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Sand from White Sands Nat Mon in NM will be a tremendous improvement in isolation.

Of course its a national monument, so smuggling sand will have to be discrete, but I can get it for you if the price is right for the risk.

It isn't quartz, so the vibes won't make the stuff ring or cause any interfering piezoelectric effects.
Its gypsum; much finer grained than quartz sands. Smaller particles pack better; less open space, therefore provide much greater dampening effect. its from a desert, so drying won't be necessary.

For weighting applications, I prefer coastal tabular basalt from the Pacific Northwest instead of granites or diorites from interior regions. Much denser and heavier per given size, which is why the granitic continents float on it. I can also provide this for you at a price, but paying for the heavy airline bag isn't cheap.

Somebody made little neoprene rubber/plastic (Sorbothane, I think) rings to slide down around tubes to damp vibes. Better than chewing gum, but much more expensive.

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