Respuesta :
A copper penny will scratch gypsum.
Define gypsum.
Calcium Sulfate dihydrate, having the chemical formula CaSO42H2O, makes up the soft sulfate mineral known as gypsum. [4] It is commonly mined, used as fertilizer, and the primary ingredient in various types of drywall, blackboard chalk, and plaster. Many societies, including Ancient Egypt, Mesopotamia, Rome, the Byzantine Empire, and the Nottingham alabasters of Medieval England, utilized a large fine-grained, white or lightly colored form of gypsum for sculpture. Selenite crystals that are translucent form when gypsum additionally crystallizes. It develops as an evaporite mineral and a byproduct of the hydration of anhydrite.
to know more about gypsum please check the link given below:
brainly.com/question/18369612
#SPJ4
