gemstone
Welo Opal
Hydrated amorphous silica (SiO2·nH2O)
AI-generated identification · may be incorrectHardness of 5.5-6.5 on the Mohs scale, exhibits a play-of-color phenomenon, vitriol to resinous luster, amorphous crystal structure.
Identified More gemstone →
Explore Welo Opal in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 5.5-6.5 on the Mohs scale, exhibits a play-of-color phenomenon, vitriol to resinous luster, amorphous crystal structure.
Formation & geological history
Formed from silica-rich solutions percolating through volcanic ash and sedimentary strata over millions of years.
Uses & applications
Primarily used in fine jewelry such as rings, pendants, and as highly prized collector specimens.
Geological facts
Ethiopian Welo opals are hydrophane, meaning they can absorb water and temporarily change transparency and weight.
Field identification & locations
Identified by its characteristic play-of-color and matrix host rock, commonly mined in the Welo province of Ethiopia.
More like this
Other gemstone specimens
Ammolite
Ammolite (Biogenic Aragonite with trace elements; fossils of Placenticeras meeki and Placenticeras intercalare)
mineral
Gemstone Ring
N/A - Set piece of jewelry, likely Amethyst or Garnet with Diamond or CZ
gemstone
Topaz
Al2SiO4(F,OH)2
mineral
Amber
Succinite (Organic Gemstone)
mineral
Diamond and Gold Jewelry
Carbon (Diamond) / Au (Gold)
gemstone
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary