As summer days are in full swing, Oklahomans are taking part in adventures across the state.
For all you that nerd out over that cool rock you found, and we say nerd out in the most loving way possible, Oklahoma has some spots you can find crystals and stones.
Here’s where to find some new additions to your rock collections in Oklahoma.
Salt Plains State Park
A family digs for crystals at the Salt Plains National Wildlife Refuge.
One of the most popular options for gem-lovers is to head to Salt Plains State Park and the Salt Plains National Wildlife Refuge just north of the town of Jet.
Here, you can find hourglass-shaped selenite crystals just under the salt plain, which is all that is left of an ocean that covered Oklahoma in prehistoric times. Oklahoma is the only place in the world where these hourglass selenite crystals can be found.
The crystal dig area is found southwest of the lake in the wildlife refuge, and is open from April 1 to Oct. 15 from sunrise to sunset.
Ouachita Mountains
The Ouachita Mountains, which stretch across southeast Oklahoma and west-central Arkansas, emerged around 300 million years ago and once rivaled the present-day Rocky Mountains, according to TravelOK.
The area is home to quartz and other minerals, making it popular for rockhounding. The quartz crystals can form in various colors, according to rockhounding.org.
Noble, Oklahoma
Named Oklahoma’s state rock, rose rocks are an aggregate of barite and sand that form to look like fully bloomed roses. These rocks occur in outcrops of Garber sandstone from Guthrie to Pauls Valley, especially east of Noble and Norman, according to the Oklahoma Historical Society.
In fact, Noble is known as the “Rose Rock Capital of the World,” and the unique rocks can often be found by searching ditches and gullies where road construction or erosion has taken place. They’ve also been found at Lake Thunderbird State Park, and Lake Stanley Draper when the water is low.
Similar rosettes occur in Kansas, California and Egypt.
Black Mesa State Park
In the far, northwestern corner of Oklahoma’s Panhandle, you can find Black Mesa State Park and Black Mesa Nature Preserve. Taking its name from the black lava rock that coated the mesa around 30 million years ago, here you’ll find Oklahoma’s highest point — a plateau rising 4,973 feet above sea level inside the nature preserve.
Also inside the nature preserve, you can go looking for petrified wood and various fossils, according to rockhounding.org.
This article originally appeared on Oklahoman: See the best spots in Oklahoma to hunt, dig for crystals and rocks