This silvery liquid metal is very dense, yet has a high surface tension that causes is to form tiny little perfect spheres in the pores of the rocks it is found in. When frozen, mercury forms crystals in the rhombohedral system at low pressure, and in the tetragonal system at high pressure. Color is bright silvery metalic. Luster is metallic.
Transparency is opaque.
Crystal System does not apply Crystal Habits spherical droplets, or pools of mercury liquid. Associated Minerals are cinnabar , calomel , and other secondary mercury minerals. It also expans at a constant rate with a rise in temperature.