Once one of the rarest and most collectable Canadian stones, they have started to appear on the market a bit more in the early 2020s, though still far from common. They are also one of the most beautiful. Originally, they were characterized by a very clean green matrix with radial patterning, but recently specimens showing more red have started to appear. Either way, they are an interesting and varied location.
Amazing Black Dome Thunderegg with Agate, Quartz and Orange Opal
Black Dome Thunderegg with Waterline Agate
Black Dome Thunderegg with Beautiful Waterline Agate