Dugway Geodes
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6 to 8 million years ago, volcanic activity in Western Utah deposited an igneous rock called rhyolite. Trapped gases
formed pockets in the rhyolite, which eventually became lined with chalcedony and quartz from groundwater. Most
Dugway Geodes fluoresce a lime green color due to minute amounts of a secondary mineral that bonded with the
quartz when it was growing. The fluorescence comes from uranium salts trapped in the Chalcedony. The level of
uranium is so low though, that it is undetectable, and totally harmless.

32,000 to 14,000 years ago, Lake Bonneville covered most of Western Utah. The lakes wave motion activity eroded
the rhyolite and actually moved the geodes several miles away to their current location near the town of Dugway in
Juab County, Utah. They are called Dugway Geodes because that is the only place on earth these are found!

Located on the edge of the salt flats of the Dugway Proving Ground, these West Desert geode beds are one of Utah’s
most popular rock collecting sites. Their convenient location near the gem collecting area of Topaz Mountain make
them an excellent companion stop for a family trek to the Thomas Range. This property is controlled by the Bureau of
Land Management (BLM) public lands. Active mining claims exist on some portions of the "geode area" so seek
permission from the claim owners before collecting. For more information on BLM public lands under claim contact
the House Range/Warm Springs BLM field office at (435) 743-3100.

Until recently, the best known free collecting claim was maintained by Loy Crapo of Delta, Utah. Since Loy’s passing,
his family has taken over management of the site. To justify the excavation and insurance expenses of maintaining the
site, visitors must now sign a liability waiver and submit a $30 fee per group to collect. In return, the Crapo family is
constantly excavating new collecting pits in the clay to ensure visitors have constant access to fresh material.
Item # 61DG8180040
Polished Face Fluorescent Dugway
Geode Half
$1
6.00
Measures 2.8 x 2.2 x 1.4 inches (7.1 x 5.7 x 3.6 cm) and weighs 4 oz or 0.25 lb (116g)
Item # 70DG08180040
Polished Face Fluorescent Dugway
Geode Half
$2
2.00
Measures 2.6 x 2.1 x 1.3 inches (6.6 x 5.4 x 3.3 cm) and weighs 4.5 oz or 0.28 lb (128g)
Item # 73DG08180040
Polished Face Rare Fluorescent
Dugway Geode Half
with Calcite
$3
2.00
Measures 3 x 2.7 x 0.94 inches (7.6 x 7 x 2.4 cm) and weighs 4 oz or 0.25 lb (116g)
Item # 75DG08180040
Polished Face Fluorescent Dugway
Geode Half
$1
6.00
Measures 3.3 x 2.4 x 1.1 inches (8.4 x 6.2 x 2.8 cm) and weighs 4.5 oz or 0.28 lb (128g)
Item # 77DG08180040
Polished Face Fluorescent Dugway
Geode Half
$1
6.00
Measures 3.2 x 2.4 x 0.93 inches (6.8 x 5.6 x 4.0 cm) and weighs 3.8 oz or 0.24 lb (110g)
Item # 78DG08180040
Polished Face Fluorescent Dugway
Geode Half
$1
6.00
Measures 2.7 x 2.5 x 1.1 inches (6.9 x 6.4 x 3 cm) and weighs 5.1 oz or 0.32 lb (145g)
Item # 79DG08180040
Polished Face Fluorescent Dugway
Geode Half
$1
6.00
Measures 2.5 x 2.4 x 1.3 inches (6.4 x 6 x 3.3 cm) and weighs 4.3 oz or 0.0.27 lb (123g)
Item # 80DG08180040
Polished Face Fluorescent Dugway
Geode Half
$1
6.00
Measures 2.7 x 2.3 x 1.4 inches (6.9 x 5.8 x 3.6 cm) and weighs 4.8 oz or 0.3 lb (137g)
Item # 81DG08180040
Polished Face Fluorescent Dugway
Geode Half
$1
6.00
Measures 3 x 2.5 x 1.2 inches (7.7 x 6.4 x 3 cm) and weighs 5.7 oz or 0.36 lb (163g)
Item # 82DG08180040
Polished Face Classic Old Stock
Fluorescent Dugway Geode Half
$2
4.00
Measures 3.2 x 2.2 x 1.3 inches (8.2 x 5.6 x 3.3 cm) and weighs 4.9 oz or 0.31 lb (141g)
Item # 83DG08180040
Polished Face 2 Chamber
Fluorescent Dugway Geode Half
$1
7.00
Measures 2.9 x 2 x 0.94 inches (7.5 x 5.2 x 2.3 cm) and weighs 2.9 oz or 0.18 lb (82g)
with Calcite