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.

Dugway Geode
Dugway Geode 43 (2)
Dugway Geode_01
Dugway Geode_02
Dugway Geode Dugway Geode 43 (2) Dugway Geode_01 Dugway Geode_02
Item # 43DG09217605

Polished Face Fluorescent Dugway Geode Half

$109.00

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Exceptional Large Cabinet Chalcedony Chamber Fluorescent Dugway Geode. The large swirling vug is like a cavern that is lined with botryoidal formations coated 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 6.5 x 5.1 x 1.8 inches (16.7 x 13 x 4.6 cm) and weighs 31.2 oz or 1.95 lbs (886g)

Dugway_Geode_21_4_2
Dugway_Geode_21_2_2
Dugway_Geode_21_4_2 Dugway_Geode_21_2_2
Item # 21DG12201372

Polished Face Fluorescent Dugway Geode Half

$54.00

Sold

Exceptional Large Cabinet 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 matt 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 5.5 x 4 x 1.3 inches (14.2 x 10.3 x 3.4 cm) and weighs 15.4 oz or 0.96 lbs (439g)

Dugway Geode 43 (1)
Dugway Geode F43 (1)
Dugway Geode 43 (1) Dugway Geode F43 (1)
Item # 44DG09218974

Polished Face Fluorescent Dugway Geode Half

$99.00

Very Nice Chalcedony Fluorescent Dugway Geode. The vug is like a cavern 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 5.1 x 4.2 x 2.2 inches (12.9 x 10.8 x 5.7 cm) and weighs 22.9 oz or 1.43 lbs (650g)

Dugway_Geode_23_4_
Dugway_Geode_23_2_
Dugway_Geode_23_4_ Dugway_Geode_23_2_
Item # 23DG12208373

Polished Face Fluorescent Dugway Geode Half

$76.00

Exceptional Large Cabinet 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 5.2 x 4.4 x 1.5 inches (13.2 x 11.3 x 3.9 cm) and weighs 19.6 oz or 1.22 lbs (557g)

Dugway_Geode_12_2_2
Dugway_Geode_12F_1_
Dugway_Geode_12_2_2 Dugway_Geode_12F_1_
Item # 12DG05206605

Polished Face Fluorescent Dugway Geode Half

$99.00

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)

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Dugway_Geode_24_2_
Dugway_Geode_24_4_ Dugway_Geode_24_2_
Item # 24DG12204152

Polished Face Fluorescent Dugway Geode Half

$49.00

Exceptional two vug Chalcedony Fluorescent Dugway Geode. The vugs are lined with fine druzy crystals. The Chalcedony fluoresces a brilliant Green under Short Wave Ultra-Violet Light. This specimen cut face is matt 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 3.7 x 2.6 x 1.1 inches (9.6 x 6.7 x 2.8 cm) and weighs 5.5 oz or 0.34 lbs (156g)

Dugway Geode 45 (1)
Dugway Geode 45 (2)
Dugway Geode 45 (1) Dugway Geode 45 (2)
Item #45DG09217143

Polished Face Fluorescent Dugway Geode Half

$69.00

This is a nice double Chalcedony crystal Fluorescent Dugway Geode. One side is solid chalcedony with swirls and the other side has vugs. The larger crystalline vug is lined with quartz crystals while the two smaller vugs are lined with drusy 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  4.3 x 2.2 x 1.1 inches (11.1 x 5.5 x 3 cm) and weighs 7.8 oz or 0.49 lbs (221g)

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Dugway_Geode_26_2_
Dugway_Geode_26_4_ Dugway_Geode_26_2_
Item # 26DG12202373

Polished Face Fluorescent Dugway Geode Half

$63.00

Exceptional Large Cabinet 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 matt 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 5.5 x 4 x 1.3 inches (14 x 10.3 x 3.4 cm) and weighs 16.9 oz or 1.05 lbs (479g)

Dugway_Geode_27_7_
Dugway_Geode_27_2_
Dugway_Geode_27_7_ Dugway_Geode_27_2_
Item # 27DG12203752

Polished Face Fluorescent Dugway Geode Half

$54.00

Highly polished 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 3.9 x 2.6 x 1.3 inches (10 x 6.8 x 3.4 cm) and weighs 10.2 oz or 0.63 lbs (289g)

Dugway_Geode_28_4_
Dugway_Geode_28_2_
Dugway_Geode_28_4_ Dugway_Geode_28_2_
Item # 28DG12203702

Polished Face Fluorescent Dugway Geode Half

$49.00

Highly polished 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 3.5 x 2 x 1.2 inches (9 x 5.2 x 3.2 cm) and weighs 5.9 oz or 0.37 lbs (170g)

Dugway Geode 46 (1)
Dugway Geode 46 (2)
Dugway Geode 46 (1) Dugway Geode 46 (2)
Item # 46DG09214844

Polished Face Fluorescent Dugway Geode Half

$95.00

Exceptional Large Cabinet Chalcedony Fluorescent Dugway Geode with two large chambers and three small chambers . The large chambers and one of the small chambers have botryoidal formations lined with fine druzy crystals. One small chamber is solid chalcedony and the other is solid rhyolite. 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 6.5 x 3.2 x 1.3 inches (16.6 x 8.1 x 3.4 cm) and weighs 16 oz or 1 lb (454g)

Dugway Geode 47 (1)
Dugway Geode 47 (2)
Dugway Geode 47 (1) Dugway Geode 47 (2)
Item # 47DG09213023

Polished Face Fluorescent Dugway Geode Half

$64.00

Exceptional double chamber Chalcedony Fluorescent Dugway Geode. The vugs have a combination of small quartz crystals and sections of drusy lined surfaces. There are several botryoidal formations as well 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 3.8 x 2.9 x 1.5 inches (9.7 x 7.3 x 4 cm) and weighs 8.5 oz or 0.53 lbs (243g)

Dugway_Geode_33_2_
Dugway_Geode_33_1_
Dugway_Geode_33_2_ Dugway_Geode_33_1_
Item # 33DG12207101

Polished Face Fluorescent Dugway Geode Half

$40.00

Beautiful multiple Vug Chalcedony Fluorescent Dugway Geode. The vugs have beautiful and unique formations. The Chalcedony fluoresces a brilliant Green under Short Wave Ultra-Violet Light. This specimen cut face is matt 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 3.3 x 2.6 x 1 inches (8.5 x 6.6 x 2.6 cm) and weighs 5.9 oz or 0.37 lbs (168g)

Dugway Geode 48 (1)
Dugway Geode 48 (2)
Dugway Geode 48 (1) Dugway Geode 48 (2)
Item # 48DG09216143

Polished Face Fluorescent Dugway Geode Half

$68.00

Extraordinary large Double Vug Chalcedony Fluorescent Dugway Geode. The vug has beautiful druzy crystal coating with a white coating of Aragonite which fluoresces brighter than the drusy quartz. The Chalcedony and Aragonite fluoresce 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 4 x 2.5 x 1 inches (10.1 x 6.4 x 2.7 cm) and weighs 7.6 oz or 0.47 lbs (215g)

Dugway_Geode_35_3_
Dugway_Geode_35_1_
Dugway_Geode_35_3_ Dugway_Geode_35_1_
Item # 35DG12206101

Polished Face Fluorescent Dugway Geode Half

$32.00

Beautiful Chalcedony Fluorescent Dugway Geode. The small vugs have beautiful druzy coatings. The Chalcedony fluoresces a brilliant Green under Short Wave Ultra-Violet Light. This specimen cut face is matt 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 3.1 x 2.7 x 1.3 inches (7.9 x 6.9 x 3.5 cm) and weighs 8 oz or 0.5 lbs (228g)

Dugway Geode 49 (2)
Dugway Geode 49 (7)
Dugway Geode 49 (2) Dugway Geode 49 (7)
Item # 49DG09214691

Polished Face Fluorescent Dugway Geode Half

$49.00

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Beautiful Botryoidal Vug Chalcedony Fluorescent Dugway Geode. The vug has stunning botryoidal formations. 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 2.7 x 2.2 x 1 inches (6.9 x 5.7 x 2.7 cm) and weighs 3.7 oz or 0.23 lbs (106g)