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Agates, Amygdaloidal Type
   The amygdaloidal agates were formed by filling in the gas cavities within the dark colored basalt and andesite lava rocks. Since the basalt rocks tend to be good source of impurities acting like coloring agents, the agates are well known for their great variety of colors and shapes that cannot be rivaled by any other minerals as demonstrated by the fact that they had been widely used in many lapidary arts for thousands of years.

Updated
July 2019

What is "Amygdaloidal" and how did they form?.

 Agates of United States and Canada:
-- Lake Superior Agates Updated July 2019

-- Alaska:  Carnelian Agates from Nowitna River Updated April 2013
-- Arizona: July 4th Agates from Arizona Updated April 2013
-- Arizona: Mulligan Peak Agates from Clifton, Arizona Updated July 2019
-- Arizona: Antique Pink Agates, Round Muntain area Updated April 2013
--------------- Round Mtn. Plume Agates Updated April 2013
-- Arizona: Sheep Bridge Sagenite Agates (Purple Sagenite Agates) Updated April 2013
-- Arizona: Temporal Glutch Agates from Patagonia, Arizona Updated July 2013
-- Arizona: Santa Maria River  Updated April 2013
-- Arizona: Other Agates including "Silica Gem" from Arizona  Updated July 2012
-- California: Acton Agates  Updated July 2018
-- California: Nipomi Agates  Updated May 2016
-- California: Searles Lake Agates  Updated November 2015
 -- Idaho: Road Creek Agates from Challis, Idaho. Updated April 2013
-- Michigan: Agates of Copper Mines, Updated January 2017
-- Michigan: Brockway Mtns Agates, Updated July 2019
-- New Mexico: Cook's Peak Agates between Deming & Hatch 
-- New Mexico: Fort Cummings Agates, Updated November 2015
-- New Mexico: Lordsburg Plume Agates from Lordsburg(?) Updated July 2013
-- New Mexico: Purple "Bean" Agates of Hermanas   Updated November 2015
-- Montana: Yellowstone River Agates (Montana Agate), Updated July 2018
-- Montana: Missouri River Agates near Helena, Updated November 2015
-- Nevada: Agates from Nevada  Updated December 2012
-- Oregon: Amygdaloidal Agates of Oregon, Updated December 2017
-- Oregon: Domingo Pass Agates, Updated January 2015f
-- Oregon: Holly Blue Agates from Sweet Home Updated November 2012
-- Texas: Banded Marfa Agates from Marfa,Texas  Updated July 2013
-- Texas: Marfa Bouquet Plume Agates from Marfa,Texas Updated November 2015
-- Texas: Balmorhea Agates  Updated July 2012
-- Texas: Bishop Ranch Black Plume Agates, Updated July 2013
-- Texas: Fort Stockton Agate Updated December 2012
-- Texas: Larramore Ranch Updated July 2016
-- Texas: Needle Peak Moss Agates including Pom Pom Agates Updated July 2013
-- Texas: Pruett Agates, Updated December 2017
-- Texas: Rio Grande River Agates Updated July 2013
-- Texas: Stillwater Agates From Texas Updated July 2013
-- Texas: Toyah Agates, Updated July 2013
-- Texas: Van horn Agates Updated July 2013
-- Texas: Woodward & Walker Ranches Updated November 2015
-- Washington: Agates of Washington, Updated November 2015

-- Canada, Nova Scotia, Agates Updated July 2019
-- Canada, British Columbia,  Queen Charlotte Lake Beach Agate, Updated April 2015

 Agates of Mexico:
-- Apache Agates Updated April 2015
-- Aperajos Agates Updated January 2013
-- Agua Nueva Agates Updated May 2016
-- Black Royal Agates Updated November 2015
-- Calandria Agates Updated July 2012
-- Casas Grandes Agates Updated January 2015
-- Chinawa Agates, Updated November 2015
-- Coyomito Agates,  Updated July 2018
----- Old Coyomito Agates (from 1960-70s diggings) Updated January 2013
-- El Blanco Agates Updated November 2015
 -- El Sueco Agates Updated July 2018
-- "Fuego Nueva" Agates Updated November 2015
-- Gallego Agates, Updated November 2015
-- Gregoria Agates, Updated November 2015
-- Gregorian Vein Agates Updated January 2013
-- Hijo Del Sol Agates  Updated December 2017
-- Laguna Agates (All Claims): Updated November 2015
-- Limo Ato Agates,  Updated July 2019
-- Moctezuma Agates   Updated May 2016
-- Parcelas Agates Updated November 2015
-- San Martin Agates   Updated May 2016
-- Tomache Agates, Updated July 2012
-- Lake of Fire/Blue Aqua Nueva Agates, Updated December 2012
-- Purple Passion/ Seirra Madre/ Del Rey Agates , Updated May 2016
-- Red Lightning Agates & Amethyst Geodes, Updated December 2012

 Agates of Africa:
-- Algeria: Agates from Sahara Desert of Algeria Updated April 2013
-- Botswana: Botswana Agates ,  Updated May 2016
-- Madagascar: Carnelian Agates from Ambondromamy Updated January 2013
-- Madagascar: Dentritic Agate Updated January 2013
-- Malawi:  Classic Malawi Agates  Updated July 2019
-- Malawi:  Gambiri Agates  Updated July 2019
-- Morocco: Aouli Agates Updated July 2016
-- Morocco: Bou Hamza Agates Updated July 2016
-- Morocco: Bou Lili Agates Updated July 2016
-- Morocco: Kerrouche Agates Updated July 2016
-- Morocco: Sidi Rahai (GreenSkins, Ansi, Beber) Updated April 2013
-- Morocco: Toubkal Agates Updated July 2019
-- Morocco: Zaer Zaiane Agates Updated April 2013
-- Mozambique:  "Swasi/Swazi"  ("Rose") Agates Updated December 2017
-- Namibia: Agates from Namibia Updated July 2019
-- Zimbabwe: Zimbabwe Agates,  Updated May 2016
-- "Island" Island Agates, Updated December 2017

  Agates of Asia (including Russia):
-- Armenia: Armenian Agates  Updated July 2012
-- China: Fighting Blood Agates  Updated July 2019
-- China: Rain Flower Agates Updated December 2017
-- China:"ChopSticks" Agates from Gobi Desert of Northern China
-- East Timor: East Timor Agates Updated December 2012
-- Indonesia:  West Java Purple Agate Updated April 2013
-- Indonesia: Sumatra Agates Updated December 2012
-- India: BlackSkins & YellowSkins Agates  Updated July 2013
-- Japan: Japanese Agates  Updated November 2012
-- Mongolia: Gobi Desert Agates from Mongolia  Updated April 2013
-- Russia: Tyman River Agates from Russia Updated April 2013

 Agates of Australia & New Zealand:
-- Agate Creek Agates, Updated July 2017 (on last page)
-- New Zealand Agates Updated November 2012
-- Pilbara Agates Updated July 2012
-- Tasminia Agates, Updated November 2012
-- Tyalgum Agates, Updated December 2012
-- WaveHill Agates Updated December 2012

 Agates of Europe:
-- Bulgaria: Agates of Bulgaria   Updated July 2018
-- Czech Republic: Agates of Doubravice-Kye Updated February 2014
-- Czech Republic: Agates of Horni Halce(or Medenec) Updated February 2014
-- Czech Republic: Agates of Morcinov Updated February 2014
-- Hungary: Agates of Hungary Updated February 2014
-- Germany: Agates of Jurhem Quarry, Idar-Oberstein Updated February 2014
-- Germany: Other Agates of Germany (many locations) Updated November 2015
-- Netherlands: Agates of Netherlands (Rhine River) Updated February 2014
-- Poland: Ploczki Agates from Poland (not updated yet)
-- Scotland(UK): Scottish Agates Updated February 2014

 Agates of Latin & South Americas:
-- Argentina: Berwyn Agates  Updated November 2015
-- Argentina: Condor Agates (various claims) Updated November 2015
-- Argentina: El Entrie River (also "Black River" Agates) Updated February 2014
-- Argentina: La Manea Agates from Argentina  Updated February 2014
-- Argentina: El Sombrero Agates  Updated February 2014
-- Argentina: Other Agates of Patagonia   Updated February 2014
-- Brazil:  Bahoi/Bahia Agates  Updated July 2018
-- Brazil:  River Agates from Jequitinhohn River, Updated November 2015
-- Columbia: Agates of Columbia, Updated December 2017
-- Costa Rica: Agates of Costa Rica, Updated January 2015
-- Peru: Inca Agates,  Updated May 2016
-- Peru: Inca Vein Agates,   Updated July 2018

-- Brazilian Agates (not updated)
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