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[55fossil]

   Looks similar to material I have found in an area full of feldspar materials. To which there was also black tourmaline (schorl), quartz points and amazonite in the pink host material along with stuff like yours.
QUESTION;  What other materials were in the area where you found this rock? The host material will help define how the rock was formed and narrow down the possibilities of what it is. Was it near that mountain of white Quartz you are sitting on? The area you were hunting in would else help if it is not top secret.   
pretty stuff,  Neal

[kent]

Neal,

The most prevalent rocks are granite, typical of the Sierras south of Lake Tahoe. 

[55fossil]

Kent;  Found this neat post that may help.  http://nevada-outback-gems.com/Common_rocks/Pegmatite.htm   I have no idea where this information came from but it is fairly on with my thinking about pegmatite's.

Your picture with all the loose white rocks surrounded by what looks like granite boulders????  Makes me wonder if all those white pieces were eroded out of the host rock or deposited by a glacial event?????   

    The colors of your rock make me think of feldspar pegmatite's.  This is what makes rocks fun. You get a headache and run for some brews to think deeper.

[southerly]

looks like quartz to me, possibly on the the way to quartzite