sec·tile 
(sĕktəl, -tīl′)
(sĕktəl, -tīl′)adj.
Of or relating to a mineral that can be cut or severed smoothly by a knife but cannot withstand pulverization.
[Latin sectilis, from sectus, past participle of secāre, to cut; see sek- in the Appendix of Indo-European roots.]
sec·tili·ty (-tĭlĭ-tē) n.