quartzite

=Quartzite = =  Formation =

Contact metamorphism and Regional metamorphism
=Colors = snowy white less of pink and sometimes gray  =Characteristics= Thin smooth surface 

=Classification = Non-foliated = = == = = =5 Interesting Facts= =Uses of rocks = = = Heat ray lamps spectrongraphic 
 * 1) Hardness 6.5 to 7
 * 2) Density 2.3 to 2.4 kg/cm3
 * 3) Compressive strength 90 to 140 n/mm2
 * 4) Water absoption 1-1.2%
 * 5) Porosity low to very low