Indiana, bordered by Illinois, Kentucky, Ohio, and Michigan, is a treasure trove for rockhounds seeking moonstone. The state’s diverse geology offers unique opportunities for enthusiasts to uncover this stunning gemstone.

However, many find themselves overwhelmed by the vast options and unsure where to start. This article simplifies your search by pinpointing the best locations in Indiana to find moonstone, saving you time and energy.

Join us as we explore the top spots and equip you with the knowledge to enhance your rockhounding adventures!

How Moonstone Forms Here

Moonstone starts as feldspar, a mineral made of aluminum and silicate. As the rocks cool slowly, two types of feldspar—orthoclase and albite—separate into thin layers. As the layers solidify, they create the stone’s unique internal structure.

The stone’s color, usually milky white with a blue or peach glow, depends on the thickness of these layers and how they catch the light.

When light enters the stone, it scatters between these layers, producing a moonstone’s signature shimmering glow called adularescence. This optical effect makes it appear as if light is floating beneath the surface.

Over millions of years, plate tectonics push the moonstone deposits closer to the surface where they can be mined. The rarity and specific geology needed to create moonstones add to their mystique as one of the world’s most magical gemstones.

The Types Of Moonstone

Our state is a treasure trove of stunning moonstone varieties. These natural wonders come in various forms, each with its own unique charm and allure:

Blue Moonstone

Blue Moonstone is known for its transparent to translucent body with a floating blue sheen on the surface. This sheen, called adularescence, is caused by light reflecting off layers of minerals within the stone.

The most prized Blue Moonstones have a strong blue color and perfect clarity. This makes them stand out from other types, which might be colorless or milky.

What’s special about Blue Moonstone is its ethereal glow. The adularescence creates a soft, shimmering light beneath its surface. This unique optical effect, combined with its rarity, makes it popular among collectors and jewelry enthusiasts.

Rainbow Moonstone

Rainbow Moonstone is famous for its labradorescence, a colorful sheen that shows a spectrum of colors like blue, yellow, orange, and purple. This effect is especially striking against its white body color, giving it a radiant appearance.

Unlike traditional moonstones, Rainbow Moonstones’ play of colors is more vivid and varied. It’s often confused with labradorite but can be distinguished by its pearly sheen and more transparent body.

Some Rainbow Moonstones contain inclusions of black tourmaline, visible in untreated stones. This gemstone gained popularity during the Art Nouveau period and continues to be favored in modern jewelry for its unique optical effects.

Pink Moonstone

Pink Moonstone shows a delicate pink or peach hue, ranging from honey to beige. Its color is soft and subtle, setting it apart from other moonstones with more vibrant shades.

This stone has a pearly or vitreous luster and is generally translucent. High-quality Pink Moonstones often display a white sheen on the surface. Some specimens can even show a cat’s eye or star effect due to their unique internal structure.

Pink Moonstone is one of the rarest varieties of moonstone. Its delicate color and unique optical effects make it highly sought after. Unlike Pink Opal, which is more opaque, Pink Moonstone is characterized by its iridescent sheen.

Star Moonstone

Star Moonstone shows a unique optical effect called asterism, creating a four-pointed star pattern on its surface. This happens because of needle-like inclusions in the stone that reflect light in a special way.

These moonstones are usually translucent to opaque, with colors ranging from colorless to shades of blue, gray, or white. The star effect is best seen when the stone is cut into a cabochon shape.

Star Moonstone is rarer than other types, making it highly desirable. The strongest and most well-defined stars are often found in specimens from Sri Lanka.

Peach Moonstone

Peach Moonstone stands out with its soft peach or orange hue, ranging from pale to more intense shades. It has a shimmering effect called adularescence, which creates a glowing appearance under certain light.

Unlike other moonstones, Peach Moonstone’s glow is more subdued and warm-toned. It’s generally translucent to semi-transparent, allowing light to pass through and enhance its beauty.

What’s special about Peach Moonstone is its rarity. This scarcity makes it desirable among collectors and jewelry makers.

Its warm tones are particularly favored in designs aiming for a soft, romantic look. The unique color and rarity of Peach Moonstone set it apart in the world of gemstones.

Brown Moonstone

Brown Moonstone has a warm, earthy color that ranges from light honey to deep chocolate brown. It’s translucent to opaque and shows the typical moonstone glow, caused by light scattering between layers of different minerals inside the stone.

What makes Brown Moonstone unique is its rarity compared to other colors like white, gray, and rainbow. The brown color comes from iron impurities in the stone.

Brown Moonstone doesn’t show a strong play of color or iridescence like other moonstones. Its subtle beauty lies in its rich, earthy tones and soft glow. This makes it a distinctive choice for those who appreciate understated elegance in their stones.

Cat’s Eye Moonstone

Cat’s Eye Moonstone is known for its striking appearance. It has a translucent body with a narrow band of light that moves across the surface, looking like a cat’s eye. This effect, called chatoyancy, is caused by tiny needle-like inclusions in the stone.

What sets it apart from other moonstones is this cat’s eye effect. While other moonstones might have a blue sheen, Cat’s Eye Moonstone is all about this moving line of light.

The chatoyancy in Cat’s Eye Moonstone is highly sought after. It’s more valuable than standard moonstones because of how rare it is to find high-quality pieces with strong chatoyancy. This unique look makes it a favorite among collectors and stone enthusiasts.

Green Moonstone

Green moonstone captivates with its soft, pastel green hue and subtle white sheen. Unlike other moonstones, it often displays a velvety texture that’s pleasing to both eye and touch.

Each green moonstone is unique, with color variations ranging from faint green streaks to more pronounced green hues within a milky white base. This diversity means no two stones look exactly alike.

The stone’s green color comes from its high nickel content, making it a rarer find in the moonstone family. This unique composition sets it apart and makes it a favorite among collectors who appreciate its distinctive appearance.

What Rough Moonstone Looks Like

It’s important to understand what a rough moonstone looks like to know what you’re looking for. Here are a few things to keep an eye for:

Check for a Glassy or Waxy Luster

Look for a shiny surface. Moonstone usually has a glassy or waxy luster. It might not sparkle like a diamond, but it has a soft glow.

Hold it up to the light and see if it catches a gentle sheen. If you spot that smooth, silky look, you might have found one.

Assess the Density and Weight

Moonstone feels relatively light for a gemstone. If you pick it up and it feels heavier than expected, it might not be moonstone.

The specific gravity ranges from 2.54 to 2.66, so it should feel somewhat light in your hand.

Notice the Blue or White Sheen

Tilt the stone in your hand. If you notice a blue or white sheen, that’s a good sign. Moonstone has something called adularescence. This is when light reflects inside the stone, creating a soft glow.

It’s one of the key features of moonstone, so keep an eye out for that flash of color.

Look for Rounded Edges

Notice the edges. Moonstone tends to have rounded edges, not sharp ones. This is due to the way it forms in nature.

The rounded shape makes it easier to spot when you’re searching. Keep an eye out for stones with soft, curved edges.

A Quick Request About Collecting

Tips on Where to Look

When you reach the places we’ve listed below, keep these things in mind while searching:

Riverbeds and Streams

Check out riverbeds and streams. Moonstones can often be found in these areas.

They wash down from the mountains and settle in the gravel. Search along the edges, especially after heavy rain. It’s an easy way to start.

Sandy Beaches

Head to sandy beaches. Look where the sand meets rocks or pebbles. The constant movement of the water helps uncover hidden treasures.

You might find moonstones mixed in with other small stones. The search here can be fun and rewarding.

Old Quarries

Visit old quarries. These places often have piles of loose rocks and gravel where moonstones might be hiding.

The digging and blasting might have already brought them to the surface. Just a little effort and you might find something cool.

Sedimentary Rocks

Check sedimentary rock areas. Moonstones form in these rocks, so they’re likely to be around.

Look for outcroppings or places where the rocks have broken apart. The stones might be easier to spot after some weathering.

Some Great Places To Start

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

Williams Creek

Williams Creek, a small town in Marion County, Indiana, lies about 9 miles north of Indianapolis. The town is bordered to the southwest by a stream, also named Williams Creek, which flows southeast to join the White River in Marott Park.

This area, known for its sedimentary rock formations, presents an exciting opportunity for rockhounds.

The creek’s natural flow has, over time, exposed and transported various minerals, including moonstones, making them more accessible to enthusiasts.

Within Williams Creek, the best places to search for moonstones would be along the banks of the creek and in areas where the water flow has created natural deposits.

Look for spots where the water has slowed down, such as bends in the creek or areas with natural barriers, as these locations are more likely to accumulate stones and minerals. 

Exposed rock formations and sediment layers near the creek are also promising areas to explore.

Indianapolis Area

Indianapolis, the capital of Indiana, sits on a gently sloping plain along the White River. This urban area in Marion County offers a unique blend of city life and natural spaces, making it an unexpected gem for rockhounds.

The area’s geology, shaped by ancient glacial activity, creates a rich environment for stone seekers. Sedimentary deposits from the Ice Age have left behind a variety of interesting rocks and minerals.

The White River and its tributaries, like Eagle Creek and Fall Creek, are prime spots for moonstone hunting. These waterways have gradually exposed and transported various minerals over time.

For the best chances of finding moonstone, explore the riverbeds and banks, especially where smaller streams join the White River. The natural erosion process often uncovers these hidden treasures.

While searching, keep an eye out for the stone’s characteristic blue sheen – it’s a telltale sign you’ve struck lucky in this urban rockhounding hotspot.