Agate (English Wikipedia)

Theophrastus; Caley, Earle R.; Richards, John F.C (1956). Theophrastus. On Stones. Columbus, Ohio: The Ohio State University. p. 52. Retrieved 6 May 2026. The achates is also a beautiful stone; it comes from the river Achates in Sicily and is sold at a high price.

arkansas.gov (Global: low place; English: 6,640^th place)

geology.arkansas.gov

Guccione, M. J.; Prior, W. L.; Rutledge, E. M. (1986). "The Tertiary and Quaternary Geology of Crowley's Ridge: A Guidebook". Office of the State Geologist. Arkansas Geological Commission. Retrieved 17 February 2026.

books.google.com (Global: 3^rd place; English: 3^rd place)

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.

britannica.com (Global: 37^th place; English: 64^th place)

"treated gem". Encyclopedia Britannica. 6 November 2016. Retrieved 8 September 2025.

cambridge.org (Global: 209^th place; English: 151^st place)

Götze, Jens; Gaft, Michael; Möckel, Robert (August 2015). "Uranium and uranyl luminescence in agate/chalcedony". Mineralogical Magazine. 79 (4): 985–995. doi:10.1180/minmag.2015.079.4.08. Retrieved 4 May 2026.
Moxon, Terry (October 2017). "A re-examination of water in agate and its bearing on the agate genesis enigma". Mineralogical Magazine. 81 (5): 1223–1244. Bibcode:2017MinM...81.1223M. doi:10.1180/minmag.2017.081.002. Retrieved 16 October 2025.

doi.org (Global: 2^nd place; English: 2^nd place)

"Achate, N. (1), Etymology." Oxford English Dictionary. Oxford University Press. Retrieved 6 May 2026. doi:10.1093/OED/6418139009
Heaney, Peter J.; Post, Jeffrey E. (24 January 1992). "The Widespread Distribution of a Novel Silica Polymorph in Microcrystalline Quartz Varieties". Science. 255 (5043): 442. Bibcode:1992Sci...255..441H. doi:10.1126/science.255.5043.441. PMID 17842895. Retrieved 26 April 2026.
Götze, Möckel & Pan 2020, 4.1.1. Götze, Jens; Möckel, Robert; Pan, Yuanming (20 November 2020). "Mineralogy, Geochemistry and Genesis of Agate—A Review". Minerals. 10 (11): 1037. Bibcode:2020Mine...10.1037G. doi:10.3390/min10111037.
Moxon, Terry; Ríos, Susana (29 March 2004). "Moganite and water content as a function of age in agate: an XRD and thermogravimetric study". European Journal of Mineralogy. 16 (2): 269–278. Bibcode:2004EJMin..16..269M. doi:10.1127/0935-1221/2004/0016-0269. Retrieved 26 April 2026.
Götze, Möckel & Pan 2020, 4.2.3. Götze, Jens; Möckel, Robert; Pan, Yuanming (20 November 2020). "Mineralogy, Geochemistry and Genesis of Agate—A Review". Minerals. 10 (11): 1037. Bibcode:2020Mine...10.1037G. doi:10.3390/min10111037.
Götze, Möckel & Pan 2020, 4.2.1. Götze, Jens; Möckel, Robert; Pan, Yuanming (20 November 2020). "Mineralogy, Geochemistry and Genesis of Agate—A Review". Minerals. 10 (11): 1037. Bibcode:2020Mine...10.1037G. doi:10.3390/min10111037.
Götze, Jens; Gaft, Michael; Möckel, Robert (August 2015). "Uranium and uranyl luminescence in agate/chalcedony". Mineralogical Magazine. 79 (4): 985–995. doi:10.1180/minmag.2015.079.4.08. Retrieved 4 May 2026.
Welman-Purchase, Megan; Wicht, Joanna; Miller, Duncan; Roelofse, Frederick (April 2024). "Blue lace agate and chalcedony pseudomorphs from Ysterputs in southern Namibia". Journal of African Earth Sciences. 212 105211. Bibcode:2024JAfES.21205211W. doi:10.1016/j.jafrearsci.2024.105211.
Wang, Yifeng; Merino, Enrique (1990-06-01). "Self-organizational origin of agates: Banding, fiber twisting, composition, and dynamic crystallization model". Geochimica et Cosmochimica Acta. 54 (6): 1627–1638. Bibcode:1990GeCoA..54.1627W. doi:10.1016/0016-7037(90)90396-3. ISSN 0016-7037.
Moxon, Terry (October 2017). "A re-examination of water in agate and its bearing on the agate genesis enigma". Mineralogical Magazine. 81 (5): 1223–1244. Bibcode:2017MinM...81.1223M. doi:10.1180/minmag.2017.081.002. Retrieved 16 October 2025.
Moxon, T; Reed, S. J. B. (2006). "Agate and chalcedony from igneous and sedimentary hosts aged from 13 to 3480 Ma: a cathodoluminescence study". Mineralogical Magazine. 70 (5): 485–498. Bibcode:2006MinM...70..485M. doi:10.1180/0026461067050347. S2CID 54607138. Archived from the original on March 13, 2022. Retrieved October 1, 2006.
Götze, Möckel & Pan 2020, 3. Götze, Jens; Möckel, Robert; Pan, Yuanming (20 November 2020). "Mineralogy, Geochemistry and Genesis of Agate—A Review". Minerals. 10 (11): 1037. Bibcode:2020Mine...10.1037G. doi:10.3390/min10111037.
Götze, Möckel & Pan 2020, 5.1. Götze, Jens; Möckel, Robert; Pan, Yuanming (20 November 2020). "Mineralogy, Geochemistry and Genesis of Agate—A Review". Minerals. 10 (11): 1037. Bibcode:2020Mine...10.1037G. doi:10.3390/min10111037.
de Almeida Silva, Rodrigo; Petter, Carlos Otavio; Schneider, Ivo André H. (September 2007). "Avaliação da perda da coloração artificial de ágatas". Rem: Revista Escola de Minas. 60 (3): 477–482. doi:10.1590/S0370-44672007000300007. hdl:10183/10181.
Chaudhury, Nayanjeet; Phatak, Ajay; Paliwal, Rajiv (January 2012). "Co-morbidities among silicotics at Shakarpur: A follow up study". Lung India. 29 (1): 6–10. doi:10.4103/0970-2113.92348. PMC 3276038. PMID 22345906.
Jiang, CQ; Xiao, LW; Lam, TH; Xie, NW; Zhu, CQ (July 2001). "Accelerated silicosis in workers exposed to agate dust in Guangzhou, China". American Journal of Industrial Medicine. 40 (1): 87–91. doi:10.1002/ajim.1074. PMID 11439400.
Tiwari, RR; Narain, R; Sharma, YK; Kumar, S (September 2010). "Comparison of respiratory morbidity between present and ex-workers of quartz crushing units: Healthy workers' effect". Indian Journal of Occupational and Environmental Medicine. 14 (3): 87–90. doi:10.4103/0019-5278.75695. PMC 3062020. PMID 21461160.

farlang.com (Global: low place; English: low place)

"Background Article on Idar Oberstein". Archived from the original on 2008-12-23. Retrieved 2008-11-27.

gamineral.org (Global: low place; English: low place)

Bates, R. L.; Jackson, J. A. (1987). Glossary of Geological Terms (3rd ed.). Alexandria, Virginia: American Geological Institute. p. 788. Retrieved 9 March 2025.

gemdat.org (Global: low place; English: low place)

"Agate". gemdat.org. Retrieved 9 March 2025.

gemsociety.org (Global: low place; English: low place)

"Agate Value, Price, and Jewelry Information". gemsociety.org. International Gem Society. Retrieved 9 March 2025.

geocaching.com (Global: low place; English: low place)

Jedi Cacher. "GC32FBP Teepee Canyon Agate Beds (Earthcache) in South Dakota, United States created by Jedi Cacher".

geology.com (Global: 8,329^th place; English: low place)

King, Hobart M. "Turritella Agate". geology.com. Retrieved 16 February 2025.

geologyin.com (Global: low place; English: low place)

Team, Geology In. "Moss Agate: Formation, Occurrence, Uses". Geology In. Retrieved 2025-02-11.

geoscienceworld.org (Global: 2,947^th place; English: 2,107^th place)

pubs.geoscienceworld.org

Moxon, T; Reed, S. J. B. (2006). "Agate and chalcedony from igneous and sedimentary hosts aged from 13 to 3480 Ma: a cathodoluminescence study". Mineralogical Magazine. 70 (5): 485–498. Bibcode:2006MinM...70..485M. doi:10.1180/0026461067050347. S2CID 54607138. Archived from the original on March 13, 2022. Retrieved October 1, 2006.

hdl.handle.net (Global: 66^th place; English: 34^th place)

de Almeida Silva, Rodrigo; Petter, Carlos Otavio; Schneider, Ivo André H. (September 2007). "Avaliação da perda da coloração artificial de ágatas". Rem: Revista Escola de Minas. 60 (3): 477–482. doi:10.1590/S0370-44672007000300007. hdl:10183/10181.

kyrockclub.com (Global: low place; English: low place)

Haggard, Liam. "Kentucky Agate: Geology, Imperial Agate & Estill County".

merriam-webster.com (Global: 425^th place; English: 373^rd place)

"Agate". merriam-webster.com. Merriam-Webster. Retrieved 6 May 2026.

mindat.org (Global: 712^th place; English: 1,219^th place)

"Agate". mindat.org. Hudson Institute of Mineralogy. Retrieved 10 February 2025.
"Chalcedony". mindat.org. Hudson Institute of Mineralogy. Retrieved 18 September 2025.
"Mogánite". mindat.org. Hudson Institute of Mineralogy. Retrieved 26 April 2026.
"Fossil Agate". mindat.org. Hudson Institute of Mineralogy. Retrieved 9 March 2025.
"Petrified Wood". mindat.org. Hudson Institute of Mineralogy. Retrieved 9 March 2025.
"Agatized coral". mindat.org. Hudson Institute of Mineralogy. Retrieved 9 March 2025.
"Fortification Agate". mindat.org. Retrieved 15 May 2026.
"Brecciated agate". Mindat.org. Hudson Institute of Mineralogy. Retrieved February 11, 2025.
"Eye Agate". Mindat.org. Hudson Institute of Mineralogy. Retrieved February 11, 2025.
"Onyx". mindat.org. Hudson Institute of Mineralogy. Retrieved February 9, 2025.
"Sardonyx". mindat.org. Hudson Institute of Mineralogy. Retrieved February 10, 2025.
"Sagenite". mindat.org. Hudson Institute of Mineralogy. Retrieved 16 February 2025.
"Dendritic Agate". mindat.org. Hudson Institute of Mineralogy. Retrieved 15 May 2026.
"Moss Agate". mindat.org. Hudson Institute of Mineralogy. Retrieved 15 May 2026.
"Plume Agate". mindat.org. Hudson Institute of Mineralogy. Retrieved 15 May 2026.
"Enhydro Agate". mindat.org. Hudson Institute of Mineralogy. Retrieved 9 March 2025.
"Iris Agate". mindat.org. Hudson Institute of Mineralogy. Retrieved 15 May 2026.
"Collins Harbour, King George Island, South Shetland Islands, Antarctic Peninsula, Western Antarctica, Antarctica". mindat.org. Hudson Institute of Mineralogy. Retrieved 16 February 2025.
"Agate from Crowley's Ridge (Crowleys Ridge), Malden, Dunklin County, Missouri, USA". mindat.org. Hudson Institute of Mineralogy. Retrieved 17 February 2026.
"Fairburn Agate". mindat.org. Hudson Institute of Mineralogy. Retrieved 16 February 2025.
"Laguna Agate". www.mindat.org. Retrieved 2025-02-16.
"Lake Superior Agate". mindat.org. Hudson Institute of Mineralogy. Retrieved 16 February 2025.
Russell, Daniel (13 January 2008). "Historic Methods of Artificially Coloring Agates". mindat.org. Hudson Institute of Mineralogy. Retrieved 8 September 2025.

nih.gov (Global: 5^th place; English: 5^th place)

pubmed.ncbi.nlm.nih.gov

Heaney, Peter J.; Post, Jeffrey E. (24 January 1992). "The Widespread Distribution of a Novel Silica Polymorph in Microcrystalline Quartz Varieties". Science. 255 (5043): 442. Bibcode:1992Sci...255..441H. doi:10.1126/science.255.5043.441. PMID 17842895. Retrieved 26 April 2026.
Chaudhury, Nayanjeet; Phatak, Ajay; Paliwal, Rajiv (January 2012). "Co-morbidities among silicotics at Shakarpur: A follow up study". Lung India. 29 (1): 6–10. doi:10.4103/0970-2113.92348. PMC 3276038. PMID 22345906.
Jiang, CQ; Xiao, LW; Lam, TH; Xie, NW; Zhu, CQ (July 2001). "Accelerated silicosis in workers exposed to agate dust in Guangzhou, China". American Journal of Industrial Medicine. 40 (1): 87–91. doi:10.1002/ajim.1074. PMID 11439400.
Tiwari, RR; Narain, R; Sharma, YK; Kumar, S (September 2010). "Comparison of respiratory morbidity between present and ex-workers of quartz crushing units: Healthy workers' effect". Indian Journal of Occupational and Environmental Medicine. 14 (3): 87–90. doi:10.4103/0019-5278.75695. PMC 3062020. PMID 21461160.

ncbi.nlm.nih.gov

Chaudhury, Nayanjeet; Phatak, Ajay; Paliwal, Rajiv (January 2012). "Co-morbidities among silicotics at Shakarpur: A follow up study". Lung India. 29 (1): 6–10. doi:10.4103/0970-2113.92348. PMC 3276038. PMID 22345906.
Tiwari, RR; Narain, R; Sharma, YK; Kumar, S (September 2010). "Comparison of respiratory morbidity between present and ex-workers of quartz crushing units: Healthy workers' effect". Indian Journal of Occupational and Environmental Medicine. 14 (3): 87–90. doi:10.4103/0019-5278.75695. PMC 3062020. PMID 21461160.

oed.com (Global: 743^rd place; English: 419^th place)

"Achate, N. (1), Etymology." Oxford English Dictionary. Oxford University Press. Retrieved 6 May 2026. doi:10.1093/OED/6418139009

ou.edu (Global: 5,903^rd place; English: 3,538^th place)

ogs.ou.edu

Suneson, Neil H.; Lyon, William G.; Goza, David (July–August 2013). "Boley Agate — Chert Breccia Clasts In The Vamoosa Formation" (PDF). Shale Shaker. 64 (1): 22–37. Retrieved 27 July 2025.

psu.edu (Global: 299^th place; English: 159^th place)

Brown, Nancy Marie (31 August 2001). "How Do Agates Form?". psu.edu. The Pennsylvania State University. Retrieved 3 March 2025.

sailorenergy.net (Global: low place; English: low place)

"Crowley's Ridge Agates". Dwarves' Earth Treasures. Retrieved 17 February 2026.

schweizerbart.de (Global: 6,346^th place; English: 8,812^th place)

Moxon, Terry; Ríos, Susana (29 March 2004). "Moganite and water content as a function of age in agate: an XRD and thermogravimetric study". European Journal of Mineralogy. 16 (2): 269–278. Bibcode:2004EJMin..16..269M. doi:10.1127/0935-1221/2004/0016-0269. Retrieved 26 April 2026.

scielo.br (Global: 1,374^th place; English: 3,149^th place)

de Almeida Silva, Rodrigo; Petter, Carlos Otavio; Schneider, Ivo André H. (September 2007). "Avaliação da perda da coloração artificial de ágatas". Rem: Revista Escola de Minas. 60 (3): 477–482. doi:10.1590/S0370-44672007000300007. hdl:10183/10181.

science.org (Global: 1,007^th place; English: 665^th place)

Heaney, Peter J.; Post, Jeffrey E. (24 January 1992). "The Widespread Distribution of a Novel Silica Polymorph in Microcrystalline Quartz Varieties". Science. 255 (5043): 442. Bibcode:1992Sci...255..441H. doi:10.1126/science.255.5043.441. PMID 17842895. Retrieved 26 April 2026.

semanticscholar.org (Global: 15^th place; English: 8^th place)

api.semanticscholar.org

Moxon, T; Reed, S. J. B. (2006). "Agate and chalcedony from igneous and sedimentary hosts aged from 13 to 3480 Ma: a cathodoluminescence study". Mineralogical Magazine. 70 (5): 485–498. Bibcode:2006MinM...70..485M. doi:10.1180/0026461067050347. S2CID 54607138. Archived from the original on March 13, 2022. Retrieved October 1, 2006.

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"Masterpiece of Greek Art Found in the Griffin Warrior Tomb". Smithsonian. Smithsonian Institution. 7 November 2017.

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South Dakota Rockhound (10/19/2026). "Teepee Canyon - South Dakota Rockhound". {{cite web}}: Check date values in: |date= (help)

theagateworks.com (Global: low place; English: low place)

The Agate Works (10/19/2026). "The Agate Works". {{cite web}}: Check date values in: |date= (help)

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C. Michael Hogan. 2007. Knossos fieldnotes, Modern Antiquarian Archived 2018-07-11 at the Wayback Machine

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perseus.tufts.edu

Pliny the Elder; Bostock, John; Riley, H. T. "Book 37, Chapter 54". Naturalis historia. Perseus Digital Library. Retrieved 6 May 2026. Achates was a stone formerly in high esteem, but now held in none. It was first found in Sicily, near a river of that name; but has since been discovered in numerous other localities.

uky.edu (Global: 3,287^th place; English: 1,839^th place)

"Kentucky Official State Mineral is Agate".

web.archive.org (Global: 1^st place; English: 1^st place)

Moxon, T; Reed, S. J. B. (2006). "Agate and chalcedony from igneous and sedimentary hosts aged from 13 to 3480 Ma: a cathodoluminescence study". Mineralogical Magazine. 70 (5): 485–498. Bibcode:2006MinM...70..485M. doi:10.1180/0026461067050347. S2CID 54607138. Archived from the original on March 13, 2022. Retrieved October 1, 2006.
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.
C. Michael Hogan. 2007. Knossos fieldnotes, Modern Antiquarian Archived 2018-07-11 at the Wayback Machine
"Background Article on Idar Oberstein". Archived from the original on 2008-12-23. Retrieved 2008-11-27.

worldcat.org (Global: 4^th place; English: 4^th place)

search.worldcat.org

Wang, Yifeng; Merino, Enrique (1990-06-01). "Self-organizational origin of agates: Banding, fiber twisting, composition, and dynamic crystallization model". Geochimica et Cosmochimica Acta. 54 (6): 1627–1638. Bibcode:1990GeCoA..54.1627W. doi:10.1016/0016-7037(90)90396-3. ISSN 0016-7037.

Agate (English Wikipedia)

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