Gravel suppliers use a conversion rate of 1.75 tonnes per cubic meter of loose filled 20 mm crush but depends on the type of rock and how dry it is. Dry gravel with little or no fines has a density of 1.5 tonnes per cubic meter. When the gravel is compacted it compress by about 20%.
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Gravel, sandstone, and conglomerate are all types of sedimentary rocks.
Depends what's in your gravel. In order of best to worst: Sandstone 1 Limestone Concrete Water Soil ref:http://en.wikipedia.org/wiki/List_of_thermal_conductivities
your eyesight
it is call lemstorne
u will need the density. density = mass / volume so mass = volume x density