Opaldigger
You are a goose
http://www.csgnetwork.com/specificgravmattable.html
It is a link to wet sand as bought from your garden shop.
This is sand and gravel compressed for 40M Years 200m below the surface. The gravel contains a large amount of hematite. Its specific gravity is 2.6
I do not know where you get your highly fanciful figures from.
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