Colorado’s mountains and streams hold many hidden gems. Garnets are some of the most sought-after stones in the state. These deep red crystals stand out against the rocky terrain.

Locals have been finding garnets here since the mining days. Some areas are better known than others for these special stones. You might spot them in creek beds or embedded in certain rock types.

This guide will take you through the best garnet hunting spots across Colorado. We’ll cover both easy-to-reach areas and some off-the-beaten-path locations. All you need is a bit of knowledge about where to look and what to look for.

How Garnet Forms Here

Garnet forms deep underground when rocks get squeezed and heated during metamorphism. Think of it like baking cookies – but instead of dough, you’ve got minerals like aluminum, iron, and silica getting cooked under intense pressure.

When these minerals reach temperatures around 400-700°C, they start rearranging their atoms into garnet’s distinctive crystal structure.

What’s cool is that garnets often grow by pushing other minerals out of the way! That’s why they form those perfect geometric shapes.

Most garnets need high pressure too, which is why they’re usually found in rocks that were once buried miles beneath the surface. The slower they grow, the bigger and clearer they become – some taking millions of years to reach their full size.

Types of Garnets

Garnets are captivating gemstones that showcase an impressive range of colors and varieties, each determined by their unique chemical composition. Understanding these differences helps in identifying the stone’s value.

Almandine Garnet

Almandine garnet stands out with its rich, deep red to reddish-brown color. The stone sometimes shows hints of orange or brown, making each piece unique. Its color intensity remains consistent throughout the stone, creating a beautiful depth that catches the eye.

The crystal structure of almandine follows a perfect cubic pattern, forming well-defined shapes with smooth faces. This symmetry contributes to its striking appearance and helps light bounce through the stone evenly.

What makes almandine special is its high iron content, which gives it a higher specific gravity than other garnets. This means it feels slightly heavier in your hand compared to similar-sized stones. Its refractive index of 1.74 to 1.83 creates excellent brilliance and fire.

Most almandine garnets are remarkably clear, though some may contain natural inclusions that create interesting patterns. These patterns can add character to the stone without affecting its overall beauty or durability.

Pyrope Garnet

Pyrope garnet captivates with its intense red-to-purplish-red color. The color is so pure and vibrant that some specimens have earned the nickname “Cape Ruby.”

This stone has excellent clarity, rarely showing visible inclusions. When present, some inclusions can create a fascinating star effect called asterism, where a six-pointed star seems to float on the surface.

The stone appears especially vivid when cut into clean, geometric shapes that maximize light return.

Some pyropes show a subtle color shift, appearing slightly different under natural and artificial light. This subtle change adds to their charm and makes each stone unique.

Their exceptional clarity and lack of internal flaws make them particularly appealing to collectors.

Spessartine Garnet

Spessartine garnet showcases a stunning range of orange colors, from bright mandarin to deep reddish-orange. The most valued pieces display a pure, vivid orange. This distinctive coloring comes from manganese in its chemical makeup.

When cut properly, spessartine exhibits bright flashes of light and exceptional sparkle. Some stones show a subtle “sugar-like” texture that creates a soft, internal glow.

Pure spessartine is rare in nature, making high-quality specimens particularly valuable. Most stones contain trace elements that create subtle color variations.

The stone’s transparency ranges from completely clear to slightly cloudy. Clear specimens are highly prized, but some collectors prefer stones with slight cloudiness that creates an interesting depth effect.

Andradite Garnet

Andradite garnet displays the widest color range of all garnets. Colors span from bright green to yellow, brown, and black. The green variety, known as demantoid, is particularly treasured for its brilliant, emerald-like color and exceptional sparkle.

This stone has the highest dispersion rate of all garnets, even higher than diamond. This means it breaks light into rainbow colors more effectively, creating fascinating fire and brilliance.

Some andradite garnets contain unique internal features called “horsetail” inclusions. These fine, needle-like patterns are actually desired by collectors and add to the stone’s value.

The stone’s surface has a bright, glass-like luster that enhances its natural beauty. Some specimens exhibit unique optical features such as asterism (star-like patterns) and chatoyancy (cat’s eye effect), which further enhance their visual appeal.

Grossular Garnet

Grossular garnet comes in an amazing range of colors – from green and yellow to pink, orange, and even colorless. The most striking feature is the presence of internal swirls and streaks that create unique patterns within each stone.

The stone’s surface has exceptional brilliance that rivals expensive gems like emeralds. Light bounces through it beautifully, creating bright flashes and sparkles.

A special variety called Mint Garnet glows under ultraviolet light, creating an otherworldly effect. This unusual property makes it particularly interesting to collectors. The stone’s clarity is typically excellent, with few visible impurities.

The presence of trace elements like chromium and vanadium creates its varied colors. These elements mix in different amounts, resulting in subtle color variations that make each stone unique.

Some pieces show color zoning, where different shades blend together in distinct patterns.

Uvarovite Garnet

Uvarovite garnet displays a striking emerald-green color that remains consistent in all specimens. Unlike other garnets, where green hues may arise from chromium impurities, uvarovite’s green is inherent to its composition.

Instead of forming large crystals, uvarovite typically grows in clusters of tiny crystals. These clusters, called druzy, create sparkling surfaces that look like green sugar coating the rock beneath.

Under ultraviolet light, it shows an unexpected red glow, adding another layer of interest for collectors. This fluorescence is a unique feature not commonly found in other garnets.

These stones rarely grow large enough for traditional gem cutting. However, their natural crystal formations are so beautiful that they’re often left in their original state. The tiny crystals catch light from multiple angles, creating a dazzling display.

Rhodolite Garnet

Rhodolite garnet stands out with its beautiful purple-red to raspberry-pink colors. The colors can shift between purple and red depending on the lighting, creating an interesting play of hues. This color range makes it distinctly different from the deeper reds of other garnets.

The stone’s clarity is typically excellent, with very few internal features visible to the naked eye. The surface has a glass-like shine that enhances its natural beauty.

What makes rhodolite special is its mixed composition of two different garnet types. This mixture creates its unique color range and optical properties. The stone often shows stronger color saturation in its center, fading slightly toward the edges.

Rhodolite garnet is particularly valued for its vibrant colors that can mimic more expensive gemstones like rubies and amethysts, making it a popular choice among collectors and jewelers alike.

Hessonite Garnet

Hessonite garnet showcases warm honey-to-cinnamon colors, ranging from golden yellow to deep reddish-brown. Some pieces display hints of purple, creating complex and appealing color combinations.

Inside the stone, you might find interesting patterns created by tiny needle-like crystals. Unlike many gems where inclusions reduce the value, these internal features are appreciated in Hessonite. They create unique patterns that make each stone one-of-a-kind.

The stone’s transparency varies from crystal clear to slightly cloudy. This variation can create interesting effects, especially when light passes through the stone. Some pieces show a subtle glow that seems to come from within.

High-quality hessonite stones are relatively uncommon, especially in larger sizes. Their warm colors and unique internal features make them particularly interesting to collectors.

Tsavorite Garnet

Tsavorite garnet displays a brilliant green color that ranges from bright lime to deep forest green. This stunning color comes from tiny amounts of chromium and vanadium in the stone.

The green is so pure and vibrant that it often matches or surpasses the color of fine emeralds. The surface has a glass-like shine that makes the stone look alive with movement.

Each tsavorite has its own personality in terms of color depth and brightness. Some stones show subtle color changes under different lighting, while others maintain a consistent deep green.

Star Garnet

Star garnet shows a fascinating light pattern that looks like a star floating on its surface. This effect, called asterism, comes from tiny needle-like crystals inside the stone. The star usually has four or six rays that move as you turn the stone under light.

The stone’s color is typically deep red to purple-red, often with brown undertones. When polished into a smooth, rounded shape, the star effect becomes more prominent.

The best specimens show sharp, well-defined star rays against a rich, even background color. These stones are quite special because not all garnets can form stars.

The right conditions during formation must exist for the star effect to develop. The tiny crystals inside must align perfectly to create the star pattern. The star effect is natural and permanent – it won’t fade or change over time.

What Rough Garnets Look Like?

Garnets display unique identifying traits when found in their raw, natural state. Look for these distinguishing features:

Look for Distinctive Angular Shapes

Raw garnet typically forms in dodecahedral or trapezoidal crystal shapes. Think of it like tiny, naturally-formed geometric shapes.

Unlike smooth river rocks, rough garnets have sharp edges and flat faces. Even when broken, they tend to maintain these angular patterns. You’ll often spot them as chunky, block-like crystals that look like they’ve been roughly carved.

Check the Color Range and Transparency

Garnets aren’t just red! Look for deep wine colors, but also keep an eye out for orange-brown, green, or even black varieties.

Hold it up to light – rough garnets often show some translucency at the edges, even if the center seems opaque.

Examine the Surface Texture

Raw garnets have this unique, almost greasy-looking surface luster. Not shiny like glass, but more like wet plastic.

Run your finger over it – you should feel a smooth yet slightly waxy texture. If it’s been weathered, the surface might be slightly pitted or rough, but you’ll still see that characteristic luster in protected areas.

Test the Hardness and Toughness

Here’s a quick field test: garnets can easily scratch a penny but won’t scratch quartz. They’re surprisingly heavy for their size – noticeably heavier than a similar-sized piece of quartz or feldspar. Don’t be fooled by lighter stones that look similar!

A Quick Request About Collecting

Tips on Where to Look

To increase your chances of finding garnets, focus your search on these favorable areas:

Metamorphic Rock Outcrops

Look for dark-colored metamorphic rocks, especially schist and gneiss. These rocks often have visible layers or bands.

Garnets appear as dark red or brownish-red crystals embedded in the rock. Common near hiking trails and road cuts where metamorphic rocks are exposed.

Stream Beds & Gravel Banks

Check gravel deposits in streams, especially after heavy rains. Garnets are heavier than most minerals, so they concentrate in stream bends where water slows down.

Use a pan or sieve to sort through the gravel, keeping an eye out for the distinctive reddish crystals that glimmer when wet.

Pegmatite Areas

Search around pegmatite formations, which are coarse-grained igneous rocks that sometimes form large crystal pockets where beautiful garnet specimens can be found nestled among other minerals like mica and feldspar.

These areas often have scattered surface rocks and exposed cliff faces that weather over time, releasing garnet crystals.

Old Mining Areas

Explore permitted public mining dumps and tailings piles near historical mica or feldspar mines, where garnet was often discarded as a byproduct during past mining operations and can still be found in abundance among the leftover material.

Some Great Places To Start

Here are some of the better places in the state to start looking for garnet:

Ruby Mountain

Ruby Mountain is a light-colored rocky hill near Nathrop. It formed about 30 million years ago when hot molten rock called rhyolite pushed up through older granite. This special rock has tiny holes or “vugs” where minerals grew as the rock cooled.

Garnet crystals can be found inside these small holes throughout the rhyolite. Most garnets here are small, about the size of a grain of rice, and have a deep red color. The best spots to hunt for garnets are on the eastern slopes, as the western side is private property.

Many rockhounds search the broken rocks at the base of cliffs where pieces have fallen down over time. Ruby Mountain also offers other treasures like topaz crystals and obsidian nodules called “Apache Tears.”

The mountain’s unique geology makes it a popular spot for mineral collectors who carefully break open the rhyolite to find the tiny garnets hidden inside.

Sedalia Mine

Sedalia Mine lies about four miles from Salida. This historic site operated from 1881 to 1918, producing copper, zinc, lead, silver, and gold. Today, it attracts mineral enthusiasts for its remarkable almandine garnets.

The mine sits within ancient rocks that were once sea sediments, now transformed by intense heat and pressure. These metamorphic rocks include special types called garnet-cordierite-amphibole gneiss and garnetiferous quartz-mica schist.

Almandine garnets here can grow incredibly large. Their well-formed dodecahedral shapes make them prized specimens.

Collectors often search the mine’s waste dumps and slopes where weathering has exposed these gems. Particularly productive areas include the ground south of the No. 2 adit portal and sections with pegmatite intrusions.

Jefferson Area

Jefferson County stretches along the eastern edge of the Rocky Mountains in Colorado. This area serves as a bridge between the Great Plains and the mountains, creating diverse landscapes from gentle foothills to steep terrain.

The county’s complex geology shows evidence of powerful forces that shaped the land over millions of years. These forces created the famous Red Rocks Amphitheatre and the distinctive hogback ridges along the mountain front.

Garnets appear throughout the county’s metamorphic rocks, especially in areas with schist and gneiss. Good hunting spots include the Douglass Mountain Road area, where dark reddish-brown to black garnets embed in metamorphic rocks.

Another promising location is Ralston Creek in the Ralston Buttes Mining District, known for its folded and faulted formations. Genesee Mountain offers yet another opportunity, with garnets forming where igneous dykes cut through older rocks.

Lake George

Lake George sits in the heart of Colorado’s Rocky Mountains. This small community attracts rockhounds from all over due to its amazing mineral wealth.

Tectonic shifts and ancient volcanic activity created perfect conditions for minerals to concentrate here. Garnets can be found embedded in metamorphic rocks throughout the Lake George area.

For the best chance of finding garnets, explore the numerous pegmatite outcrops accessible via hiking trails and old mining roads. Road cuts and natural erosion features that expose schist and gneiss also make promising search areas.

Adventurous collectors sometimes check abandoned mining sites in the region, which have historically produced garnet specimens. The area is also famous for topaz, amazonite, and smoky quartz.

Willow Creek

Willow Creek runs for about 35 miles through Grand County in Colorado. It starts in the Arapaho National Forest and flows into Willow Creek Reservoir before joining the Colorado River near Granby. The creek winds through peaceful meadows and thick forests, making it less crowded than many rockhounding spots.

The land around Willow Creek contains a mix of metamorphic and igneous rocks. Granite intrusions and pegmatite veins cut through the older rocks, creating mineral-rich areas. Years of water flow have carved the creek bed, sometimes exposing gemstones and minerals to eager rockhounds.

Garnets occur in several places along Willow Creek, especially in the metamorphic rocks. The creek’s natural erosion helps wash out smaller specimens, while larger garnets remain embedded in the host rock.

Good places to search include the pegmatite veins near Willow Creek Reservoir and the upper reaches of the creek where metamorphic rocks are exposed. Established trails provide access to these areas.

Places Garnet has been found by County

After discussing our top picks, we wanted to discuss the other places on our list. Below is a list of the additional locations along with a breakdown of each place by county.