Rock Discoveries

Rockhounding in Oregon: Discovering the State’s Unique Treasures

Oregon as a Rockhounding Destination

Are you looking for a unique and exciting adventure in Oregon? Are you fascinated by the Earth’s natural treasures and love collecting rocks and minerals?

Then, look no further because Oregon is the perfect destination for rockhounding enthusiasts. The state’s geologic diversity and vast public land ownership make it the ideal place to find some of the rarest, most beautiful, and sought-after rocks and minerals.

Oregon’s Geologic Diversity and Public Land Ownership

Oregon is a treasure trove for rockhounds thanks to its geological diversity. The state’s diverse landscape boasts a range of geological formations, including ancient rocks and sediments, volcanic rocks, metallic deposits, and unique minerals.

These formations have been shaped and transformed by various natural processes over millions of years. What’s more, Oregon has an abundance of public lands that are open for recreational rockhounding.

These lands are managed by state and federal agencies, including the Bureau of Land Management (BLM) and the U.S. Forest Service, offering ample opportunities for rockhounds to explore and collect rocks and minerals.

Popular Rocks and Minerals Found in Oregon

Oregon is home to some of the world’s most stunning and fascinating rocks and minerals. Here is a list of some of the popular ones you can find in the state:

Agates: Agates are a type of chalcedony that come in a variety of colors and patterns.

They are commonly found in Oregon’s coastal beaches, where they have been polished by the ocean waves. Jasper: Jasper is a type of chalcedony that is usually opaque and comes in many colors.

Oregon’s forests, especially those near streams draining the Western Cascade Mountains, are excellent locations for finding jasper. Oregon Sunstone: Oregon sunstone is a unique variety of plagioclase feldspar that sparkles like the sun.

The Oregon Sunstone Public Collection Area is the only area in the world where you can collect this precious gemstone. Obsidian: Obsidian is a volcanic glass that is shiny and sharp.

Obsidian flows and deposits are abundant in eastern and central Oregon. Thundereggs: Thundereggs are round rocks that contain agate cores.

They are found in areas like Glass Butte and the Willamette River. Petrified Wood: Petrified wood is a type of fossil that has been replaced by minerals over time.

Specimens can be found in Fossil, OR and other locations in central eastern Oregon. Quartz: Quartz is a common mineral that comes in various colors.

It is frequently found in many parts of Oregon, including near placer gold deposits. Fossils: Oregon’s geological history spans millions of years, and fossils from different time periods can be found across the state.

Placer Gold: Placer gold is found in the sand and gravels of streams and rivers. The best place to search for it is in central and eastern Oregon, where many gold deposits exist.

Locations for Rockhounding in Oregon

Now that you know about some of the popular rocks and minerals found in Oregon, here is a list of locations that are perfect for rockhounding:

Glass Butte: Located in the High Desert of central Oregon, this area is famous for its thundereggs. Oregon beaches: The beaches along the Oregon coast are rich with agates, jasper, and other interesting rocks.

Willamette River: This river has yielded some of the largest Oregon sunstones ever found. You can also find thundereggs and many other types of rocks and minerals in the area.

Thundereggs: Other than Glass Butte, there are other locations in central and eastern Oregon that are famous for thundereggs, such as Richardson’s Ranch and Priday Ranch. Oregon Sunstone Public Collection Area: Located in the high-desert region of southeastern Oregon, this area is the only place where you can collect Oregon sunstones.

Fossil, OR: Named after the abundance of fossils found in the area, this location is great for collecting petrified wood. You can also find many other locations across the state, including areas around Antelope, Prineville, Hart Mountain, Lakeview, and Succor Creek.

Regulations and Restrictions on Rock Collecting in Oregon

It is important to know and follow the regulations and restrictions on rock collecting in Oregon. The BLM and U.S. Forest Service have different rules on collection limits and restricted items that vary depending on the location.

For example, in most BLM lands, rockhounds are allowed to collect up to 25 pounds of rocks and minerals per day, with a limit of 250 pounds per year. Meanwhile, in most U.S. Forest Service lands, rockhounds are allowed to collect up to one gallon per day and three gallons per year.

In addition, some areas have special restrictions on specific rocks and minerals. For example, collecting Oregon sunstones is not allowed in some portions of the public collection area, or some areas may require a permit to collect certain minerals.

Be sure to check the regulations and restrictions for each location you plan to visit before going.


Oregon is truly a rockhounds paradise. With stunning scenic views, a vast array of geological formations, and accessible public lands, this state offers endless opportunities to discover some of the world’s most stunning and fascinating rocks and minerals.

Be sure to follow the regulations and enjoy your rockhounding adventure in Oregon.

3) Jasper in Oregon

Jasper is a type of chalcedony, just like agate, but with a more opaque appearance and different formation process. It is a beautiful and versatile stone that comes in many colors and patterns, making it a popular choice for jewelry and decorative items.

Oregon is one of the best places to find jasper, as the state has a variety of locations that produce different types of this stunning stone.

Differences between Jasper and Agate

While jasper and agate may look similar to the untrained eye, there are some key differences between the two stones. Jasper is more opaque and typically comes in solid colors or patterns, while agate is more translucent and often has banding or stripes.

Additionally, jasper is formed from volcanic ash or sediment, while agate forms in cavities of rocks or bubbles of lava.

Types of Jasper Found in Oregon and their Unique Appearance

Oregon has several types of jasper that are found in different locations and have unique appearances. Here are a few examples:

– Biggs Jasper: This type of jasper comes from the Biggs junction area in central Oregon and is characterized by its bold reds, greens, and yellows.

These colors are thought to be a result of iron and manganese in the rocks. – Deschutes Jasper: Found along the Deschutes River in central Oregon, this jasper is known for its earthy tones and swirling patterns.

It is typically gray, beige, or brown and has interesting inclusions such as dendrites and veins. – Owyhee Jasper: The Owyhee Mountains in eastern Oregon are a source of this unusual jasper.

It is often blue-gray to green-gray, with shades of black and red, and has a unique ‘picture stone’ appearance due to patterns and colors that resemble paintings.

Best Places to Find Jasper in Oregon

The Willamette Valley is known for producing a lot of high-quality jasper in the state. One of the best places to find jasper is on the gravel bars of the Willamette River and its tributaries.

These rocks are frequently turned over by the river, providing new opportunities for rockhounds to collect. Another excellent location for jasper hunting is in central Oregon’s Deschutes River canyon.

Here, the river has cut through layers of basalt and exposed pockets of jasper, allowing rockhounds to find pieces that have been brought down to the river’s edge.

4) Oregon Sunstone

Oregon sunstone is a unique variety of plagioclase feldspar that is found exclusively in the state. What sets this stone apart from other types of feldspar is its schiller effect, which gives it a unique sparkling appearance.

This effect is caused by microscopic copper inclusions that reflect light in a particular way, producing an almost metallic, glittering sheen.

Definition and Features of Oregon Sunstone

The composition of Oregon sunstone is what makes it different from other types of feldspar. The presence of copper in the plagioclase feldspar gives the stone its unique schiller effect, which shimmers and glows in the light.

This effect can vary depending on the size and orientation of the copper inclusions, with some stones having a more intense sparkle than others. The colors of Oregon sunstone can also vary widely.

Most stones are a light yellow or reddish-brown, but some can be almost clear, while others have a more intense red or green hue. The stone’s transparency can also vary, with some being quite clear, while others are more milky and opaque.

Best Places to Find Oregon Sunstone in Oregon

Opal Butte, located in Morrow County, is known for producing some of the highest quality Oregon sunstones in the state. This area is one of the few places where you can find ‘Dichroic’ sunstones, which change color depending on the angle of the light.

The Oregon Sunstone Public Collection Area, located in southeastern Oregon, is another excellent location for finding Oregon sunstone. This area is open to the public and managed by the BLM, allowing visitors to collect sunstones during designated times and within specific limitations.


Jasper and Oregon sunstone are just two of the many beautiful and unique rocks and minerals that can be found in Oregon. Whether you are an experienced rockhound or a beginner, the state has a lot to offer in terms of geological diversity and accessible public lands.

So, pack your bags and get ready to explore the wild, rugged, and beautiful lands of Oregon.

5) Obsidian in Oregon

Obsidian is a volcanic glass that is formed when lava cools quickly, trapping minerals and gases inside the rock. It is a fascinating and beautiful stone that comes in a variety of colors and patterns.

Oregon is known for its abundance of obsidian, which has been used by native tribes for centuries to make tools, weapons, and ceremonial objects.

Definition and Characteristics of Obsidian

Obsidian is a type of volcanic glass that is dark-colored and shiny. It is formed as lava cools quickly, trapping gases and minerals inside the rock.

The rapid cooling process results in a unique texture that can vary widely depending on the location and conditions under which it was formed. Obsidian is almost always black, but it can also be brown, gray, green, or red.

One of the most fascinating aspects of obsidian is its fracturing properties. Obsidian has been known to fracture into very sharp pieces, making it an excellent material for cutting and piercing.

These properties made obsidian a valuable resource for many cultures, including Native American tribes, who used it to make knives, spear points, and arrowheads.

Best Place to Find Obsidian in Oregon

The Glass Butte and Dendrite Butte are among the best places to find obsidian in Oregon. Glass Butte is located in central Oregon and has a large deposit of obsidian that is particularly attractive to rockhounds due to its varied colors and high-quality specimens.

Dendrite Butte, located in southeastern Oregon, is another location where rockhounds can find obsidian of exceptional quality, often with interesting natural patterns or inclusions.

6) Thundereggs in Oregon

Thundereggs are round rocks that are formed when silica-rich fluids fill cavities in volcanic rocks. They are Oregon’s state rock and are prized for their exquisite designs, color variation, and often precious stones, such as agates, jasper, and opals, found at their core.

These unique stones can only be found in a few locations worldwide, making Oregon a prime destination for rockhounding enthusiasts.

Definition and Characteristics of Thundereggs

Thundereggs are a type of rock that is formed when volcanic activity ejects molten lava that cools and solidifies on the surface. When fluid-rich volcanic ash and gas become trapped inside the rock, it can create a hollow cavity, which can be filled with silica-rich fluids under certain specific conditions.

Over time, these fluids can create beautiful and unique crystal formations inside the cavities, forming what we know as thundereggs. Thundereggs are prized for their smooth and round exterior, which is usually solid-colored or patterned with colorful bands.

The interior is where the real magic happens, with delicate and intricate crystal formations, colors, and patterns. Thundereggs can contain a variety of precious stones, including agates, jasper, and opals, making them sought after by collectors and jewelry makers alike.

Best Places to Find Thundereggs in Oregon

Central and southeastern Oregon is known for producing some of the highest quality thundereggs in the world. The following counties are some of the best places to find thundereggs in Oregon:

– Crook County: The Richardson’s Ranch is famous for its thundereggs, which come in various colors and sizes.

– Jefferson County: The Ashwood area is known for its large thundereggs, some of which have yielded some of the most beautiful opals in the world. – Malheur County: The Opalite area is famous for producing some of the most uniquely patterned and colored thundereggs in the state.

– Wasco County: The Saddle Mountain area is a popular spot to find thundereggs, with many specimens containing jasper and agate inclusions. – Wheeler County: The area around the town of Mitchell is known for producing thundereggs with delicate and intricate crystal formations.


Oregon is a treasure trove for rockhounds, offering an abundance of unique and exquisite stones to discover and collect. Obsidian and thundereggs are just two examples of the beautiful and unique rocks and minerals that can be found in the state.

Whether you are a seasoned rockhound or a beginner, the diverse geology and public land ownership in Oregon make it an ideal location for a rockhounding adventure. So, pack your hammer, chisel, and bucket, and get ready to explore the wild and rugged lands of Oregon.

7) Petrified Wood in Oregon

Petrified wood is a type of fossilized wood that has been replaced by minerals over millions of years. This process creates unique patterns and colors, making it a popular choice for collectors and jewelry makers.

Oregon has a long history of petrified wood formation and is known for producing some of the most beautiful specimens in the world.

Definition and Characteristics of Petrified Wood

Petrified wood is a type of fossil that forms when trees are buried under sediment or volcanic ash. Over time, minerals in the surrounding sediment or ash replace the organic material in the wood, preserving its structure in stone.

Petrified wood can range in color from white to black, depending on the minerals that replaced it. The patterns and colors in petrified wood are determined by the types of minerals present in the local soil, and each specimen is unique.

Petrified wood is an ancient material that can be found all over the world, including Oregon. These fossils are a testament to the Earth’s geological history

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