重庆道源阁艺术品2019秋季拍卖精品藏品展示—陨石
【类别】杂项
【规格】重6850克

【简介】
陨石指坠落于地面的陨星残体,由铁、镍、硅酸盐等矿物质组成,亦称陨星石。也指含石质较多或全部为石质的陨星。在含碳量高的陨石中还发现了大量的氨、核酸、脂肪酸、色素和11种氨基酸等有机物,因此,人们认为地球生命的起源与陨石有相当大的关系。陨石表面都布有大小不一、深浅不等的凹坑,即熔蚀坑。不少陨石还具有浅而长条形气印,可能是低熔点矿物脱落留下的。陨石在经过大气层时,极高的温度导致陨石表面熔融,产生了一层微米至毫米级别玻璃质层,这就是熔壳。当陨石在地表存在较长时间后,其熔壳易被风化而消失掉。陨石因为含铁镍比重较大,铁陨石比重可达8,石陨石也因常含20铁镍,比一般岩石比重也大些。但是,存在极少量的石质陨石(如碳质球粒陨石等)因不含或金属含量极低,其密度与一般地球岩石相似。各种陨石因含有铁而具强度不等的磁性。陨石在无釉瓷板上摩擦一般没有条痕或仅有浅灰色条痕,而铁矿石的条痕则是黑色或棕红色,以此加以区别。
[Introduction]
Meteorite refers to the comet residue falling on the ground, composed of iron, nickel, silicate and other minerals, also known as meteorite. Also refers to comets containing more or all of the stone. A large amount of organic matter such as ammonia, nucleic acid, fatty acid, pigment, and 11 kinds of amino acids has been found in vermiculite with high carbon content. Therefore, it is believed that the origin of life on earth has a considerable relationship with meteorites. The surface of the meteorite is covered with pits of different sizes and shades, ie, etch pits. Many meteorites also have shallow and long strips of air, which may be caused by the loss of low-melting minerals. When the meteorite passes through the atmosphere, the extremely high temperature causes the surface of the vermiculite to melt, producing a layer of micron to millimeter-grade vitreous, which is the shell. When the meteorite exists on the surface for a long time, its melting shell is easily weathered and disappears. Due to the large proportion of iron and nickel, the proportion of iron meteorite can reach 8, and the meteorite also contains 20 iron and nickel, which is larger than the general rock. However, there are very few stone vermiculite (such as carbonaceous chondrites) that are not contained or have very low metal content, and their density is similar to that of ordinary earth rocks. Various meteorites have magnetic properties of varying strength due to the presence of iron. The meteorites are generally rubbed on the unglazed porcelain plates without streaks or only light gray streaks, while the streaks of iron ore are black or brownish red to distinguish them.
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