Metal minerals refer to minerals with gold properties, with metal or semi-metallic luster, with a variety of metal colors, such as lead gray, iron black, golden yellow, etc., opaque, non-conductive and good thermal conductivity.
Most of the compounds of heavy metal compounds are mainly sulfides and some oxides, a few of which are metallic elements, such as natural gold, and a small number of metal properties, such as sphalerite, cinnabar, cassiterite, etc., are also metal minerals. With the exception, graphite has metallic properties, but it does not belong to metal minerals.
Metal minerals include ferrous and non-ferrous metals. Among them, non-ferrous metals can be divided into five categories: non-ferrous heavy metals, non-ferrous light metals, rare metals, precious metals and semi-metals. Ferrous metals refer to iron and iron-based alloys, sometimes including manganese and chromium.
Non-ferrous metals are important basic materials, which are widely used in various fields of national economy and national security, which refer to all metals except iron and iron-based alloys (sometimes including chromium and manganese). Non-ferrous heavy metals refer to non-ferrous metals with a specific gravity of more than 4.5, such as copper, lead, mercury, etc.
While non-ferrous light metals refer to non-ferrous metals with a specific gravity of less than 4.5, such as aluminum, magnesium, sodium, calcium, etc. Rare metal refers to a small and dispersed non-ferrous metal in the earth's crust. Precious metals are non-ferrous metals with low content, high specific gravity (10.4-22.4), high melting point and high price, such as gold, silver and so on. Semi-metal refers to non-ferrous metals between metal and non-metal, such as silicon, selenium, tellurium, boron and so on.
1.Under room temperature, it is generally solid (mercury is liquid) and with metallic luster.
2.Most are silver-white (copper is purplish red, gold is yellow)
3.Good thermal conductivity, electrical conductivity and ductility.
Aluminum: the most abundant metal element in the earth's crust
Calcium: the most abundant metal element in the human body
Iron: the metal with the largest annual output in the world (iron > aluminum > copper)
Chromium: the metal with the highest hardness
Silver: the metal with the best conductivity and thermal conductivity (silver > copper > gold > aluminum)
Tungsten: the metal with the highest melting point
Mercury: the metal with the lowest melting point
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