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Stone ball

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Title: Stone ball  
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Subject: Rock art, Stone spheres of Costa Rica, Petrology
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Stone ball

A stone ball, or "stone sphere", is a spherical stone object that may be of either natural or artificial origin. Different types of stone balls include:

Natural

Artificial

External links


Stone round shot (cannonballs)
  • Ruffell, W.L., 1996, The Gun - Smoothbore Era 1550-1860: Projectiles Royal New Zealand Artillery Old Comrades' Association, New Zealand.
Stone balls (spheres) of Costa Rica
  • Hoopes, J.W., 2005, The Stone Balls of Costa Rica University of Kansas, Lawrence, Kansas.
Carved stone balls of Scotland
  • Hunterian Museum and Art Gallery, nd, Carved Stone Balls A gallery of carved stone ball photographs & information
  • Marischal Virtual Museum, nd, ball, carved stone Aberdeen Museum's virtual gallery of their Carved Stone balls
Megaspherulites
  • Baird, Bill, 1990, Stone Spheres, The Edinburgh Geologist, no 24 (Spring)
  • Heinrich, P.V., 2007, PDF version, 1.4 MBMegaspherulites. BackBender's Gazette. vol. 38, no. 7, pp. 8-12.
  • Rodríguez, E.A., 2002, The fantastic balls in el Cerro Piedras Bola (Jalisco), México desconocido # 305, July 2002. Last visited February 11, 2008.
  • Smith, R.K., R.L. Tremallo, and G.E. Lofgren, 2000, Megaspherulite Growth: Far From Equilibrium Crystallization, GeoCanada 2000 - The Millennium Geoscience Summit, Canadian Society of Exploration Geophysicists Annual Meeting.
  • Smith, R.K., R.L. Tremallo, and G.E. Lofgren, 2001, Growth of megaspherulites in a rhyolitic vitrophyre, American Mineralogist. vol. 86, pp. 589–600.
Cannonball concretions
  • Hanson, W.D., and J.M. Howard, 2005, PDF version, 2.8 MBSpherical Boulders in North-Central Arkansas Arkansas Geological Commission Miscellaneous Publication n. 22, pp. 1-23.
  • Heinrich, P.V., 2007, PDF version, 836 KBThe Giant Concretions of Rock City Kansas BackBender's Gazette. vol. 38, no. 8, pp. 6-12.
  • Irna, 2006, All that nature can never do, part IV : stone spheres
  • Irna, 2007a, Stone balls : in France too!
  • Irna, 2007b, Stone balls in Slovakia, Czech Republic and Poland
  • Leo Gav, 2007, Underwater stone balls
  • Hokianga Tourism Association, nd, Koutu boulders Really nice pictures of cannonball concretions.
  • United States Geological Survey, nd, cannonball concretion
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