Ziyang natural blue blackboard stone is produced in Ziyang County, Ankang City, Shaanxi Province. Ziyang County is China's largest natural blue blackboard stone deposit. The specific topography features form a natural blue blackboard with good quality. It is an environmentally safe building decoration stone. The color of Ziyang Blue Blackstone is blue-black, the color is soft and even, the light absorption is good, there is no single reflection, the lithology is dense and uniform, the texture is extremely developed, and the tap is steel. Ziyang Natural Blue Blackstone is a world-class high-quality acid-resistant slate.

Ziyang Blue Blackstone, produced in the administrative areas of 8 townships such as Chengguan Town, Hongqi Town, Xiangyang Town, Huangu Town, Haoping Town, Dongmu Township, Qiyuan Township and Miahe Township, Ziyang County, Ankang City, Shaanxi Province. Jurisdictional jurisdiction. Ziyang Blue Blackstone is highly competitive in the world, both in terms of quality and output. Many world-famous buildings such as the German Parliament Building and the British Museum are built with Ziyang Blue Blackstone. Stone characteristics Ziyang slate stone is hard, natural color, pressure-resistant, wear-resistant, corrosion-resistant, and non-radiative. It is a fine building and decorative material. The construction of villas with Ziyang slate has become the pursuit and symbol of many rich people in Europe and America. The structure of the slate is in the form of flakes or blocks. The particles are fine. The particle size is between 0.9 and 0.001 mm. It is usually a cryptocrystalline structure. It is dense and mostly oriented. The rock cleavage is very uniform in thickness and moderate in hardness. The water absorption rate is small. Its life expectancy is generally around 100 years. According to the historical records that can be verified, in the Ziyang County of Shaanxi, the hometown of the slate in China, since the pre-Qin period, the people used slate to cover the roof. Slate: A metamorphic rock formed of clay rock, sedimentary shale (sometimes made of quartz), finely divided, thin and brittle, usually black, gray or green. Slate refers to the commercial name of a rock that can be peeled off into a plate shape, commonly known as slate, slate, and bluestone. In petrology, it belongs to sedimentary metamorphic rocks. Slate is formed by the shallow metamorphism of clay rock, siltstone or medium-acid tuff. The slate is available in various colors, such as light blue, black, light green, pink, brown, light gray, and yellow. Slate has a special plate-like structure - slab. Not only is it easy to open along the slab, but the surface is very flat after being opened. The slate is not only rich in plate, but also has a hard texture, quaint color, low water absorption, no radiation pollution, and has the characteristics of matt, non-slip, acid and alkali resistance, fire resistance, cold resistance, weather resistance and good workability. Production history Ziyang people have used slate to create life for thousands of years. According to research, as early as the pre-Qin period, Ziyang people used tree column beams, used stone plates to block the wind, and used stones to make tables, chairs, stools and other household items. In the 21st century, there are many well-preserved ancient stone houses in Ziyang Folk Customs. The Shaanxi Artists Association has identified this as a sketching base. Nearly 1,000 painting and photography enthusiasts come here to create and visit.

Ziyang blue blackboard stone quality technical requirements (a) mining and processing. The thickness of the ore body is not less than 10m, the thickness of the stone is not more than 0.5m, the thickness ratio of ore stone is not less than 4:1, the stripping ratio is not more than 1:1, the open pit is less than 5m, and the ore body is located. Above the local minimum erosion datum; the length of the mound is not less than 0.25m, the rate of the pier is not less than 30%, and the rate of forming the plate is not less than 8%. It is forbidden to use destructive mining methods such as blasting to rationally utilize and protect resources. (2) Quality characteristics. 1. Appearance: It is blue-black, uniform in color, no one-way reflection, uniform in lithology, extremely developed in cleavage, and tapped in steel. 2. Physical and chemical indicators: project index water absorption rate (%) ≤0.40 bulk density (g/cm3) ≥2.60 bending strength (Mpa) ≥40 weathering softening depth (mm) ≤0.012 (0.30) dry and wet stability (including oxidizable The pyrite crystals are not allowed to be injected: the softening depth index is 0.012 before pickling and 0.30 is after pickling.

Apply to：
Producers within the scope of protection of Ziyang Blue Blackstone Geographical Indication Products may apply to the Ziyang County Quality and Technical Supervision Bureau of Shaanxi Province for the use of the “Special Mark for Geographical Indication Products”, which shall be approved by the General Administration of Quality Supervision, Inspection and Quarantine.