Since ancient times, it is generally believed that wearing jade can ward off evil spirits. Although superstitious, there must be a reason.
The difference between jadeite and agate: green agate is not bright, the flashing blue color is relatively uniform, there is no silk green, little green, it is not as transparent as jadeite, but it is very bright, but it is transparent with rock sugar and similar substances (unclear in the body) and there are no bubbles. Green sparkles in the strong light, and the color is a bit.
Agate is a kind of jade. Jade is the general name of all jade and jade. China usually refers to nephrite, and the best nephrite producing area in the world is Hotan County, Xinjiang, China. Nephrite is mainly composed of actinolite-tremolite, which is fine in texture, moist to the touch, oily and shiny, felt-like in structure and easy to distinguish. Nephrite is evaluated by texture and color.
Agate belongs to low-grade jade raw materials. The aphanitic texture (that is, no crystal particles can be seen) has obvious band stripes and glass luster, which is easy to distinguish.
Pay attention to the difference between agate and chalcedony. Agate is aphanitic, with obvious banded texture and glassy luster, chalcedony is microcrystalline, without banded texture, glassy to oily luster.
Wearing jade often is good for your health, because jade contains many minerals that are good for your health and can be absorbed by your body when you wear it.
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Agate is the English name of agate and the Latin name of Rive Achates in Sicily. This is where Theophrastus first discovered agate in Italy (during the period of Dior Flatat). The word agate comes from Buddhist scriptures, and it is called "Asmagapo" in Sanskrit, which means "horse brain". The word agate was used earlier in China. Chalcedony is called chalcedony in English.
Agate and chalcedony are cryptocrystalline, and are collectively called chalcedony in mineralogy. Gemmologists call it an aphanitic block with banded structure. If the block has no banded structure, it is called agate and chalcedony. The chemical composition of agate is mainly silicon dioxide, which often contains trace elements such as iron, manganese and nickel. The crystal morphology is aphanitic, with granular and fibrous structure, and the aggregate is often stalactite, kidney-shaped, nodular and dense. Agate has annular stripes of various colors. Agate and chalcedony are pure white, and agate is very rich in color because it contains pigment ions and impurities, so there is a saying that there are thousands of agates and ten thousand kinds of jade. The colors are red, blue, green, yellow, brown, brown, purple, gray and black, as well as concentric, layered, corrugated and striped patterns. Grease luster to glass luster, transparent to translucent. The refractive index is 1.54- 1.55. Hardness 7, density 2.61-2.65g/cm3. No cleavage, conchoidal fracture and crack.
The difference between agate and chalcedony and similar jade. Agate and chalcedony can be distinguished according to different patterns such as colors and stripes. Chalcedony products are easily confused with Dongling stone, Miyu and Jasper, and can be distinguished according to the differences in color, texture and density. Chalcedony products have bright color, aphanitic texture and delicate texture. Quartzite such as Dongling Stone has coarse particles, fine structure and relatively rough texture. Jade similar to chrysotile includes emerald, turquoise and Tianhe stone. Green jadeite has variegated structure, and variegated or fibrous jadeite crystals can be seen. Turquoise has poor transparency, porcelain luster and low hardness of 5-6. Tianhe stone has obvious plaid stripes.
Evaluation and purchase of agate and chalcedony. Agate can be divided into the following varieties according to its morphological characteristics: onyx (including silk-wrapped agate and cut agate), red onyx, moss agate (also called dendritic agate), scenic agate (also called city agate), agate and water bile agate. Nanjing's famous "Rain Flower Stone" is an agate with concentric grain structure. The evaluation and purchase factors of agate are color, transparency and fragmentation. The technological requirements are bright and pure color and thick color layer; Smooth surface and high transparency; The pattern is even, clear and linear; Fine and tough texture; No cracks or few cracks; The block size is very large. Red and blue are the best. Varieties of chalcedony: chrysotile (also known as Australian jade, China is also known as Yingkashi), dense chrysotile, chrysotile, blood chalcedony (also known as bloodstone) and so on. Chalcedony is pure and beautiful in color, and the bigger the block, the better. The quality of chrysotile and chrysotile is the most precious. Chalcedony is mostly processed into rings, bracelets, necklaces and other jewelry.
Agate is a popular intermediate jade material since ancient times. There are countless famous agate jewelry in the world. Around 4000 BC, Egyptian Sameri people made an axe-like handicraft with agate, which is now in the new york History Museum. The largest water bile agate Art Grand View Garden in China, weighing 7350g, with a volume of 1 100 cubic centimeter and 850g of hidden water. The water sac is wrapped when agate is shaped, which is extremely precious and can be called a rare treasure. Many countries regard silk-wrapped agate and olivine as "birthstones in August". Westerners believe that wearing them symbolizes the harmony, love and happiness of husband and wife, and is known as the "stone of happiness".
Agate occurs in post-basic volcanic rocks, volcanic cracks and caves in hydrothermal deposits. Some people think that the cause of chrysotile asbestos is the result of hydrothermal process after volcanic period. There are many world-famous agate producing areas, such as red agate and big agate in Brazil and China, moss agate in India and the United States, and gray agate in Russia, Iceland, India, the United States and China. China is a big agate producer. World-class chrysotile asbestos is produced in Australia, Queensland, Sri Lanka, India and other countries.
(scientific name), also known as Jin Gangzuan, English Diamond, comes from the ancient Greek agonist, which means hard and inviolable substance. Diamond has a great hardness. The hardness here refers to Mohs hardness (non-impact resistance), and the hardness is 10. It is the hardest mineral known at present, and its absolute hardness is 1 0,000 times that of timely and10.50 times that of corundum. It is afraid of heavy blows, and the cleavage will break after heavy blows. Its density is 3.52g/cm3, and d = 3.2. Strong diamond luster. The refractive index is very high: 2.4 17, and the dispersion is moderate, being 0.044. An isotropic object. Melting point is higher than 3550℃, boiling point is 4827℃, and it is not conductive. The thermal conductivity is 0.35 calories/cm sec .. Tested by thermal conductivity meter, the response is the most sensitive. A set of cleavage is completed. Diamonds are luminous, and after being irradiated by sunlight, they can emit light blue phosphorescence at night. X-ray irradiation emits sky blue fluorescence. The chemical properties of diamond are very stable, and it is not easy to dissolve in acid and alkali at room temperature, and acid and alkali will not affect it.