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Las Choyas, Mun. de Ahumada, Chihuahua, Mexico

Diggings in a 2 square mile tuffaceous ash flow that produce the "Mexican Coconut" geodes

Ref:
Cross, B. & Culp Zeitner J. (2006): Geodes Natures Treasures, P.11-41

Finkelman, R.B., H.T. Evans, and J.J. Matzko, (1974): Manganese minerals in geodes from Chihuahua, Mexico. Mineralogical Magazine, MARCH 1974, VOL. 39, PP. 549-58.

Hoffmann-Rothe, R. (2006): "Coconuts": Die Knack-Geoden von Las Choyas, Mexiko. LAPIS 31 (11), 47-50

Robert B. Finkelman, John J. Matzko, Ching Chang Woo, John Sampson White & Walter R. Brown (1972): A Scanning Electron Microscopy Study of Minerals in Geodes from Chihuahua, Mexico. Mineralogical Record 3:205-212.





Mineral List:
  • Apatite-(CaOH)
    var: Carbonate-rich Apatite-(CaOH)
  • Beidellite
  • Birnessite
  • Calcite
  • 'Chalcedony'
  • Cryptomelane
  • Goethite
  • Gypsum
  • Hematite
  • Hollandite
  • Kaolinite
  • Mordenite
  • Opal
  • Pyrolusite
  • Quartz
  • Ramsdellite
  • RanciĆ©ite
  • Siderite
  • Todorokite


    19 entries listed. 17 valid minerals.

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