Draconites
Stones also known as dentrites, draconius, or obsianus. According
to Albertus Magnus a draconite is a shining black
stone of pyramidal shape that is obtained from the head of a
dragon, cut off while the animal is still panting. It subdues poison
and endows its possessor with invincible courage. The kings
of the East were said to have esteemed it a great treasure.