Question: what are the physical properties of quartzite?
Answer: Quartzite is a nonfoliated metamorphic rock composed almost absolutely of quartz. ... 
Texture: Granular.
Grain size: Medium grained; can see interlocking quartz crystals with the naked eye.
Hardness: Hard.
Colour: Pure quartzite is white but quartzite exists in a wide variety of colours.
Mineralogy: Quartz.