“...The agates were discovered by accident while investigating the reported site of quartz lined geodes at Temporal Glutch, Patagonia, Arizona. I was trying to find out what kind of nodules those geodes are (was hoping for thundereggs) and it turns otu that they're amygdaloids. The agates are quite small and commonly with calcite or quartz cores. I was able to trace the small agates to the basalt host where I found in-situ orangish agate. The colors tend to be just white to tan with some purplish and reddish hues. ....It would be better to just grind down the agate nodules than cutting them in order to get a good agate patterns without exposing the quartz/calcite cores..”.
written by Jeffrey Anderson on his website Dwarves´earth treasures