陨铁，铁陨石iron meteorite，主要成分为铁、镍的陨石。主要由铁纹石和镍纹石两种矿物组成，其次含有少量的石墨、陨磷铁镍矿、陨硫铬矿、陨碳铁、铬铁矿和陨硫铁等。在化学成分上除Ni和Fe外，还含有Co、S、P、Cu、Cr、Ga、Ge和Ir等元素。有少数铁陨石还含有硅酸盐包体。铁陨石的分类主要根据Ni、Ga、Ge和Ir的含量及其构造特征，分为13个群。铁陨石按照根据其内部的铁镍金属含量高低通常分为两大类：铁陨石、石铁陨石。石铁陨石：石铁陨石由铁、镍和硅、酸、盐矿物组成，铁镍金属含量30至65，这类陨石约占陨石总量的1.2，故商业价值。
石铁陨石根据起内部的主要成分和构造特点分为：橄榄石石铁陨石)、中铁陨石)、古铜辉石-鳞石英石铁陨石。铁陨石：铁陨石中含有百分90的铁，百分8的镍。它的外表裹着一层黑色或褐色的1毫米厚的氧化层，叫熔壳。铁陨石的切面与纯铁一样，很亮。金属 Fe-Ni 主要以三种铁-镍合金的形式出现；立方体心铁称为铁纹石、立方面心铁称为镍纹石、它们的细粒混合物称为合纹石。
铁纹石、镍纹石和合纹石中 Ni 的含量（分别为约 7% 、 11%-85% 、 11%-25% ）。三大类铁陨石的镍含量范围大致为：六面体铁陨石低于 6% ；八面体铁陨石为 6%-14% ；富镍角砾斑杂状铁陨石为 25%-65% 。 一外表特征：“铁陨石颜色多以棕色，灰色和黑色，外表有节状、重量比一般岩石要重很多、坚硬且不易碎裂的金属质地、磁性强、部分有气印； 二、结构特征 根据硝酸蚀刻抛光面，铁陨石具三种结构特征，即带有交错的条带结构，魏德曼花纹即维斯台登结构的八面体陨铁、有平行的诺伊曼线的六面体陨铁和没有清晰的条带的镍铁陨石。 三、成分特征 铁陨石都含有不同的铁纹石和镍纹石，此两类矿物由铁镍金属构成，且铁陨石主要成分为铁跟镍，含镍量均大于5%，有极少部分含镍量大于20%。”，有较高的研究价值。
Iron meteorite, a meteorite mainly composed of iron and nickel. It is mainly composed of two kinds of minerals, rhyolite and nicholite, followed by a small amount of graphite, meteorite ferro nickel ore, meteorite chromite, meteorite carbonite, Chromite and Troilite. In terms of chemical composition, in addition to Ni and Fe, it also contains elements such as Co, S, P, Cu, Cr, Ga, Ge, and Ir. A few Iron meteorite also contain silicate inclusions. The classification of Iron meteorite is mainly based on the contents of Ni, Ga, Ge and Ir and their structural characteristics, which can be divided into 13 groups. According to the content of iron and nickel in Iron meteorite, they are generally divided into two categories: Iron meteorite and Pallasite. Pallasite: Pallasite is composed of iron, nickel, silicon, acid and salt minerals. The content of iron and nickel is 30 to 65. This kind of meteorite accounts for about 1.2% of the total meteorite, so it is of commercial value. According to the main composition and structural characteristics of the interior, Pallasite can be divided into olivine Pallasite, mesosiderite), cupro pyroxene tridymite Pallasite. Iron meteorite: Iron meteorite contains 90% iron and 8% nickel. Its exterior is wrapped in a layer of black or brown 1 millimeter thick oxide layer, called a molten shell. The section of Iron meteorite is as bright as pure iron. The metal Fe Ni mainly appears in the form of three types of iron nickel alloys; The cubic core iron is called rhyolite, the cubic face core iron is called Taenite, and their fine mixture is called Plessite. The content of Ni in ankyrite, Taenite and Plessite is about 7%, 11% -85% and 11% -25% respectively. The nickel content of the three major types of Iron meteorite ranges roughly as follows: Hexahedron Iron meteorite are less than 6%; Octahedron Iron meteorite is 6% -14%; Nickel rich breccia mottled Iron meteorite is 25% -65%. 1. Appearance characteristics: "Iron meteorite are mostly brown, gray and black in color, with nodal appearance, much heavier than ordinary rocks, hard and hard metal texture, strong magnetism, and some air prints; II. Structural characteristics According to the nitric acid etching polishing surface, Iron meteorite have three structural characteristics, namely, with staggered stripe structure, Widmanstätten pattern is the Octahedrite of Westeden structure, Hexahedrite with parallel Neumann lines, and no Clear banded NiFe meteorite. 3、 Compositional characteristics Iron meteorite all contain different iron and nickel striates. These two types of minerals are composed of iron and nickel metals, and Iron meteorite are mainly composed of iron and nickel, with nickel content more than 5%, and a few of them contain more than 20% nickel. ", It has high research value.