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cementing bluestone to concrete block

I am expanding my entry stoop. I have used 8x8x16 cinder blocks for the foundation that is 7' long by 12' wide. I used type s mortar to cement 1" thick bluestone slabs on top of the cinder blocks. The mortar is not bonding with the stone and I was wondering what I could be doing wrong or maybe using the wrong cement.
Thanks

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