Gemstone with concentric layers of cryptocrystalline chalcedony
Fairburn Agate
Fairburn Agate showing the fortification matrix
General
Category
Mineral
Formula (repeating unit)
SiO2 silicon dioxide
Identification
Color
brown, red, orange, blue, yellow, black, and white banded
Crystal habit
Cryptocrystalline silica
Mohs scale hardness
6.5–7
Luster
Waxy
The Fairburn Agate is a type of gemstone found in the agate beds of Southwestern South Dakota and Northwestern Nebraska. It is also the state gemstone of South Dakota.[1] Fairburns are characterized from other types of agate by their colors and the shape of the bands.[1][2]
^ abClark, Roger. (2009). South Dakota's State Gemstone : [autographed copy] ; Fairburn Agate. Clark, Mary, Jane. (1st ed.). Appleton, WI: Siverwind Agates. ISBN 9780966464023. OCLC 698895703.
^Clark, Roger (Roger W.) (1998). South Dakota's Fairburn agate (1st ed.). Appleton, WI: Silverwind Agates. ISBN 0966464001. OCLC 39727762.
The FairburnAgate is a type of gemstone found in the agate beds of Southwestern South Dakota and Northwestern Nebraska. It is also the state gemstone...
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Minnelusa Formation Stratigraphic range: Carboniferous FairburnAgate (ultimately derived from the Minnelusa Formation; South Dakota) Type Formation Location...
banded, dendritic, moss, iris and Fairburn style agate), and Shelby County (Lake Superior type agate and agatized corals and sponges). Limestone, common...
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