The "Blue Star"  Thundereggs were discovered by Peter Ghitney and his son somewhere in the southern edge of Butler Ranch when they found a thunderegg with strong pastel colored biconoid agate. The commerical mining was attempted but ended shortly when they dug up too much thundereggs with too narrow agate cores so that mine was considered a bust and reclaimed as per BLM specifications. I have located that place and found some nice thundereggs that they missed on the reclaimed surface exposed by weathering.
    Most thundereggs contain bluish purple horizontally banded agates, hence "Blue Star" and few have been found with red to orange colors. Some surprise finds included yellow to orangish sagenite inclusions and tight-banded agates with shadow effects.

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Rough Appearance: Weathered tan thundereggs ("bleached") commonly with waterline agates.