Prairie Agate is a variety of chalcedony typically found as nodules in the Great Plains region of the United States. It is prized by lapidary artists for its warm, earthy tones and unique banding patterns, which often resemble desert landscapes or complex swirling fortifications.

Hardness

6.5-7

Mohs

Luster

Waxy

Streak

White

Transparency

Translucent

mineralcommonQuartz family

Prairie Agate

Hardness: 6.5-7
Luster: Waxy
Streak: White
Transparency: Translucent

Is this prairie agate?

5-step field check

Run through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.

1
Test the hardness
Try to scratch prairie agate with a known reference. Prairie Agate sits at Mohs 6.5-7 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Prairie Agate leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Prairie Agate typically shows a waxy luster.
4
Match the color range
Compare against the expected color range: yellow, brown, orange, cream, white.
5
Look at form & habit
Crystal system: trigonal. Typical habit: nodular.

Often confused with

Prairie Agate vs. its common look-alikes — and how to tell them apart in the field.

How to tell apart: Luster reads waxy on Prairie Agate and vitreous on Opalite.

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Often found alongside prairie agate

Minerals reported to co-occur with prairie agate. Spotting these in float or country rock is a strong cue you are in the right ground.

All properties

Chemical formula: SiO₂
Mohs hardness: 6.5-7
Density: 2.6-2.7 g/cm³
Colors: Yellow Brown Orange Cream White
Streak: White
Luster: Waxy
Transparency: Translucent
Crystal system: Trigonal
Crystal habit: Nodular
Cleavage: None
Rarity: Common
Uses: Lapidary, Collector, Decorative
Host rock: Sedimentary
Typical price: $5-50 for slabs and cabochons

Where rockhounds find prairie agate

Classic worldwide localities

Wyoming, USA
Nebraska, USA
South Dakota, USA

Field-hunting tip

Look in sedimentary country — that is the host setting where prairie agate typically forms. If you start seeing calcite, quartz, chalcedony in float, you are in the right ground. Field specimens usually show a nodular habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify prairie agate?+

Mohs hardness is 6.5-7. It typically shows a waxy luster. The streak is white. Common colors include yellow, brown, orange, cream.

Where is prairie agate found?+

Notable localities include Wyoming, USA; Nebraska, USA; South Dakota, USA.

How much is prairie agate worth?+

Typical asking prices fall in the range of $5-50 for slabs and cabochons. Quality, size, and provenance can move individual specimens well outside that range.

What rocks look like prairie agate?+

Prairie Agate is most often confused with Jasper, Flint Nodules, Opalite. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with prairie agate?+

Prairie Agate commonly co-occurs with Calcite, Quartz, Chalcedony. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does prairie agate form in?+

Prairie Agate typically forms in sedimentary. Working float back to the host body is the standard way to chase a fresh occurrence.

What is prairie agate used for?+

Prairie Agate is used in lapidary, collector, decorative.

Find prairie agate on the map

RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.