Quartzite: Metamorphic Rock
WEBIf you must use your hammer on quartzite, be sure that you are wearing impactresistant goggles, gloves, long sleeves, long pants, and sturdy shoes. ... Quartzite is valued as a raw material because of its high silica content. A few unusual deposits have a silica content of over 98%. These are mined and used to manufacture glass, ferrosilicon ...