title: Fassaite
text: # Fassaite
  
  Fassaite is a variety of augite with a very low iron content, $Ca(Mg,Fe,Al)(Si,Al)_2O_6.$ It is named after the Fassa Valley, Italy.
  
  It is thought to be a contact mineral formed at high temperature on the interface between volcanic rocks and limestone. It is also reported in meteorites.
  
  