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.

Pas Yisroel during Aseres Yimei Teshuva
אלול — Guidance for Aseres Yimei Teshuva: Pas Akum, Pas Yisroel, and Rosh Hashana By Rabbi Eliezer Eidlitz Main Ideas During Aseres Yimei Teshuva, the