Fairburn Agate is a highly prized fortification agate famous for its intricate, multi-colored geometric banding patterns. It is typically found in the weathered gravels and sedimentary formations of western South Dakota and Nebraska, often requiring extensive searching in the field to locate. It is considered one of the finest examples of fortification banding in the world, making it a staple for serious lapidary artists and mineral collectors.
Is this fairburn agate?
5-step field checkRun through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.
- 1Test the hardnessTry to scratch fairburn agate with a known reference. Fairburn Agate sits at Mohs 6.5-7 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Fairburn Agate leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Fairburn Agate typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: red, yellow, brown, white, orange, pink.
- 5Look at form & habitCrystal system: trigonal. Typical habit: botryoidal.
Often confused with
Fairburn Agate vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside fairburn agate
Minerals reported to co-occur with fairburn 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
- 2.6-2.65 g/cm³
- Streak
- White
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Trigonal
- Crystal habit
- Botryoidal
- Cleavage
- None
- Rarity
- Rare
- Uses
- Lapidary, Collector, Decorative
- Host rock
- Sedimentary Gravel Deposits
- Typical price
- $20-500 depending on banding quality and size
Where rockhounds find fairburn agate
10 mapped spotsClassic worldwide localities
- Fairburn, South Dakota USA
- Custer County, South Dakota USA
- Fall River County, South Dakota USA
- Nebraska USA
Field-hunting tip
Look in sedimentary gravel deposits country — that is the host setting where fairburn agate typically forms. If you start seeing quartz, calcite, hematite in float, you are in the right ground. Field specimens usually show a botryoidal habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in Nebraska, South Dakota — start trip planning there.
Common questions
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Find fairburn agate on the map
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