Opal and ironstone “Yowah nut” concretion
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Opal and ironstone “Yowah nut” concretion, 5 cm, from Yowah Opal Fields, Queensland, Australia. Photo by Jeff Scovil.
Product details
Species
SizeMiniature
Dimensions5.0 cm
Added on02/13/2026
Locality
Publications
- Mineralogical Record Mineral Collections In American Midwest page 198
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Mineral guide
Learn about Opal
amorphous silica with water and a spectacular play-of-color; black, boulder, and fire opal varieties capture brightness, color, and collecting appeal.Regional guide
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