Grey agate

  • Chemical formula: SiO₂ silicon dioxide
  • Crystal system: Rhombohedral (microcrystalline )
  • Color: banded
  • Crystal habit: Cryptocrystalline silica
  • Cleavage: None
  • Fracture: Conchoidal with very sharp edges


Grey agate is a type of Quartz gemstone that is different from other Agate stones. Fossil agate is actually made from pieces of broken shells that rested deep on the bottom of the seas and rivers in the mud. Pressure and other surrounding factors play their part in creating this interesting gem.


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