Both moisturedensity relationship and hydraulic conductivity tests were performed using packing materials consisting of bentonite clay and crushed basalt rock. moisturedensity relationship tests were performed on 2080, 2575, 5050, 7525, and 1000 wt. bentonitebasalt samples using Rock hardness property is common among the densest, fine-grained textured rocks, such as basalt. density the density of basalt is very high, the density of basalt can be seen through the combination of the porosity of the rock, i.e., 0.1 – 1, and its bulk density is 2.8 – 3 mg aka megagram per meter cube it is because about 50 percent of Not all crushed rock available on the oregon coast is basalt. some quarries produce a crushed rock from what is called the yamhill formation. this is a softer volcanic rock without the density or strength of basalt. river rock. river rocks on the oregon coast are Armour stones. basalt ag was originally founded to supply stone for coastal protection projects in the netherlands. rocks of various sizes and weights up to several tonnes are still supplied today for strengthening banks and dykes. hard rocks with particularly high density, strength and frost resistance are ideal for such purposes.