Asked in Geology
What is the chemical composition of quartzite?
Quartzite, or metaquartzite, is sandstone which has undergone metamorphosis, resulting in the partial recrystallisation of the previous clasts in the rock into crystals. The composition depends on the type of sandstone it was previously, but in this case, 'Metaquartzite' most regularly refers to the metamorphosis of Orthoquartzite which is pure quartz. The crystals in the resulting rock are equal in size, and thus the texture is even. The composition of Quartz itself is Silica which is SiO2. ...
Asked in Geology, Earth Sciences
Why does granite or quartzite remain in boulder-sized pieces longer than older rocks that do not contain quartz?
Quartz is a mineral that is resistant to weathering due to its chemistry and crystalline structure. Granite will weather faster than quartzite because granite is only partially quartz in composition. ...