Can boulder opal be black?

G’day everyone, I hope you’re all well! In this video I get to finally see how some rough boulder opal, I bought a year ago, will turn out. The original plan of attack changed when I decided not to cut up the bigger piece into stones, and leave as a specimen. And to answer the question here, yes, Boulder opal can be black too. I hope you enjoy, thanks for your time. 🤪👍 My contact email: [email protected] My online store : theopalmills.com.au The wheel I use: [email protected] For Information on the formation of opal, here is a link to Len Crams input on the subject, including how base colours occur: https://www.sunriseopals.com/pages/le...