May agate occurrence (Mayskoye agate occurrence), May, Pavlodar Region, Kazakhstani
| Regional Level Types | |
|---|---|
| May agate occurrence (Mayskoye agate occurrence) | Occurrence |
| May | District |
| Pavlodar Region | Region |
| Kazakhstan | Country |
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Latitude & Longitude (WGS84):
50° 30' 10'' North , 77° 49' 57'' East
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Other/historical names associated with this locality:
"Semipalatinsk" agate occurrence; "Semey" agate occurrence; "Maldyr"; "Kurchatov"
Other Languages:
Russian:
Майское проявление агатов ("Семипалатинское" проявление агатов; "Семейское" проявление агатов;"Малдыр"; "Курчатов"), Майский район, Павлодарская область, Казахстан
Important occurrence of agate, chalcedony and opal in Early and Late Permian volcanites located in the Maldyr tract, about 60 km southwest of the town of Kurchatov, on the territory of the Semipalatinsk Test Site in the area known as The Experimental Field [Опытное Поле], where more than 100 above-ground nuclear weapon tests were performed.
This occurrence is often indicated in mineral collections under the name of "Semipalatinsk" agate occurrence, "Semey" agate occurrence, "Maldyr", or "Kurchatov".
Early Permian acidic volcanic rocks are characterised by the presence of agates and vitrophyres. Agates appear in the form of spheroids and geodes in tuffs and ignimbrites, rhyolitic to rhyodacitic in composition, with lenticular vitrophyre bands. Spheroids are also observed in the superficial kaolin weathering crust. Spheroids are zoned. Their external "jacket" is made of a reddish-brown semivitreous lava, rhyolitic in composition, with rare scales of fresh biotite and feldspar phenocrysts. It is followed by a 1- to 2-cm-thick layer of brown, light grey, bluish, or bluish-gray chalcedony; opal may be locally present. The central part is frequently filled with semiteransparent drusy and comb quartz. Noble opal has been rarely observed in these spheroids. The size of spheroids and geodes usually varies from a few centimetres to 15-20 cm, but sometimes can attain 40-60 cm. Some geodes are hollow, others are filled with opal, often fluorescent for the presence of uranium salts.
Late Permian volcanics are represented by subalkali basalts, frequently amygdaloidal. Amygdales, varying in size from a few millimetres to 3-5 cm or more, are filled with light grey, cinder-grey, whitish, or bluish fine striped chalcedony. Sometimes, small crystals of hyaline or amethyst quartz are found in the geode centres.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
2 valid minerals.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ 'Biotite' Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 Reference: Bespaev, Kh.A., Uzhkenov, B.S., Aliaksarov, S.A., and Egembaev, K.M. [Беспаев, Х.А., Ужкенов, Б.С., Алиаскаров, С.А., и Егембаев, К.М.] (2001) Gemstones of Kazakhstan. Reference book. Volume II. Semi-precious and ornamental stones [Самоцветы Казахстана. Справочник. Том II. Ювелирно-поделочные и поделочные самоцветы]. Information-Analytical Center for Geology and Mineral Resources of the Republic of Kazakhstan [Информационно-аналитический центр геологии и минеральных ресурсов Республики Казахстан], Almaty, pages 106-107 (in Russian). |
| ⓘ 'Feldspar Group' Reference: Bespaev, Kh.A., Uzhkenov, B.S., Aliaksarov, S.A., and Egembaev, K.M. [Беспаев, Х.А., Ужкенов, Б.С., Алиаскаров, С.А., и Егембаев, К.М.] (2001) Gemstones of Kazakhstan. Reference book. Volume II. Semi-precious and ornamental stones [Самоцветы Казахстана. Справочник. Том II. Ювелирно-поделочные и поделочные самоцветы]. Information-Analytical Center for Geology and Mineral Resources of the Republic of Kazakhstan [Информационно-аналитический центр геологии и минеральных ресурсов Республики Казахстан], Almaty, pages 106-107 (in Russian). |
| ⓘ Opal Formula: SiO2 · nH2O Reference: Bespaev, Kh.A., Uzhkenov, B.S., Aliaksarov, S.A., and Egembaev, K.M. [Беспаев, Х.А., Ужкенов, Б.С., Алиаскаров, С.А., и Егембаев, К.М.] (2001) Gemstones of Kazakhstan. Reference book. Volume II. Semi-precious and ornamental stones [Самоцветы Казахстана. Справочник. Том II. Ювелирно-поделочные и поделочные самоцветы]. Information-Analytical Center for Geology and Mineral Resources of the Republic of Kazakhstan [Информационно-аналитический центр геологии и минеральных ресурсов Республики Казахстан], Almaty, pages 106-107 (in Russian). |
| ⓘ Quartz Formula: SiO2 Reference: Bespaev, Kh.A., Uzhkenov, B.S., Aliaksarov, S.A., and Egembaev, K.M. [Беспаев, Х.А., Ужкенов, Б.С., Алиаскаров, С.А., и Егембаев, К.М.] (2001) Gemstones of Kazakhstan. Reference book. Volume II. Semi-precious and ornamental stones [Самоцветы Казахстана. Справочник. Том II. Ювелирно-поделочные и поделочные самоцветы]. Information-Analytical Center for Geology and Mineral Resources of the Republic of Kazakhstan [Информационно-аналитический центр геологии и минеральных ресурсов Республики Казахстан], Almaty, pages 106-107 (in Russian). |
| ✪ Quartz var. Agate Reference: Bespaev, Kh.A., Uzhkenov, B.S., Aliaksarov, S.A., and Egembaev, K.M. [Беспаев, Х.А., Ужкенов, Б.С., Алиаскаров, С.А., и Егембаев, К.М.] (2001) Gemstones of Kazakhstan. Reference book. Volume II. Semi-precious and ornamental stones [Самоцветы Казахстана. Справочник. Том II. Ювелирно-поделочные и поделочные самоцветы]. Information-Analytical Center for Geology and Mineral Resources of the Republic of Kazakhstan [Информационно-аналитический центр геологии и минеральных ресурсов Республики Казахстан], Almaty, pages 106-107 (in Russian). |
| ⓘ Quartz var. Chalcedony Formula: SiO2 Reference: Bespaev, Kh.A., Uzhkenov, B.S., Aliaksarov, S.A., and Egembaev, K.M. [Беспаев, Х.А., Ужкенов, Б.С., Алиаскаров, С.А., и Егембаев, К.М.] (2001) Gemstones of Kazakhstan. Reference book. Volume II. Semi-precious and ornamental stones [Самоцветы Казахстана. Справочник. Том II. Ювелирно-поделочные и поделочные самоцветы]. Information-Analytical Center for Geology and Mineral Resources of the Republic of Kazakhstan [Информационно-аналитический центр геологии и минеральных ресурсов Республики Казахстан], Almaty, pages 106-107 (in Russian). |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Opal | 4.DA.10 | SiO2 · nH2O |
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| ⓘ | var. Agate | 4.DA.05 | SiO2 |
| ⓘ | var. Chalcedony | 4.DA.05 | SiO2 |
| Unclassified Minerals, Rocks, etc. | |||
| ⓘ | 'Biotite' | - | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| ⓘ | 'Feldspar Group' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Opal | SiO2 · nH2O |
| H | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| O | Oxygen | |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Quartz var. Chalcedony | SiO2 |
| O | ⓘ Opal | SiO2 · nH2O |
| O | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| F | Fluorine | |
| F | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| Mg | Magnesium | |
| Mg | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| Al | Aluminium | |
| Al | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Quartz var. Chalcedony | SiO2 |
| Si | ⓘ Opal | SiO2 · nH2O |
| Si | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| K | Potassium | |
| K | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| Ti | Titanium | |
| Ti | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| Fe | Iron | |
| Fe | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
References
Sort by
Year (asc) Year (desc) Author (A-Z) Author (Z-A)Bespaev, Kh.A., Uzhkenov, B.S., Aliaksarov, S.A., and Egembaev, K.M. [Беспаев, Х.А., Ужкенов, Б.С., Алиаскаров, С.А., и Егембаев, К.М.] (2001) Gemstones of Kazakhstan. Reference book. Volume II. Semi-precious and ornamental stones [Самоцветы Казахстана. Справочник. Том II. Ювелирно-поделочные и поделочные самоцветы]. Information-Analytical Center for Geology and Mineral Resources of the Republic of Kazakhstan [Информационно-аналитический центр геологии и минеральных ресурсов Республики Казахстан], Almaty, pages 106-107 (in Russian).
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May agate occurrence, May, Pavlodar Region, Kazakhstan