Test 1: Take a small amount of Shilajit and press it in your front teeth. If there is any grit, it is not pure Shilajit
Test 2: Dissolve the Shilajit in water. If it is not fully dissolved, it is not pure Shilajit
Test 3: Burn the Shilajit. If it catches fire, it is not a pure Shilajit