pegmatite - please help to identify

[kamilp]

Hello,
I found location with interesting rocks, it should be pegmatite. Can you please help me to identify that rocks ? Is it pegmatite ? Also I do not know what causes that yellowish color of it. I noticed there large crystals of quartz. First two images are from pit and third is close outcrop.
Thanks

 

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[Eu_citzen]

A better close-up would be nice. But it does look like a quartz vein?