in Crook, Jefferson, Malheur, Wasco and Wheeler counties. The world's largest thunderegg, a 1.75 ton specimen, is housed by the Rice Northwest Museum of Rocks and Minerals in Hillsboro, Oregon. Legend Native American legend reportedly considers the rocks to be the eggs of the thunderbirds which occupied Mount Hood and Mount Jefferson. Thunder Spirits on the mountains hurled the "eggs" at each other. Images See also Lithophysa References External links Geode Kid's Collection in Deming New Mexico on Mindat Geologic Snowflake Hunters Flock To Oregon For Thundereggs Documentary produced by Oregon Field Guide Gemstones Minerals Igneous rocks Symbols of Oregon Cascadian folklore