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Dwarves' Earth Treasures Online Rock Shop:
Dryhead Agates
Bighorn & Pryor Mt Range, Montana (near Wyoming border)
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       The Dryhead Agates are named after many bison skulls found at the site. That was where the Native Americans were said to run the bisons over the cliff, killing many of them, and then arranging the bison skulls in ceremonial manner. The agates found nearby come in form of dark gray concretion nodules found along the dark shale between the limestones, and because of overlaying formations, it takes some hard digging thru the overlaying formations to obtain the nodules and only a small percentage of the nodules were said to be of any good. It used to be a fee collecting site in 1970s, and there had been changes in the ownership of the site and some mining activities using the heavy machinary. Currently, it appears that it's still off-limits to anyone, and there had been a lack of recent mining efforts that it is getting harder to find any good Dryhead Agate roughs.
    The brownish-orange agates are most common, but they have quite showy fluorescence due to interlaying with quartz. The transparent layers of the quartz strongly fluoresce green, hence, the glowing neon green lines against dark non fluorescing bands under ultraviolet light. They also can come in red, yellow, black, white and pink. The most desired color combo is orange (first bands), and strong pink to white at the center.
DRY2008n27-$20, whole half DRY2008n31-SOLD, cut from a tumbled rough
great as a fluorescent specimen
DRY2008n28-$20, fracture in the pink area DRY2008n29-$20, fracture in the pink area
or $30 for the pair
DRY2008n32-$20, a fracture in the red area DRY2008n32-$25, SLAB
DRY2008n30-$20,  fractures in the red area DRY2008n36-$25, faint fractures


DRY2008n35-$25, SLAB, some fractures