History | Information

Unearthing Ellensburg Blue Agate: A Gem of Central Washington

December 21, 2023

Hidden away in the heart of Central Washington lies a sparkling secret of nature, a gem that has captured the imaginations of collectors, lapidaries, and jewelry enthusiasts for generations. Known as the Ellensburg Blue Agate, this exquisite stone is a true testament to the beauty that lies within the core of Central Washington.

The Ellensburg Blue Agate is a variety of chalcedony- a microcrystalline form of quartz that exhibits a range of stunning colors and patterns. What sets the Ellensburg Blue apart is its distinct shade of blue, ranging from a delicate sky blue to a rich cobalt hue. These captivating colors are the result of the presence of trace amounts of copper within the stone.

While agates are found in various locations around the world, the Ellensburg Blue Agate is uniquely associated with the region surrounding Ellensburg, Washington. It’s an integral part of the Pacific Northwest’s geological history, with a million year old story.


The formation of the Ellensburg Blue Agate is a testament to the intricate dance between geological processes and the Earth’s elements. Around 50 million years ago, the region that is now Washington State was characterized by volcanic activity, shifting tectonic plates, and the presence of ancient seas.

As volcanic lava flows cooled and solidified, they created cavities within the rock. Over time, these cavities were filled with mineral-rich solutions containing silicon dioxide (the main component of quartz) along with trace elements such as copper. The slow deposition of minerals within these cavities led to the formation of agates, each with its unique coloration and patterns.

Fast forward to the present day, and the forces of erosion, uplift, and glaciation have revealed these agates, scattered throughout the area’s landscapes and riverbeds. The most prized among these discoveries are the captivating blue agates that have become associated with the town of Ellensburg. Click here for Rock Hounding locations.

The Ellensburg Blue Agate’s allure lies not only in its stunning colors but also in the stories it carries. Collectors and lapidaries are drawn to the stone’s rarity and the challenge of unearthing these hidden treasures from the rugged terrain. The agate’s captivating hues and its translucency that allows light to pass through, creating a captivating play of color and depth.

Lapidaries and jewelry artisans have embraced the Ellensburg Blue Agate for its versatility. It can be transformed into a variety of jewelry pieces, from delicate earrings that showcase the stone’s light, dream-like beauty to intricate pendants that capture its rich shades. The stone’s connection to Central Washington also adds a layer of sentimental value for those who call the region home.

Ellensburg has embraced the stone as part of its identity. The Ellensburg Blue Agate has become an emblem of local pride, symbolizing the town’s rich geological heritage and the treasures it holds beneath the surface. The town celebrates this gem through its historical showcase at the Kittitas Historical Museum, events, and even its local markets, which showcases a stunning collection of these precious stones. Click here for Rock Hounding locations.

Scientific information:

You will notice that a Blue Agate is extremely hard by its mineral structure.

When tested on a MOHs scale of 1 – 10 (10 being the hardest), a Blue’s hardness will come back 6.5 or harder. Gems found on or around the earth’s surface are often oval-shaped and small

  • Mineral: Microcrystalline Quartz, Chalcedony Group
  • Chemical Composition: SiO2
  • ColorBlue, Banded Blue, Vivid Blue (Mostly Dyed)
  • Hardness: 6-1/2 to 7 on the Moh Scale
  • Specific Gravity: 2.58 – 2.64
  • Refractive Index: 1.530 – 1.539
  • OpacityTranslucent to Opaque


This beautiful blue gem is linked to physical, emotional, and spiritual meanings and remedies. First, the color of the stone is representative of feelings of calmness and tranquility. It’s also cool to the touch, which many believe will aid in helping the stone’s bearer be peaceful and collected.

The stone also has a number of other meanings, many of which have to do with a sense of renewal. It is said to symbolize and channel unity, cleansing, hope, protection, harmony, optimism, positivity, appreciation for the natural world, purification, joy, and truth.

Blues are linked to the heart chakra, which is most notably associated with one’s energy levels as well as giving and receiving love. Aside from the heart chakra,Blue Agate is strongly connected to the throat chakra. The stone is often worn or kept in a pocket by public speaking professionals or those who require extensive use of their voices, such as singers, actors, and musicians.


Blue Agate, while not a conventional birthstone, can be particularly advantageous for individuals born from the spring equinox through the remainder of spring. Blues also hold associations with the Zodiac signs of Gemini and Pisces. This gem can prove to be most beneficial to Geminis, who are often characterized as rapid thinkers with a unique charm, and may occasionally exhibit moodiness or anxiety.

Whether you’re a geology aficionado, a jewelry enthusiast, or simply someone who appreciates the wonders of nature, the Ellensburg Blue Agate offers a glimpse into the intricate beauty that lies beneath the Earth’s surface. It’s a reminder that even in the modern age, nature still holds secrets waiting to be discovered, and that Central Washington is as rich and vibrant as the agates it reveals.

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