Black Rock Desert
6.53 x 4.52 x 0.40 inches (16.60 x 11.50 x 1.03 cm)
This rough oval slice, from a nodule-like rock similar to a filled geode, is a thunderegg that formed within rhyolitic volcanic ash layers. There is a double star-shape center of Chalcedony which has been fractured following deposition of Agate. The pattern is remarkable for a natural piece, and the slab, from the Black Rock Desert of Nevada, features unique contrast with one star being hollow, while another is filled solid.
[Scale: 1 inch, with mark at 1 cm]
Condition report available upon request.
*Heritage Auctions strives to provide as much information as possible but encourages in-person inspection by bidders. Statements regarding the condition of objects are only for general guidance and should not be relied upon as complete statements of fact, and do not constitute a representation, warranty or assumption of liability by Heritage. Please note that we do not de-frame lots estimated at $1,000 or less and may not be able to provide additional details for lots valued under $500. All lots are sold "AS IS" under the Terms & Conditions of Auction.
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