昌化雞血石，又名鳳血石，產於浙江省杭州臨安市昌化鎮西北面的玉岩山。該石是含辰砂礦物的緻密塊狀葉蠟石，具有鮮活艷麗如同雞血的色彩和亮麗剔透似美玉般的光澤，因其石色彩艷紅如雞血而得名。可用於製作印章、雕刻工藝品和原石欣賞。亦是我國最著名的四大系印章石之一。
關於昌化雞血石的形成有許多傳說，多與鳳凰有關。相傳，古代有一種鳥，叫「鳥獅」，生性好鬥。一天，覓食飛過玉岩山，見一凰正在孵蛋，頓生惡念，向其發起攻擊。毫無準備的凰被咬斷了腿。鳳聞訊趕到，同仇敵愾，戰勝了「鳥獅」。鳳凰雖然勝利了，但凰鮮血直流，染紅了整個玉岩山，遂成了光澤瑩透如美玉的雞血石。
中國人對於雞血石的認識始於明代初年，據史書記載，最早發現昌化雞血石的是上溪鄉玉山村一位農民，他在村莊對面康山嶺西側砍樵小憩時，見腳下露出地表的岩石晶瑩如玉，紅似雞血，艷麗非凡。出於好奇，他用鐵杵鑿下一塊帶回家中，村民們爭相觀賞，愛不釋手。由於昌化石軟硬適中，適宜鐫刻，特別是鮮紅的「血色」，不僅艷麗，而且象徵著吉祥，因此迅速傳揚開來，得到宮廷和工藝美術界的喜愛，迅速被列為中國圖章石之珍貴品種。相傳在一段時間內，獻玉石者可得官，稱之「玉石官」。
民間傳說，收藏雞血石會帶來好運，百姓藏之，可興家辟邪；帝王藏之，可鎮國安邦。清代官吏帽飾中，以花翎紅頂代表最高官位品級。雞血石紅曾代替珊瑚紅、瑪瑙紅為最高頂花品飾，可見雞血石當時身價之高。數百年來，昌化雞血石石一直受到文人雅士、商賈富豪、達官貴人，甚至帝王將相珍愛與收藏。
清代歷代皇帝與后妃多選昌化雞血石作為玉璽。乾隆49年，乾隆帝南巡到天目時，禪源寺主持獻給一方雞血石，乾隆帶去京刻了「乾隆之寶」玉璽一方。如今這方玉璽仍藏在故宮博物館的珍寶館「列代帝王印章六十八顆」之中，並註明有「用昌化雞血石雕刻」字樣。
昌化石石質相對多砂，一般都較壽山石和青田石稍堅，且硬度變化較大。質地也不如二者細膩。但也有質地細嫩者及各種顏色凍石。昌化石的顏色有白、黑、紅、黃、灰等各種顏色，品種也細分成很多種，多以顏色劃分。如白色者稱「白昌化」，黑色或灰色雜黑色者稱「黑昌化」，多色相間者則稱「花昌化」。而昌化石中，自古至今，自國內海外，最負盛名的便是「印石三寶」之一的「昌化雞血石」了。
Chicken blood stone produced in Lin'an City, Zhejiang Province Changhua Town, Inner Mongolia Chifeng City Bahrain Youqi, Shaanxi Xunyang County, as one of China's four major national stone, and Shoushan stone, Qingtian stone, Balin stone par. The Changhua chicken blood stone and Bahrain chicken bloodstone is the most famous.
Changhua chicken blood stone, also known as Fung blood stone, produced in Lin'an City, Zhejiang Province, Changhua Town, northwest of the jade rock. The stone is a dense block containing pyrophyllite mineral pyrophyllite, with fresh bright as chicken blood color and brightly carved like jade-like luster, because of its stone color red as chicken blood named. Can be used to make seals, carving crafts and enjoy the original stone. Is also one of the most famous four seal stone.
Changhua chicken blood on the formation of many legends, and more about the Phoenix. According to legend, there is a bird in ancient times, called "bird lion", nature of aggressive. One day, foraging fly over Yuyan Hill, see a phoenix is hatching eggs, Dayton evil thoughts, to attack. Unprepared Phoenix was bitten off the leg. Feng heard the news arrived, a common enemy, defeated the "bird lion." Although the victory of the Phoenix, but the Phoenix blood DC, the red jade mountain, then became shiny Yingying, such as jade jade bloodstone.
Chinese people for the understanding of bloodstone began in the early Ming Dynasty, according to historical records, the earliest discovery of Changhua Chicken Bloodstone is a farmer in the village of Yushan Village, Kang mountain opposite his village in the west side of woodcutting rest, see the foot of the rock exposed Crystal jade, red like chicken blood, gorgeous extraordinary. Out of curiosity, he chiseled down with a Tiechu home, the villagers competing to watch, put it down. As the Chang fossil soft and hard moderate, suitable for engraving, especially the bright red "blood", not only beautiful, but also a symbol of good fortune, so quickly spread to get the court and the arts and crafts industry favorite, quickly classified as China Stones precious Variety. According to legend, in a period of time, offer jade who can get official, called "jade official".
Folklore, the collection of bloodstone will bring good luck, the people of possession, can Xingjia evil spirits; possession of the emperor, the country can peace. Qing Dynasty official hat decorated to the top of the highest grade of flowers Ling red top grade. Bloodstone red instead of coral, agate red for the highest top flower ornaments, visible chicken bloodstone was worth high. For centuries, Changhua chicken blood stone has been literati, merchants Regal, dignitaries, and even the emperor will cherish and collectors.
Qing dynasty emperors and emperors choose Changhua chicken bloodstone as jade seal. Qianlong 49 years, the Qianlong Emperor Tour to the head of the South, the Chanyuan Temple presided over a party dedicated to bloodstone, Qianlong brought to Beijing carved "Qianlong treasure" jade seal party. Today, the party is still hidden in the Palace Museum of the Treasure Museum, "Lie on behalf of the emperor 's seal of 68", and marked with "Changhua chicken blood carving" message.
Changhua stone relatively more sand, generally more than Shoushan stone and Qingtian stone a little firm, and the hardness changes. Texture is not as delicate as the two. But there are also fine texture and a variety of colors frozen stone. Chang fossil colors are white, black, red, yellow, gray and other colors, the variety is also broken down into many species, mostly color division. Such as white, said "white Changhua", black or gray miscellaneous black called "black Changhua", multi-color and white, said "Hua Changhua." Changhua Stone, since ancient times, since the domestic and overseas, the most prestigious is the "Indian Stone Sambo" one of the "Changhua Chicken Bloodstone."
