Re: Re: Breccia photos from Tracy 6/4/2011
Lamprophyre is a good possibility if from a dike, but hard to tell on such a heavily weathered surface. Lighter colored crystals may be pyroxene or olivene. Probably not a kimberlite, as these are usually dark and very fine grain, weathering to grayish to yellowish clays (blue ground).
From MikeR - July 14, 2011 at 07:08:01