boulder opal

Questions

What does boulder opal mean?

An opal consisting of concretions and fracture fillings in a dark siliceous ironstone matrix.

How to pronounce boulder opal

1. Open the pronunciation page — Open the Speakur entry for “boulder opal”.
2. Read the phonetic spelling — Read the IPA spelling () so you know which sounds to aim for.
3. Play the audio — Click Play to hear reference audio for “boulder opal”.
4. Repeat and practice — Say “boulder opal” aloud, matching stress and vowels until it feels natural.