Coesite

  
Deep to light purple to lilac coloured, hexagonal ellenbergerite crystals to 0.75 mm in Coesite matrix
Origin: Dora Maira Massif, Parigi, Martiniana Po, Cuneo Province, Piedmont,, Italy
Ex. DeVito Collection
Sample size: 3 x 2 x 2 cm
 

Photo courtesy of: 

Tom Loomis

Dakota Matrix Minerals

 

This locality is a very high pressure metamorphism of Mg-rich pelites, at depths over 100km, have created this very unusual pyrope-coesite-quartzite, now exposed in the Western Alps.
Origin: Dora Maira Massif, Cuneo Province, Piedmont, Italy
Sample size: 21 x 12 x 11 mm
 

Photo courtesy of: 

Dan Weinrich

Dealer in fine mineral specimens

 

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