"Azabache, otherwise known as black amber, comes from a family of Jurassic trees that were extinct more than 65 million years ago. ... The stone is jet black and when polished shines bright. It was once highly valued due to the belief around the stone's abilities." 

Mell, About the Author: Ashleigh, and Top 10 Must-See sights on the Camino Francés - Andaspain November 12. “Azabache - Stone of the Camino.” Andaspain Walking Adventures, 2 Apr. 2020, andaspain.com/blog/azabache/.