Two clear solutions are mixed and a solid suddenly appears. What is that solid called?

1. Ions in solution can meet and form a product that will not dissolve. 2. A precipitate is the solid that forms in a solution during a chemical reaction. 3. Solubility rules tell you in advance which combination of ions will do this. 4. A reaction of this kind is called a precipitation reaction. _Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 18: Reactions in aqueous solution_