Lantian jade, commonly known as "Cai Yu", has a long history and enjoys a long reputation. As early as the Qin Dynasty, stone was mined here to make a jade seal, and the famous Heshibi was once produced here, which is known as one of the four famous jade in China. Hard texture, blue color, warm luster, delicate texture and multi-color jade. Its ore mainly consists of serpentine marble, tremolite, olivine, turquoise, diabase, brucite and other sedimentary rocks. Chemical components include silicon dioxide, aluminum oxide, magnesium oxide, sodium oxide, calcium oxide, copper oxide, iron oxide and so on. Mohs hardness is 2-6 degrees. It is a good raw material for jade carving and making handicrafts. Physical tests in lantian jade show that it contains many trace elements beneficial to human body, such as calcium, iron, potassium, sodium, manganese and copper. Has the functions of relaxing muscles and tendons, activating collaterals, promoting blood circulation and caring skin. Lantian jade is regarded as a kind of health jade. Wearing jade often can make the trace elements contained in jade inhale into human body through skin, thus balancing the imbalance between yin and yang and qi and blood, making people get rid of diseases, protect health and prolong life. Jade articles made in lantian jade are crystal clear and full of charm, and some are like pines and cypresses, flowing like clouds; Some are like a hundred fish play; Some are like blooming peonies, chrysanthemums and tall and straight bamboos; Some are like pandas eating bamboo and roaring in the valley; Danhe flies, and birds fly towards the phoenix; There is heavy splash of ink; Some are as white as fat; Some are green as jade; Some are as yellow as gold. These products, which combine reality with reality and have different expressions, add infinite interest to natural beauty and are favored by consumers at home and abroad. At present, the products are jade crafts, jade utensils, jade jewelry, jade plates, building decoration materials, jade health products, jade urns, ornamental jade and so on. , sold all over the country, and exported to Europe and America. Lantian jade and its handicrafts have become the pillar products of Shaanxi, enjoying high reputation at home and abroad.