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 # 8DG05205245
Polished Face Fluorescent Dugway
Geode Half
$109.00
Exceptional Large Cabinet Chalcedony Chamber Fluorescent Dugway Geode. The large swirling vug is like a
cavern that is lined with fine druzy crystals. The Chalcedony fluoresces a brilliant Green 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. Non-fluorescent
photos taken with same camera in outdoor natural light.   

Measures 5.79 x 4 x 3.45 inches (14.7 x 10.4 x 8.7 cm) and weighs 42.6 oz or 2.66 lbs (1.208kg)
Item # 9DG05209890
Polished Face Fluorescent Dugway
Geode Half
$19.00
Exceptional Chalcedony Fluorescent Dugway Geode. The vug is lined with fine
druzy crystals. The Chalcedony fluoresces a brilliant Green 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. Non-fluorescent photos taken
with same camera in outdoor natural light.   
Measures 2.3 x 1.9 x 1.1 inches (5.9 x 5 x 2.9 cm)
and weighs 3.42 oz or 0.21 lbs (97g)
Item # 10DG005202691
Polished Face Fluorescent Dugway
Geode Half
$42.00
Exceptional Large Cabinet Chalcedony Two Chamber Fluorescent Dugway Geode. The large two vugs
are like a cavern that each vug is lined with fine druzy crystals. The Chalcedony fluoresces a brilliant
Green 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. Non-fluorescent photos taken with same camera in outdoor natural light.   

Measures 2.9 x 2.5 x 1.5 inches (7.4 x 6.5 x 3.8 cm) and weighs 5.5 oz or 0.35 lbs (156g)
Item # 11DG05205204
Polished Face Fluorescent Dugway
Geode Half
$89.00
Exceptional Large Cabinet Chalcedony
Fluorescent Dugway Geode. This piece
has excellent crystalline formations in the
vug and is a very beautiful specimen.
The Chalcedony fluoresces a brilliant
Green with an added brilliant orange-red
Calcite addition that displays well 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.
Non-fluorescent photos taken with same
camera in outdoor natural light.   

Measures 4.2 x 3.6 x 2.4 inches
(10.8 x 9.2 x 6 cm)
weighs 21 oz or 1.32 lbs (598g)
Item # 12DG05206605
Polished Face Fluorescent Dugway
Geode Half
$119.00
Exceptional Large Cabinet Chalcedony single Chamber Fluorescent Dugway Geode. The vug is like a cavern that
has a botryoidal formation with a small stalactite and a formation lined with fine Amethyst influence druzy crystals.
This is a very interesting piece. The Chalcedony fluoresces a brilliant Green 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. Non-fluorescent photos taken with same
camera in outdoor natural light. Top left photo is in in-direct daylight, the bottom 2 left photos are in direct sunlight to
better show the lavender Amethyst color. The photo shows a vug open all the way through this piece.This one has a
felted bottom and is a very special geode!  

Measures 5.22 x 4.1 x 2.5 inches (13.2 x 10.5 x 6.5 cm) and weighs 26.8 oz or 1.68 lbs (762g)
Item # 13DG05204442
Polished Face Fluorescent Dugway
Geode Half
$49.00
Exceptional Chalcedony twisted Chamber Fluorescent Dugway Geode. The swirl vug is like a wonderous cavern
that has several mountain ridges and valleys lined with fine druzy crystals. This is a very interesting piece that has
some nice botryoidal formations in the larger vug area. The Chalcedony fluoresces a brilliant Green 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.
Non-fluorescent photos taken with same camera in outdoor natural light.   

Measures 3.2 x 2.7 x 1.4 inches (8.3 x 6.8 x 3.6 cm) and weighs 6.1 oz or 0.38 lbs (175g)
Item # 16DG05200001
Cut Face Fluorescent Dugway
Geode Pair
$49.00
Very nice Chalcedony single Chamber Fluorescent Dugway Geode cut face matched pair. This is a very
interesting piece that has some nice botryoidal formations in the vug area. The Chalcedony fluoresces a brilliant
Green under Short Wave Ultra-Violet Light. This specimen cut face is NOT 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. Non-fluorescent photos taken with same camera in outdoor natural light.   
Measures 2.8 x 2.1 x 1.48 inches (7.1 x 5.4 x 3.7 cm)
Measures 2.8 x 2.1 x 1 inches (7.1 x 5.4 x 2.7 cm)
and both halves together weigh 8.28 oz or 0.52 lbs (235g)
Item # 17DG05209901
Cut Face Fluorescent Dugway
Geode Pair
$49.00
Very nice Chalcedony two Chamber Fluorescent Dugway Geode cut face matched pair. This is a very
interesting piece that has some nice color and excellent shape. The Chalcedony fluoresces a brilliant Green
under Short Wave Ultra-Violet Light. These specimen cut faces are NOT polished. This piece slipped in my saw
vise. The slip cut is shown below in the first line of photos. I was going to re-cut or discard one half, but upon
further evaluation, the cut barely hit the vug and the pair still show well together. 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. Non-fluorescent photos taken with same camera in outdoor natural light.   
Measures 3.2 x 3 x 1.4 inches (8.2 x 7.7 x 3.7 cm)
Measures 3.2 x 3 x 1.2 inches (8.1 x 7.7 x 3 cm)
and both halves together weigh 13.52 oz or 0.85 lbs (383g)
Item # 18DG05200901
Cut Face Fluorescent Dugway
Geode Pair
$49.00
Very nice Chalcedony single Chamber Fluorescent Dugway Geode cut face matched pair. This is a very
interesting piece that has some nice botryoidal formations in the vug area. The Chalcedony fluoresces a brilliant
Green under Short Wave Ultra-Violet Light. This specimen cut face is NOT 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. The outer fluorescent band makes an interesting display. Non-fluorescent photos taken with same
camera in outdoor natural light.   
Measures 3.6 x 2.5 x 1.2 inches (9.2 x 6.3 x 3 cm)
Measures 3.5 x 2.4 x 1.3 inches (9.1 x 6.2 x 3.4 cm)
and both halves together weigh 11.94 oz or 0.75 lbs (339g)
Item # 19DG05201101
Polished Face Fluorescent Dugway
Geode Half
$19.00
Exceptional Chalcedony Fluorescent Dugway Geode. The vug is lined with fine
druzy crystals. The Chalcedony fluoresces a brilliant Green 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. Non-fluorescent photos taken
with same camera in outdoor natural light.   
Measures 1.96 x 1.73 x 0.82 inches (5 x 4.4 x 2.1 cm)
and weighs 1.82 oz or 0.11 lbs (52g)
Item # 20DG05209292
Polished Face Fluorescent Dugway
Geode Half
$69.00
Exceptional Large Cabinet Chalcedony
Fluorescent Dugway Geode. This piece
has excellent crystalline formations in the
vug and is a very beautiful specimen.
The Chalcedony fluoresces a brilliant
Green that displays well under Short
Wave Ultra-Violet Light. This specimen
cut face is polished and has a felted
bottom. 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. Non-fluorescent photos taken
with same camera in outdoor natural
light.   

Measures 4.2 x 3.76 x 1.7 inches
(10.7 x 9.5 x 4.3 cm)
weighs 15.3 oz or 0.96 lbs (436g)