Polyhedral Agate end section, Ex. Jim Houran

Item Description

This specimen is part of the 2020 Dallas Mineral Collecting Symposium benefit auction, with proceeds benefiting Mineralogical Record, Rocks & Minerals, Tucson Gem and Mineral Society, and mindat.org. Thanks to all of our participants!

Billing for this auction will occur on Monday, August 24, for payment using PayPal or credit card. Shipping will be billed at cost, or please contact brandy@mineralauctions.com if you'd like to plan on picking up items at future shows or during a stop through Dallas.

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A rare example of the endcap of a polyhedral agate from Brazil. These are totally strange, unique things, apparently unique to a small region in Brazil. How do they form? I do not recall ever getting a satisfactory answer! Slices are common enough on the market, although quality is rare. But this is an endcap, showing how they form in nature and revealing the outside rough surface as well, also follows the trapezohedral shape. A strange mineral oddity! Valued $250-ish. Donation by Jim Houran.