The sandstone contains lesser amount of heavyminerals such as zircon, garnet, tourmaline, and staurolite.
砂岩中含少量的重矿物，如锆石、 石榴石、电气石、十字石等。
2
Above, remove the light minerals and the heavyminerals, rinse with alcohol after drying, weighing, place the sample in the bag. If you find it you call her at.
Most rainforest soils are thin and poor because they lack minerals and because the heat and heavy rainfall destroy most organic matter in the soils within four years of it reaching the forest floor.