Dugway Geodes
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Museum Specimens
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
$16.00
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 # 75DG08180040
Polished Face Fluorescent Dugway
Geode Half
$16.00
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 # 80DG08180040
Polished Face Fluorescent Dugway
Geode Half
$16.00
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 # 82DG08180040
Polished Face Classic Old Stock
Fluorescent Dugway Geode Half
$24.00
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
$17.00
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)
Item # 5-DG01194064
Polished Face Large Cabinet
Fluorescent Dugway Geode Half

$94.00
Exceptional Large Cabinet Chalcedony Chamber Fluorescent Dugway Geode. The large vug is like a
cavern that half is lined with druzy crystal and the other half with a matte layer with several flow line crystal
formations . This is a very interesting peice. The Chalcedony fluoresces Green and there is a bit of  
Calcite  on the edge that fluoresces Orange, both under Short Wave Ultra-Violet Light. This specimen
cut face is polished. Fluorescent photos taken with a Nikon coolpix L1 camera with the specimen under
a Way Too Cool 254 nm SW 9-Watt Lamp in a black out photo box.   

Measures 5.3 x 4.75 x 2.8 inches (13.5 x 12 x 7.1 cm) and weighs 47.4 oz or 2.96 lbs (1.35 kg)
"A" Grade Large Cabinet display polished face fluorescent Dugway Geode half. This geode vug has a
shaped structure made up of agate-like banded chalcedony that has formed drusy coated circular ridges
with 3 distinct deep pits or chambers inside. There are also some clear quartz mini point formations
sticking up in several locations. The most notable feature of this specimen besides the fact that the
chalcedony is electric green color fluorescent under SWUV lighting is that it resembles a triple chamber
drusy “Birds Nest” formation. Fluorescent photos taken with a Nikon coolpix L1 camera with the specimen
under a Way Too Cool 254 nm SW 9-Watt Lamp in a black out photo box.
Measures 4.6 x 3.78 x 2.3 inches (11.8 x 9.6 x 5.9 cm) and weighs 20.1 oz or 1.25 lbs (570g)
Item # 6-DG01190824
Large Cabinet Polished Face
Fluorescent Dugway Geode Half
$99.00
"AA" Grade Large Cabinet display polished face fluorescent double vug Dugway Geode half

Measures 4 x 3.1 x 1.6 inches (10.3 x 7.9 x 4 cm) and weighs 11.96 oz or 0.75 lbs (339g)
Item # 8-DG01192003
AA Grade Large Cabinet Polished
Face Fluorescent Dugway Geode
Half
$59.00
Note:
Items 8 and 9 are a matched pair of
double vug Dugway Geodes
"A" Grade Large Cabinet display polished face fluorescent Dugway Geode half. This deep geode vug is
lined with a bluish grey to clear quartz points.  This chalcedony quartz is a brilliant fluorescent electric green
color under SWUV lighting. Fluorescent photos taken with a Nikon coolpix L1 camera with the specimen
under a Way Too Cool 254 nm SW 9-Watt Lamp in a black out photo box.

Measures 4 x 3.28 x 3.29 inches (10.1 x 8.3 x 8.3 cm) and weighs 17 oz or 1.06 lbs (482g)
Item # 7-DG01193083
Large Cabinet Polished Face
Fluorescent Dugway Geode Half
$78.00
"AA" Grade Large Cabinet display polished face fluorescent double vug Dugway Geode half

Measures 4.5 x 2.9 x 1.4 inches (11.4 x 7.4 x 3.5 cm) and weighs 11.9 oz or 0.74 lbs (339g)
Item # 9-DG01191003
AA Grade Large Cabinet Polished
Face Fluorescent Dugway Geode Half
$59.00
Note:
Items 8 and 9 are a matched pair of double vug Dugway Geodes