Reference Entry


Edited by Michael Allaby

in A Dictionary of Geology and Earth Sciences

Fourth edition

Published in print January 2013 | ISBN: 9780199653065
Published online September 2013 | e-ISBN: 9780191744334

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An important rock-forming *mineral group, with the general formula X3Y2Si3O12, where

Reference Entry.  198 words. 

Subjects: Earth Sciences and Geography

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