From The O/U & cRc For Pesach: Composite Stone (i.e. quartz counters)

According to the O/U and cRc, composite stone (quartz, granite, marble etc.) counter tops, which is made mostly of stone, but is held together with resin, can be Kashered.  As a rule, materials such as metal, wood, stone, natural rubber, plastic (if needed), and fabric can be Kashered.

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