Lustre

(lūs'tr.) [Fr., from L. lust ris, a shining.] (Min.) Aterm applied in mineralogical works to expre certain effects of light. The L. of minerals is of 5 kinds: 1, splendent, that is, when in full daylight it can be seen at a great distance; 2, shining, when at a distance the reflected light is weak; 3, glistening, when the lustre is only observable at no greater distance than an arm's length; 4, glimmering, when the object held near the eye in full daylight, presents a number of shining points; 5, dull, when the surface exhibits no brilliancy. [s. 561]