Earth Sciences 1089F/G Lecture Notes - Lecture 7: Weathering, Hydrothermal Vent, Gibbsite
7 Oct 2016
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Document Summary
Metals used by humans were in pure elemental or native form. The value of minerals in ancient times reflected the rarity of native metal deposits. Increasing the usage of metals necessitated the development of smelting methods to separate metals from impure forms. Many metals mined today are derived from metal-bearing mineral compounds: ex: galena, magnetite. Metals are united by having high electrical conductivity, luster, malleability & the ability of their atoms to lose electrons to form positive ions. Metal refers to fusible metals metals with relative hardness that can be fused with other metals to for alloys (metal mixtures) We classify these fusible metals into two categories: precious metals. Metals of high economic value (used to make coins or jewelry) Many of these are desirable for the manufacture of electrical components due to their resistance to corrosion & oxidation: base metals. Most widely used are iron, lead, copper, zinc *& tin.
