Crushed quartz stone is quartz mineral that has been mined and then processed through crushing machines to break it down into smaller, finer pieces. Quartz is one of the most abundant and hard minerals found in nature, composed primarily of silicon dioxide (SiO2). The crushed form of quartz is used in a variety of applications, including in the construction industry for making engineered stone surfaces like countertops, in landscaping, and even in some industrial processes where its hardness and chemical properties are beneficial.