There is no deterioration of siliceous rocks containing iron and other iron-containing rocks and poor iron quite unified international terminology. Therefore, in many countries, the same rock is used in different terms; conversely, the same term is used for various iron-bearing rocks. The terminology used in the Soviet Union is quite different from the terminology used in other countries.
In view of this, it is best to analyze common terms used in the study of the material composition and selectivity of ore in the Soviet Union and other countries.
The term "iron format-ion" has been used in the United States and Canada, Australia, and South America for the deposition of strip-like iron-bearing siliceous rocks. The term "jaspilite" was originally used to refer to the oxidized phase of the iron-bearing strata of Lake Superior, where the silica is jasper. In the Dictionary of the American Geological Society, the jasper iron rock is defined by the "rock composed mainly of the interaction layer of jasper and iron oxide".
The term "iron-containing stone" is different from the term "jasperite rock" and is used to mean a silicate-type iron-silica wide strip-like rock containing fine-grained quartz * horns. Experts in many countries believe that "iron-containing jasper" is synonymous with iron-bearing stones. Tieying—the unspoken language of Brazil, is widely used in South America, West Africa, and other places where the oxidized phase metamorphism of the iron-bearing strata reaches the extent that individual crystals in the rock can be distinguished by the naked eye.
Experts believe that the iron ore itself is a jasperite rock that has been metamorphosed by coarse-grained rocks.
Iron shale—a coarse-grained coarse rock (different from cassiterite) containing silicates and carbonates in addition to quartz and iron oxide, is synonymous with silicate-type iron-bearing quartzite ( According to the opinion of H.п. Shemienko). At the same time, according to the opinions of many American and Canadian geologists, iron shale and iron shale are synonymous terms.
"Belt-shaped hematite quartzite" - widely used in India, Australia and other countries to indicate the oxidation phase in the iron-bearing strata. Some of the material of the strip-shaped hematite quartzite has undergone tremendous metamorphism, equivalent to iron ore; the other part is equivalent to the jasperite rock in the Lake Superior.
"Quartzite iron" in the Soviet Union means having a strip-shaped structures, non-ferrous metal-depleted mass of quartz rock ore fraction thereof.
Ferruinus guartite is used in other countries to represent the genes of debris, although their chemical composition is the same as that of rocks containing iron.
The characteristics of major metal minerals, non-metallic minerals and associated minerals in iron ore are listed in Table 1. [next]
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For most metal minerals, lean iron ore can be divided into magnetite, hematite, siderite, hydrous oxide ore and silicate.
The primary minerals have undergone corresponding geological changes (deterioration, oxidation, etc.), resulting in the formation of secondary minerals in a continuous layer, such as magnetite-hematite, siderite-hydroxide, etc. . Dividing the ore into various types is stipulated by the standard, and only indicates that a certain mineral in this type of ore has an overwhelming advantage. More detailed classifications can be made based on the mineral composition of the ore, which can be divided into many major variants depending on the mineral composition of each type of ore (Table 2).
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The content of industrial iron minerals in ore can be used as a guideline for dividing ore into mineralogical variants. Among the industrial iron minerals are magnetite, hematite (false hematite) and siderite ( magnesium ). Siderite, magnesite), iron hydroxide and silicate iron minerals.
Under the above circumstances, various types of iron ore are referred to as industrial iron minerals, and the amount of iron combined with industrial iron minerals accounts for the majority of this type of ore. The content of other iron minerals in the iron ore species name should be considered to be added to the main name in the form of a prefix. The order of the prefixes used in geological mineralogy terms should reflect the increase in the content of these minerals in the ore. Obviously, in order to make the term simple, the content of various minerals constituting the variant name should be limited to a certain amount. According to the actual activity of the geological mineralogy, the quantity can be greater than 10% of the relative iron combined with the representative mineral according to the first approximation. For example, ore containing 30% magnetite (Mr), 15% hematite (Гт), 10% iron-containing silicate, and 2% siderite (Сп) should belong to the hematite-magnetite variety.
Depending on the similarity of the compounds, the mineral composition of the iron ore is a form of physical continuum or mechanical mixture in a specific proportion for certain types of ore and its variants. At this time, when the metal mineral, the non-metallic mineral, and the associated mineral are indicated by symbols, the contents of various minerals are represented by a numerical index. The symbols for the various minerals of iron ore are listed in Table 1.
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