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Possessive determiners are used to modify a following noun : Your book, John's book. ('Your' / 'John's' : Possessive determiner).
This book is yours. (Here, 'yours' ----> a possessive pronoun.)
This book is John's. (Here, 'John's' -----> a possessive noun)
I know the double possessive follows a noun. But can we use double possessive after the 'be'-verbs?
(1) This book is of yours (instead of, "This is a book of yours. )
(2) This book is of John's (instead of "This is a bookof John's.)
The phrase "is of" is a preposition phrase which has the meaning "to possess intrinsically; give rise to." The words can appear together (This book is of high quality) or separated by the item being referred to (This is a book of high quality)
You are using the word 'of' in this case as a function word to indicate belonging or a possessive relationship.
Thus, using it with the second possessive (yours or John's) is redundant, and creates a conflict with the commonly understood meaning of "is of," which basically makes the sentence incomprehensible, even though we can probably glean the intention of the writer.
