Opalised Yabby button fossils are only found at Lighting Ridge
Their scarcity makes them one of the most desired opalised fossils of the planet
Specifications:
Gem: Opalised Yabby Button Fossil
Weight: 1.54ct
Dimensions: 8.73 x 8.5 x 4.11 mm
Color: Green yellow, blue and purple
Origen: Lighting Ridge - Australia
Freshwater crayfish
The opalised gastroliths of freshwater crayfish are known locally as ‘yabby buttons.’ Crayfish use gastroliths to store calcium from their exoskeletons (‘shells’) before they moult, then release the calcium to harden their new protective coating. Fossil yabby buttons are usually around 10-12mm across