Formation

• According to the Mineral Information Institute (MMI), quartzite is formed from the metamorphism of quartz sandstone. Heat and/or pressure cause particles of quartz to compress into the extremely dense and weather-resistant quartzite.
  
  

Appearance

• The Minerals Zone describes quartzite as having a "sugary" granular appearance and, in its pure form, it tends to be light in color (white or gray, according to the MMI). However, added color or impurities in the original quartz sandstone can result in more vivid colors.
  
  

Uses

• R.V. Dietrich, Professor Emeritus at Central Michigan University, notes that quartzite can be used for a number of decorative items such as carvings, jewelry and paperweights. The MMI also notes that quartzite is becoming increasingly popular as a construction material. Since it breaks into flat surfaces, it can be used for "roofing tiles, as flooring and stair steps to name just a few applications."