Dugway Geodes
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Museum Specimens
Dugway Geode Half (Fluorescent) This
beautiful saw cut and highly polished multiple
vug Geode half, from the Dugway, Utah
Geode Bed, has a clear drusy crystalline
interior over shades of grey to a hint of blue
chalcedony interior swirls with contrasting
brown rhyolite.

measures 3.1 x 2.6 x 1.5" (8 x 6.8 x 3.9 cm) and
weighs 173g (6.1 oz) 0.38 lb.
Item # 35DG09158931
Polished Natural Dugway
Geode Half

$28.00
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 # 50DG02163290
4.1 inch smooth cut Dugway Geode Half

$25.00
Dugway Geode Half (Fluorescent) This superbly smooth saw cut Geode half from the Dugway,
Utah Geode Bed has a milky crystalline botryoidal interior with shades of clear to a hint of blue
Chalcedony. Dugway Geodes are normally 0.25" to 2' in diameter.
This piece is 4.1 x 3.4 x 1.8" (10.5 x 8.8 x 4.6 cm)
and weighs 383g (13.5 oz) 0.84 lb
This specimen also fluoresces a brilliant green under SW ultra-violet light. (See bottom left photo
taken with a 9W "Way Too Cool" triple wave UV light.)
Item # 6DG11149912
4.3 Inch Polished Dugway Geode

$34.00
Dugway Geode (Fluorescent) This beautiful cut and polished Geode from the
Dugway, Utah Geode Bed has a botryoidal drusi white crystalline interior with shades
of clear to a hint of blue Chalcedony banding. This white lined piece is a very rare
specimen. Dugway Geodes are normally 0.25" to 2' in diameter.
This specimen measures 4.3 x 3.4 x 1.5" (11 x 8.7 x 4 cm)
and weighs 457g (16.1 oz) 1 lb
Besides being a great sample of a geode, this specimen also fluoresces a brilliant
green under SW ultra-violet light. (See second photo taken with a 9W "Way Too
Cool" triple wave UV light.)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. (purple is a reflection from the polished face)
Item # 60DG04160040
Polished Face Fluorescent
Dugway Geode Half
$15.00
Item # 51DG02164290
4.3 inch smooth cut Dugway Geode Half

$25.00
Dugway Geode Half (Fluorescent) This superbly smooth saw cut Geode half from the Dugway,
Utah Geode Bed has a milky crystalline botryoidal interior with shades of clear to a hint of blue
Chalcedony with a white Calcite coating. Dugway Geodes are normally 0.25" to 2' in diameter.
This piece is 4.3 x 3.5 x 1.9" (10.9 x 9 x 4.8 cm)
and weighs 473g (16.6 oz) 1.04 lb
This specimen also fluoresces a brilliant green under SW ultra-violet light. (See bottom left photo
taken with a 9W "Way Too Cool" triple wave UV light.)
Item # 53DG02165231
3 inch Smooth Cut Dugway Geode Half with unique
Cubic Calcite

$35.00
Dugway Geode Half (Fluorescent) This superbly smooth saw cut Geode half from the Dugway,
Utah Geode Bed has a milky crystalline botryoidal interior with shades of clear to a hint of blue
Chalcedony with cubic white Calcite crystals. Dugway Geodes are normally 0.25" to 2' in diameter.
This piece is 3 x 2.1 x 1.1" (7.6 x 5.4 x 2.8 cm)
and weighs 100g (3.5 oz) 0.22 lb
This specimen also fluoresces a brilliant green under SW ultra-violet light. (See bottom left photo
taken with a 9W "Way Too Cool" triple wave UV light.)
Item # 54DG02164231
2.9 inch Smooth Cut Dugway Geode Half

$27.00
Dugway Geode Half (Fluorescent) This superbly smooth saw cut Geode half from the Dugway,
Utah Geode Bed has a milky crystalline botryoidal interior with shades of clear to a hint of blue
Chalcedony. Dugway Geodes are normally 0.25" to 2' in diameter.
This piece is 2.9 x 2.1 x 0.85" (7.4 x 5.3 x 2.1 cm)
and weighs 81g (2.8 oz) 0.17 lb
This specimen also fluoresces a brilliant green under SW ultra-violet light. (See bottom left photo
taken with a 9W "Way Too Cool" triple wave UV light.)
Measures 2.6 x 2.3 x 1.6 inches (6.8 x 6.0 x 4.0 cm) and weighs 6.2 oz or 0.38 lb (177g)
Item # 61DG04160040
Polished Face Fluorescent
Dugway Geode Half
$15.00
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 # 62DG04160040
Polished Face Fluorescent
Dugway Geode Half
$15.00
Measures 2.7 x 2.5 x 1.1 inches (6.8 x 6.4 x 2.9 cm) and weighs 4.8 oz or 0.3 lb (137g)
Item # 63DG04160040
Polished Face Fluorescent
Dugway Geode Half
$15.00
Measures 2.3 x 2.3 x 1.5 inches (5.9 x 5.8 x 3.8 cm) and weighs 6 oz or 0.37 lb (171g)
Item # 64DG04160040
Polished Face Fluorescent
Dugway Geode Half
$15.00
Measures 2.8 x 2.3 x 1.4 inches (7.1 x 6 x 3.6 cm) and weighs 6.7 oz or 0.42 lb (191g)
Item # 65DG04160040
Polished Face Fluorescent
Dugway Geode Half
$15.00
Measures 2.6 x 2.2 x 1.5 inches (6.8 x 5.6 x 4.0 cm) and weighs 5.2 oz or 0.33 lb (150g)
Item # 66DG04160040
Polished Face Fluorescent
Dugway Geode Half
$15.00
Measures 2.5 x 2.4 x 1.5 inches (6.4 x 6.2 x 4 cm) and weighs 7.1 oz or 0.44 lb (202g)
Item # 67DG04160040
Polished Face Fluorescent
Dugway Geode Half
$15.00
Measures 3.2 x 2.2 x 1.2 inches (8.3 x 5.8 x 3.1 cm) and weighs 6.8 oz or 0.42 lb (194g)
Item # 68DG04160040
Polished Face Fluorescent
Dugway Geode Half
$15.00
Measures 2.7 x 2.5 x 1.4 inches (7.1 x 6.4 x 3.6 cm) and weighs 7.2 oz or 0.45 lb (206g)
Item # 69DG04160040
Polished Face Fluorescent
Dugway Geode Half
$15.00
Measures 2.7 x 2.7 x 1.5 inches (6.8 x 6.8 x 3.8 cm) and weighs 7.2 oz or 0.45 lb (205g)
1 Vug + Partial Vug