The facts
What fairburn Agate actually is
Fairburn Agate is classified as chalcedony (agate), with the composition SiO₂. It crystallises in the cryptocrystalline trigonal system.
Colour comes from iron and manganese oxides give red, gold and grey in the distinctive tight fortification bands, which is also what a laboratory looks at when it is asked whether a colour is natural.
Refractive index 1.530–1.539. Specific gravity around 2.58–2.64. Cleavage: none. Those three numbers separate it from most of what imitates it.
Where fairburn Agate comes from
Fairburn Agate is produced at Fairburn, Custer County, South Dakota, USA and Nebraska badlands, USA.
The locality is part of the description, not a footnote — two stones of the same weight from two of these places are not the same stone.
How fairburn Agate is treated
Untreated and collected loose from the surface; almost the whole value is in the natural fortification pattern on a weathered nodule. Cut faces are generally worth less than an intact weathered stone.
Treatment changes value, sometimes by a multiple, so it belongs in the description before the price and not after the sale.
What fairburn Agate is confused with
In the trade fairburn Agate is most often mistaken for, or substituted by, Teepee Canyon agate, Lake Superior agate or Laguna agate.
The separation is rarely a matter of opinion: refractive index 1.530–1.539 and specific gravity 2.58–2.64 settle most of it in a minute, and magnification settles the rest.
What fairburn Agate is used for
Demand for fairburn Agate comes from mineral collecting and jewellery, which is why one price per carat never covers it.
We quote each application in the unit that trade actually buys in, by the specimen or by the carat.
Durability and care
Fairburn Agate is 6.5–7 on the Mohs scale, with none cleavage.
With no cleavage plane to worry about, the practical limit is abrasion rather than breakage, and it takes daily wear well.
Warm water, mild soap and a soft brush. Avoid ultrasonic cleaners on anything fracture-filled, stabilised, dyed or visibly included.
What fairburn Agate costs
As a guide, fairburn Agate trades around Small field-collected stones 30–300 USD; exhibition-quality pieces in the thousands.
That is a range, not a quote. Colour, size, clarity, cut and origin move the figure a long way inside it, and the only honest price is one given against a specific stone. Send us what you need and we will price it.
Questions
Is fairburn Agate treated, and how?
Untreated and collected loose from the surface; almost the whole value is in the natural fortification pattern on a weathered nodule. Cut faces are generally worth less than an intact weathered stone.
Where does fairburn Agate come from?
Fairburn, Custer County, South Dakota, USA and Nebraska badlands, USA. Origin affects price, so we name the locality rather than the country on every quote.
Is fairburn Agate hard enough to wear every day?
Yes. At 6.5–7 on the Mohs scale with no cleavage plane, it handles daily wear well. The practical limit is gradual abrasion rather than chipping.
How much does fairburn Agate cost?
Indicatively Small field-collected stones 30–300 USD; exhibition-quality pieces in the thousands. Colour, size, clarity and origin move the price a long way within that, so treat it as a range and ask for a quote against a specific stone.
What is fairburn Agate confused with?
Most often Teepee Canyon agate, Lake Superior agate and Laguna agate. A refractive index of 1.530–1.539 and a specific gravity near 2.58–2.64 separate it quickly.
Related stones
Looking for fairburn agate?
Tell us the size, the quality and what it is for. We source it, photograph it and quote it — with the locality named.
Ask about fairburn agate