounts of small materials that orbit around Saturn. These materials are mostly water ice with small amount of rocky materials. Dates back to 1610, Galileo Galilei was the first scientist to observe Saturn's ring using his telescope; unfortunately he was unable to identify them as such.
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