DISTINGUISHING FEATURES OF THE SERIES. 127 



Corundum, sillimanite, green spinel (hercynite or pleonaste) and 

 rutile characterise the contact products in inclusions which are 

 regarded as xenoliths and not true members of the series. Scapolite, 

 sphene and lime-garnet occur where these rocks are associated with 

 crystalline limestones and are considered to be either primary or 

 secondary endogenous products of contact metamorphism. 



