Cleavage: Cleavage refers to the mineral's tendency to break alongside certain planes of weakness. Gypsum displays great cleavage in one route and superior cleavage in another course. This allows it to interrupt into predictable flat or slightly angled pieces. Agates: A form of quartz that varieties in volcanic rock. They https://www.propanraya.com/id/produk/eco-gypsum-ee-4050