DENVER GEM & MINERAL SHOW
SEPT 4 - 7 2025
THE WESTIN WESTMINSTER
Denver's Original Gem & Mineral Show
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The Greater Denver Area Gem & Mineral Council is pleased to announce that it will again be hosting the 57th Annual 2025 Denver Gem & Mineral Show in conjunction with the Hardrock Summit, to be held at the The Westin Westminster, Thursday thru Sunday:
​​See You
September 04-07, 2025
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The theme of the 2025 Show is Worldwide Barite & Calcite
The 2025 Denver Gem & Mineral Show (DGMS) in conjunction with the Hardrock Summit will be held again at the Westin Westminster Hotel from September 4-7, 2025. The address for the hotel is 10600 Westminster Blvd, Westminster, CO 80020.
The DGMS will have a separate area at the hotel that includes dealers, fluorescent room, special exhibits, education displays, gold planning, and grab bags.
Hours for the Show are Thursday through Saturday 10:00am to 5:00 pm and Sunday 10:00am to 3:00pm. Admission and parking for Hardrock Summit and DGMS will be FREE.
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Denver Gem and Mineral Show theme: Worldwide Barite and Calcite
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The 2025 mineral theme for the Denver Gem and Mineral Show® is barite and calcite from worldwide localities. These two minerals, often associated together, are found in sedimentary, metamorphic, hydrothermal veins and even rarely igneous pegmatites. Calcite localities in Colorado are also abundant from the hydrothermal veins in the San Juan mountains, and the sedimentary rocks of west slope Colorado and in the septarian nodules in the Great Plains.
Calcite provides numerous opportunities to create specialized displays. Calcite colors cover almost the entire spectrum. Some of the colors displayed are purple calcite from Balmat, NY, green calcite from Garfield County, Utah, golden calcite from Elk Creek, Meade County, South Dakota, fluorescent red calcite from Becker quarry, Tolland County, Connecticut, violet calcite from Bou Azzer mining district, Morocco, and fluorescent blue and green calcite from Franklin, Sussex County, New Jersey. Calcite also can exhibit unique crystal forms including sand calcites from localities around the world including Rattlesnake Butte, South Dakota. Calcite twining is varied with calcite pseudomorphs also common. They included calcite coatings of anhydrite, quartz, fluorite and even barite as well as calcite being replaced or coated by quartz
Although barite displays a smaller diversity in colors and forms than calcite, specialized exhibits can be created based on locality, color or form. Barite is abundant in many worldwide localities. Prominent foreign localities are, for example Huánuco, Peru; the Rock Candy mine, British Columbia, Canada; Santa Lucia mine, Sardinia, Italy, or the Dreisler mine, Germany. Barite localities in Colorado are also abundant from the hydrothermal veins in the San Juan mountains, and the sedimentary rocks of west slope Colorado and in the septarian nodules or late-stage veins in the Great Plains.
The most common colors of barite for example are clear, colorless gem crystals from the Book Cliffs, north of Grand Junction, and the Great Plains of Colorado; white crystals from the San Juan mountains and near New Raymer, Colorado; blue crystals from near Stoneham and Hartsel, Colorado; and golden yellow crystals from the Sherman mine, Lake County, Colorado. Barite crystals commonly form flattened crystals that are chisel-terminated, spear-terminated or a parallelogram. The rarer unique forms include white dendritic barite from Los Verdes Hills, Los Angeles County, California, or barite roses from central Oklahoma and New Raymer, Colorado
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Figure 1. Twinned calcite, Porvenir mine, Chihuahua, Mexico, Terry E. Huizing specimen, Denver Gem and Mineral Show® 2018.
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Figure 2. Calcite, West Papua (former Irian Jaya), Indonesia, Obtained circa 1995, former David Potter collection.
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Figure 3. Green calcite, Garfield County, Utah. Mined by Erin Delventhal and Philip Simmons. Sold at Denver Gem and Mineral Show® 2019.
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Figure 4. Gem optical calcite, Rio Urique, Mexico. Mined circa 1944 by O. A. Reese and from his collection. Currently in Paul R. Stewart collection, Waynesburg University, Pennsylvania.
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Figure 5. Barite, Stoneham, Colorado, Denver Museum of Nature and Science collection, Denver Gem and Mineral Show® 2022.
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Figure 6. Blue barite, Muddy Creek, Rio Grande County Colorado. Collected 2000, Marge Regel collection.
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Figure 7. White barite rose, New Raymer, Colorado, Dan Kile photo and collection.
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Figure 8. Calcite coating barite, Taxco, Guerrero, Mexico. Jim and Imelda Klein collection at the Denver Gem and Mineral Show® 2018.
About the Denver Gem & Mineral Show
In the 1950s, different gem and mineral clubs and societies put on their own Gem and Mineral show, but in the 1960s the Denver Gem and Mineral show was born when the organizations combined their small shows into one.
The Denver Gem and Mineral Show, which began in 1967, has grown over the years into the second largest show in the United States and has numerous satellite shows that have sprouted up around the area. Through the time the show has been developing, exhibits from a number of regional and national museums have remained key attractions along with other activities.
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The Greater Denver Area Gem & Mineral Council is a non-profit 501(c)(3) corporation organized exclusively for charitable, educational, and scientific purposes.
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Dealers
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If you are interested in dealer space, please email us and the selection committee will send you an application. Please understand that we are in a much smaller space, and it is unlikely that we will be able to accommodate every request. We value your support and appreciate your patience as we regain our footing and work toward a bigger and better Denver Gem & Mineral Show.
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