Cleavage: Cleavage Refers into a mineral's tendency to interrupt alongside certain planes of weakness. Gypsum exhibits ideal cleavage in a single route and good cleavage in another route. This permits it to interrupt into predictable flat or a little angled pieces. Agates: A sort of quartz that kinds in volcanic https://www.propanraya.com/id/produk/eco-gypsum-ee-4050