It's time to vote on our 2017 photo contest! Vote for your favorite photos of the year here!

Any idea what this is?

Ramona, CA(Zone 9b)

Any idea what type of rock this is? What is the the black section that looks somewhat like coal (but is very hard)?

Thumbnail by TLeaves
This thread has 15 replies. This forum is accessible only to subscribing members of Dave's Garden. There are many free features here, and about half of our forums are completely open to all members. Take a tour of our site and learn more about Dave's Garden, and explore the benefits of becoming a subscribing member.

Want to join? Register here. Already signed up? Click here to login!