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geodes

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Journal Article

The genesis of agates and amethyst geodes

Ingrid N. Kigai
Published: 30 November 2019
The Canadian Mineralogist (2019) 57 (6): 867–883.
DOI: https://doi.org/10.3749/canmin.1900028
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The origin of large gypsum crystals in the Geode of Pulpí (Almería, Spain)

A. Canals, A.E.S. Van Driessche, F. Palero, J.M. García-Ruiz
Journal: Geology
Published: 15 October 2019
Geology (2019) 47 (12): 1161–1165.
DOI: https://doi.org/10.1130/G46734.1
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A new model of agate geode formation based on a combination of morphological features and silica sol–gel experiments

Charles Brian Howard, Avinoam Rabinovitch
Published: 01 January 2018
European Journal of Mineralogy (2018) 30 (1): 97–106.
DOI: https://doi.org/10.1127/ejm/2017/0029-2685
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U/Pb dating of geodic calcite: new insights on Western Europe major tectonic events and associated diagenetic fluids

Céline Pisapia, Pierre Deschamps, Anne Battani, Stéphane Buschaert, Abel Guihou, Bruno Hamelin, Jacques Brulhet
Published: 02 October 2017
Journal of the Geological Society (2018) 175 (1): 60–70.
DOI: https://doi.org/10.1144/jgs2017-067
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The origin of celestine–quartz–calcite geodes associated with a basaltic dyke, Makhtesh Ramon, Israel

MICHAEL ANENBURG, OR M. BIALIK, YEVGENY VAPNIK, HAZEL J. CHAPMAN, GILAD ANTLER, YARON KATZIR, MIKE J. BICKLE
Published: 29 October 2013
Geological Magazine (2014) 151 (5): 798–815.
DOI: https://doi.org/10.1017/S0016756813000800
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Geochemical and scintillometric characterization and correlation of amethyst geode-bearing Paraná lavas from the Quaraí and Los Catalanes districts, Brazil and Uruguay

LÉO A. HARTMANN, WILSON WILDNER, LAUREN C. DUARTE, SANDRO K. DUARTE, JULIANA PERTILLE, KARINE R. ARENA, LAURA C. MARTINS, NORBERTO LESSA DIAS
Published: 19 July 2010
Geological Magazine (2010) 147 (6): 954–970.
DOI: https://doi.org/10.1017/S0016756810000592
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Amethyst geodes in the basaltic flow from Triz quarry at Ametista do Sul (Rio Grande do Sul, Brazil): magmatic source of silica for the amethyst crystallizations

DOMINIQUE PROUST, CLAUDE FONTAINE
Published: 01 July 2007
Geological Magazine (2007) 144 (4): 731–739.
DOI: https://doi.org/10.1017/S0016756807003457
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Now you see it, now you don't

Ian Parsons
Journal: Elements
Published: 01 February 2007
Elements (2007) 3 (1): 3–4.
DOI: https://doi.org/10.2113/gselements.3.1.3
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Amethyst-bearing lava flows in the Paraná Basin (Rio Grande do Sul, Brazil): cooling, vesiculation and formation of the geodic cavities

DOMINIQUE PROUST, CLAUDE FONTAINE
Published: 01 January 2007
Geological Magazine (2007) 144 (1): 53–65.
DOI: https://doi.org/10.1017/S001675680600269X
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Formation of gigantic gypsum crystals

J. GARCIA-GUINEA, S. MORALES, A. DELGADO, C. RECIO, J.M. CALAFORRA
Published: 01 July 2002
Journal of the Geological Society (2002) 159 (4): 347–350.
DOI: https://doi.org/10.1144/0016-764902-001
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La mineralisation fluoree de type mississippi valley du Jebel Stah (Tunisie nord-orientale)

Fouad Souissi, Jean-Pol Fortune, Radhia Sassi
Published: 01 March 1998
Bulletin de la Société Géologique de France (1998) 169 (2): 163–175.
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Evaporites; in situ sulfur source for rhythmically banded ore in the Cadjebut mississippi valley-type Zn-Pb deposit, Western Australia

Linda A. Tompkins, Murray J. Rayner, David I. Groves, Michael T. Roche
Journal: Economic Geology
Published: 01 May 1994
Economic Geology (1994) 89 (3): 467–492.
DOI: https://doi.org/10.2113/gsecongeo.89.3.467
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Quartz geodes; early diagenetic silicified anhydrite nodules related to dolomitization

Robert G. Maliva
Published: 01 November 1987
Journal of Sedimentary Research (1987) 57 (6): 1054–1059.
DOI: https://doi.org/10.1306/212F8CE7-2B24-11D7-8648000102C1865D
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Late Cretaceous quartz geodes after anhydrite from Burgos, Spain

J. J. Elorza, J. Rodriguez-Lazaro
Published: 01 March 1984
Geological Magazine (1984) 121 (2): 107–113.
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Distribution of Mississippian geodes and geodal minerals in Kentucky

I. S. Fisher
Journal: Economic Geology
Published: 01 August 1977
Economic Geology (1977) 72 (5): 864–869.
DOI: https://doi.org/10.2113/gsecongeo.72.5.864
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Quartz replaced anhydrite nodules ('Bristol Diamonds') from the Triassic of the Bristol District

M. E. Tucker
Published: 01 November 1976
Geological Magazine (1976) 113 (6): 569–574.
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Feldspathic geodes near Black Mountain, western San Luis Obispo County, California

W. G. Ernst, C. A. Hall, Jr.
Published: 01 December 1975
American Mineralogist (1975) 60 (11-12): 1105–1112.
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The origin of quartz geodes and cauliflower cherts through the silicification of anhydrite nodules

T. M. Chowns, J. E. Elkins
Published: 01 September 1974
Journal of Sedimentary Research (1974) 44 (3): 885–903.
DOI: https://doi.org/10.1306/212F6BD1-2B24-11D7-8648000102C1865D
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D/H and 18 O/ 16 O Ratios in Waters Contained in Geodes from the Basaltic Province of Rio Grande do Sul, Brazil

EIICHI MATSUI, ENEAS SALATI, O. J. MARINI
Journal: GSA Bulletin
Published: 01 April 1974
GSA Bulletin (1974) 85 (4): 577–580.
DOI: https://doi.org/10.1130/0016-7606(1974)85<577:DAORIW>2.0.CO;2
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Geodes and concretions from the Mississippian Warsaw Formation, Keokuk region, Iowa, Illinois, Missouri

John B. Hayes
Published: 01 March 1964
Journal of Sedimentary Research (1964) 34 (1): 123–133.
DOI: https://doi.org/10.1306/74D70FE7-2B21-11D7-8648000102C1865D
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