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A block of nearly pure quartz near the shore of Star Lake, Mt Madison NH.
Blocks like this (but mostly smaller) occur occassionally throughout the northern Presidential Range - you see them on the summit cone of Mt Washington in particular, where they're easily mistaken for snowfields. Breadloaf-sized quartz pieces are frequently used as the top stone in cairns for marking trails in the Presis.
I think I can see this block in satellite images.
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