$195Median
124Sold (12 mo)
$30Last sale
Updated 3d ago
Gypsum
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An aesthetic cluster of brown slightly translucent gypsum crystals without matrix. Some of these show and hourglass structure on the interior typical of the locality. No points of attachment and in great condition. The specimen comes with a previous label from the collection of Ray DeMark. The Great Salt Plains of Alfalfa County, Oklahoma, formed through the evaporation of an ancient inland sea that left behind extensive salt deposits and a shallow saline water table. Beneath the flat, shimmering plains lies the Blaine Formation, a geological layer rich in sulfate minerals from which groundwater dissolves and redeposits material. As groundwater mixes with iron-rich clay and sand near the surface, it evaporates and crystallizes around sand grains, producing the unique hourglass-shaped selenite crystals found nowhere else in the world. Historically, this area has attracted mineral collectors and tourists since the early 20th century, culminating in the establishment of the Salt Plains State Park and National Wildlife Refuge, which famously allows public digging for these remarkable crystals.
Product details
Current owner
Unknown Owner
- Acquired
- Oct 2026
- Price paid
- $45.00
Previous owners
| Date | Collector | Acquisition price |
|---|---|---|
| — | Weinrich Minerals | Not disclosed |
Learn more
Mineral guide
Learn about Gypsum
a diverse sulfate featuring selenite, satin spar, alabaster and desert roses; prized for clarity, dramatic twin forms, and collectible rarity.Regional guide
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