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Dwarves' Earth Treasures Museum:
Thundereggs of Australia
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     It appears that several different types of thundereggs have been found in Australia with two sites being best known. One site at Agate Creek produces the thundereggs with reddish orange agate cores. It is rare to find the Agate Creek thundereggs with wider agate cores and bandings, and many come with orange to yellow waterline structures.
    The other site is at Mount Hay which has been made a tourist park where the visitors are invited to look for the thundereggs.  Many thundereggs from that site are typically featureless tinted with brownish to orange colors, but some have been found with strong banding and bright colors.
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Thundereggs from Agate Creek, Queensland Province, Australia

Rough Appearance: Almost look like narrow disk-like concretions, usually with some ridges showing.
Rare fine multi-colored banding, w/ agatized zeolite center 
curvative polishing from  nodule broken in half)		 Rare fine multi-colored banding,  w/ agatized zeolite center 
curvative polishing from  nodule broken in half)

Thundereggs from Mount Hay, Wycarbah, Australia

Rough Appearance: Light tan color, smooth to bubbly surface, sometimes ridged.
With Shadowing effect Rare(?) reddish color  With Shadowing effect

You can see some Agate Creek Thundereggs for Sale at the Online Agate & Thunderegg Shop