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PSEUDOLEUCITES OF CORDON, ISABELA

RAYMUNDO A. REYES, JR

 

 

 

 

ABSTRACT



Pseudoleucites occur as phenocrysts in a tinguaite porphyry in Cordon, Isabela. Petrographic and x-ray diffraction studies show that it is composed chiefly of high sanidine (Or91Ab9) and hexagonal kalsilite (Ks80Ne20). Chemistry and xray data point to a transformation of highly potassic leucite starting material to component sanidine and kalsilite. Stoichiometric relationships do not support a simple breakdown or reaction mechanism. The addition of silica to form sanidine along with the possible removal of kalsilite may explain the resultant
composition of the pseudoleucite.



 

 

 

 

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