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Distribution and Varieties

Agates are very common, and they have been found on every continent, including Antarctica. In addition to names used to describe their structure, numerous geological, local, and trade names are applied to agates from different localities.^[1]

Africa

Blue lace agate is a pale blue and white lace agate found primarily in Namibia. These agates formed in dolomite associated with igneous rock.
Botswana agates are found in basaltic rocks of the Permian age in the South African country of Botswana. They feature contrasting bands of purple, pink, black, grey, and white. Like Lake Superior agates, they are typically small, averaging 2.5-5 cm (1-2 in) in diameter.
Malawi agates are typically bright red or orange with contrasting white bands.

South America

Brazilian agate is found as sizable geodes of layered nodules. These occur in brownish tones inter-layered with white and gray. It is often dyed in various colors for ornamental purposes.

North America

Coldwater agates, such as the Lake Michigan cloud agate, did not form under volcanic processes, but instead formed within the limestone and dolomite strata of marine origin. Like volcanic-origin agates, Coldwater agates formed from silica gels that lined pockets and seams within the bedrock. These agates are typically less colorful, with banded lines of grey and white chalcedony.^[2]
Crazy lace agate, typically found in Mexico, is often brightly colored with a complex pattern, demonstrating randomized distribution of contour lines and circular droplets, scattered throughout the rock. The stone is typically coloured red and white but is also seen to exhibit yellow and grey combinations as well.^[3]
Dugway geodes
Holley blue agate (also spelled "Holly blue agate") is a rare dark blue ribbon agate found only near Holley, Oregon.
Laguna agate
Lake Superior agates are found in the midwestern United States and
Lysite agate (WY)
Nebraska blue agate
Patuxent River stone is a red and yellow form of agate only found in Maryland.
Sweetwater agates (WY)
Thunder eggs (OR)
Turritella agate (Elimia tenera) is formed from the shells of fossilized freshwater Turritella gastropods with elongated spiral shells.

Europe

Greek agate is a name given to pale white to tan colored agate found in the former Greek colony of Sicily as early as 400 BCE. The Greeks used it for making jewelry and beads. (add from book: Sicily)
Germany
Czech Republic
Poland
France
Scotland
Pot stones or potato stones (England)
Wales

Agatized coral
"Turritella agate" (Elimia tenera)
Crazy lace agate
Botzwana agate

^ Cite error: The named reference :1 was invoked but never defined (see the help page).
^ Garvin, Paul (2010-09-13). Iowa's Minerals: Their Occurrence, Origins, Industries, and Lore. University of Iowa Press. ISBN 978-1-60938-014-4. Archived from the original on 2023-08-26. Retrieved 2020-10-29.
^ Atkinson, Bill; Ackerman, Diane (2004). Within the Stone: Photography. BrownTrout Publishers. ISBN 978-0-7631-8189-5. Archived from the original on 2023-08-26. Retrieved 2020-10-29.

[:1-1] Cite error: The named reference :1 was invoked but never defined (see the help page).

[2] Garvin, Paul (2010-09-13). Iowa's Minerals: Their Occurrence, Origins, Industries, and Lore. University of Iowa Press. ISBN 978-1-60938-014-4. Archived from the original on 2023-08-26. Retrieved 2020-10-29.

[3] Atkinson, Bill; Ackerman, Diane (2004). Within the Stone: Photography. BrownTrout Publishers. ISBN 978-0-7631-8189-5. Archived from the original on 2023-08-26. Retrieved 2020-10-29.

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