And as it cools, things start to crystallize and the heavy minerals would sink out and the light minerals would float.
当它冷却时，物体开始结晶，重的矿物质会下沉，轻的矿物质会漂浮。
英语百科
Heavy mineral
In geology, a heavy mineral is one with a density that is greater than 2.9 g/cm, most commonly referring to dense components of siliciclastic sediments. A heavy mineral suite is the relative percentages of heavy minerals in a stone. Heavy mineral suites are used to help determine the provenance and history of sedimentary rocks.