Trisha Shetty (Editor)

Fassaite

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Category
  
Mineral

Crystal system
  
Monoclinic

Formula (repeating unit)
  
Ca(Mg,Fe,Al)(Si,Al)2O6

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Crystal class
  
Prismatic (2/m) (same H-M symbol)

Color
  
light-dark green, black

Crystal habit
  
prismatic, short, plane

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Fassaite is a variety of augite with a very low iron content, Ca(Mg,Fe,Al)(Si,Al)2O6. It is named after the Fassa Valley, Italy.

Contents

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.

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References

Fassaite Wikipedia