3.3" Crystal Filled Dugway Geode - Sparkly Quartz
Roughly 32,000 to 14,000 thousand years ago wave action from a large lake that covered much of western Utah (Lake Bonneville) eroded the geodes from the rhyolite. These geodes were then deposited in the lake sediments. These ancient lake sediments are what is now known as the Dugway Geode Beds. The most common mineral found in these geodes in clear quartz, though amethyst and rose quartz can also occur. The geodes tend to be relatively small, average about the size of a baseball, though rare examples can be found up to a foot across.