One intuitively chosen Chiastolite 

Approx 1.25-1.5 by 1.25-1.5 inches 

Chiastolite: aka cross stone. Promotes perseverance, strength and power. Very protecting, deflects negative energy rather than absorbing it. Traditionally used to ward off courses. Very calming and grounding (root chakra)

(Metaphysical benefits are not to be taken as medical advice and are for entertaining purposes only)