Purple Fluorite II (Backlit) is a semi-precious gemstone surface — a Backlit semi-precious gemstone slab composed of angular purple fluorite crystal fragments in a mosaic of deep violet, plum, white and green tones set in a dark matrix; translucent pieces glow under backlighting. slab with a polished finish, often backlit as a feature panel, vanity or bar front. A dramatic decorative stone for interior feature applications.