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   Orbicular Granite

   IMGP3583orb.jpg (99128 bytes)

 

This geologically interesting rock comes from near Mount Magnet in Western Australia. The orbicules occur in a granodiorite matrix.  They consist of andesine, plagioclase, hornblende & biotite arranged radially around a core of plagioclase &/or hornblende or less commonly mafic schist.

Here is a link to a site with detailed geological information on the formation of the orbicular granite.....http://www.nationalrockgarden.org.au/rock-collection-2/rock-listing/show/11

 orb-blocks-at-quarry.jpg (101702 bytes)     orbicular-quarry.jpg (146274 bytes)  3_ton_block.jpg (146142 bytes)

 

 

Orbicular Granite for sale..click here

 

 

  orbicular-tucson.jpg (159130 bytes) orb.jpg (155720 bytes) A large museum piece that I shipped to Tucson last year. A polished face on the front .The back retains the natural rough exterior.

orbicular-sphere.jpg (138253 bytes) An 18" sphere of orbicular granite.  

 

 

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Last modified: March 09, 2004