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Product Description
Priday Agate Thunderegg Richardson Ranch Polished Stone Slab
A Priday Agate thunderegg from the famous Richardson Rock Ranch in Oregon that is slabbed and polished on one face and left natural rough on the edges.
This larger slice is 5.8 inches by 4.4 inches and 7 mm or .28 of an inch thick.
The lovely piece is translucent in areas with really cool moss inclusions! It also has some natural fracture lines. There is also a fill-1st picture bottom left, orangey area.
It came from an old collection.
Thundereggs are found all over Oregon and have been Oregon's State Rock since 1965.
Richardson’s Rock Ranch, located northeast of Madras, is probably the most world-famous thunderegg deposit. There are several beds in the Priday area. The Priday Plume is a gorgeous mix of agate and opal with colorful plumes within a thunderegg matrix.
A Thunderegg, is a spherical geode rock with a rough and unappealing surface, but when cut in half is filled with agate, jasper, quartz and/or other minerals. Typically, they are about two to six inches in diameter, although very large ones have been found!
Thundereggs were formed in the rhyolite lava flows and tuffs within the gas or steam pockets that served as molds. The pocket cavity was filled with silica-rich fluids and later solidified and crystallized. Mineral impurities are collected along the bands creating concentric colorful rings.
The name “thunderegg” is believed to have originated from Native American folklore. 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.
