The black jute in the algae fossils of black jute is a paleontological fossil. Because the stone is covered with dense spiral particles of different sizes, the locals call it black jute. According to the expert's appraisal, the stone "belongs to bright crystalline calcareous limestone, which is a round or oval granular creature in the rock and a low-grade algae produced under the condition of turbulent seawater." Generally distributed on the edge of the platform, it can form a narrow strip with a width of 0- 10 km, tens of kilometers or even thousands of kilometers, belonging to Triassic algae fossils. "As a fossil, its scientific research value is self-evident. As far as its ornamental value is concerned, black hemp stone is basically the same as red plum stone, and its types are painting screen, landscape, pictographic and abstract. Half of them are granular, and the cows are cut into red stones; There are also white particles, but they are rare; Of course, if the particles are both obvious and hollow, it is even rarer. Among the strange stone species in central Guizhou, kenaf, black hemp and white hemp are called "three hemp" in central Guizhou. Black hemp stone can also be used as raw materials for craft stone carving, and its carving themes are usually toads, cheetahs, birds, snakes and so on. As a tourist product, it is very popular with tourists. Because of this, black jute has been mined on a large scale in recent years. The stone market is getting less and less, and the price is rising year by year. In addition to some fine products hidden by the local Youshi in the early years, it has become a commodity that "money is hard to buy".

The surrounding rock hardness of black hemp is about 5.5 degrees Mohs hardness, which belongs to calcareous rock. It is a typical "congenital water rush formation, no roots buried in the afterlife." In the cleaning process, you can use a little diluted dilute acid to brush. Avoid soaking in concentrated acid to avoid damaging particles. It has been suggested that hydrochloric acid and boiling water can be used for polishing, which is really a way to quench thirst by drinking poison. I beg to differ, but I still insist on long-term cultivation of professional petroleum ointment after cleaning.

Black hemp stone is produced in Shishan, Anshun City, central Guizhou Province. This stone belongs to algae fossils, and it is covered with dense spiral particles of different sizes. It is called black pockmarked stone locally, and its ornamental value is basically the same as that of red plum stone.

The surrounding rock of black hemp stone is mostly grayish white with a hardness of about 5.5 Mohs. Some are granular, some are red stones, and the particles on the stones are mostly black and occasionally white. It is better to have holes in the stone body with obvious particles, but it is rare.

Black jute is a calcareous limestone with bright crystal nucleus. It is a round or oval granular creature in rocks. It is a lower algae in seawater, which is generally distributed on the edge of the platform and belongs to Triassic algae fossils. The original stone was first washed with water and then buried in the ground with soil. Cleaning can be done with clear water or slightly diluted dilute acid. It is forbidden to soak in concentrated acid to avoid damaging particles. Black jute has different shapes, such as mountains and rivers, pictographs, etc., and can be used as raw materials for landscape stones and carving crafts.