1. If mixed into soil, white is perlite and brown is vermiculite. These two are expulsion; Of course, it may also be pumice, naturally formed.

2. If it is covered on the soil surface, it is ceramsite or pebbles that play a beautiful isolation role.

Extended data:

1, perlite: perlite is an acidic lava erupted by volcano, and it is glassy rock after rapid cooling, so it is named because of its pearl-like fracture structure. Perlite minerals include perlite, obsidian and turpentine. The difference between the three is that perlite has a circular crack formed by condensation, which is called perlite structure, and the water content is 2 ~ 6%; The turpentine rock has a unique turpentine luster, with a water content of 6 ~ 10%. Obsidian has glass luster and conchoidal fracture, and its water content is generally less than 2%.

2. Vermiculite is a natural, inorganic and nontoxic mineral, which will swell at high temperature. It is a rare mineral and belongs to silicate. Its crystal structure is monoclinic and looks like mica in appearance. Vermiculite is formed by hydration of some granites. It is usually produced simultaneously with asbestos. Because vermiculite has the ability of ion exchange, it plays a great role in soil nutrition. In 2000, the total output of vermiculite in the world exceeded 500,000 tons. The main producers are China, South Africa, Australia, Zimbabwe and the United States.

3, pumice refers to the roadway and mining face roof cracks, not yet out of the rock or ore body, but there is a risk of falling off the rock or ore block. Once pumice is found, it should be pried open manually to avoid damaging equipment and operators.

4. Ceramsite, as its name implies, is a kind of ceramic particles. The appearance characteristics of ceramsite are mostly round or oval spheres, but some broken-like ceramsite are irregular broken stones instead of round or oval spheres. The shape of ceramsite varies with different processes. Its surface is hard shell, ceramic or enamel, which has the function of isolating water and gas and giving ceramsite high strength.

5. Pebble: It is a by-product of mining yellow sand, so it is named because it looks like a goose egg. As a kind of pure natural stone, pebbles are taken from the gravel mountain produced by the uplift of the ancient river bed after the crustal movement thousands of years ago, and they are constantly squeezed and rubbed during the transportation of mountain torrents and running water. In the course of tens of thousands of years, pebbles have experienced the movement of waves and water, lost their irregular edges and corners by the collision and friction of gravel, and been buried underground with sediment for millions of years.

Source: Baidu Encyclopedia: perlite, Baidu Encyclopedia: vermiculite, Baidu Encyclopedia: pumice, Baidu Encyclopedia: ceramsite, Baidu Encyclopedia: cobblestone.