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Posted in response to Georgia Rocks - Black Soil from Vicki on May 07, 2008 at 18:37:14:

Re: Georgia Rocks - Black Soil

Softer, igneous intrusive rocks such as Gabbro, often weather away on the surface, leaving a sandy regolith. Gabbros are mafic, meaning dark in color. Often they are a clue for prospectors, such as the dark, magnetite-bearing sands that indicated the underlying, platinum group elements-bearing prospect known as the Seagull Intrusion, owned by East-West Resources, in Ontario.

From Raymond Hietapakka - May 11, 2008 at 10:50:58
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Message Index Start New Topic Photo Gallery FAQ and Use Tips Bob's Rock Shop

Bob Keller