2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/6618Within the realms of the possibility of solid quark matter, we fitted the 500ks Chandra LETG/HRC data for RX J1856.5-3754 with a phenomenological spectral model, and found that electric conductivity of quark matter on the stellar surface is about > 1.2 x 10^{18} s^{-1}.2 page and no figure, IAU Symposium No.218, or at http://vega.bac.pku.edu.cn/~rxxu/publications/index_C.htmAstrophysicsHigh Energy Physics - Phenomenologytext