Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 1 What Is a Mineral? Chapter 5 Objectives Define mineral.

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Presentation transcript:

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 1 What Is a Mineral? Chapter 5 Objectives Define mineral. Compare the two main groups of minerals. Identify the six types of silicate crystalline structures. Describe three common nonsilicate crystalline structures.

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 1 What Is a Mineral? Chapter 5 Characteristics of Minerals mineral a natural, usually inorganic solid that has a characteristic chemical composition, an orderly internal structure, and a characteristic set of physical properties. To be a mineral, a substance must have four characteristics: it must be inorganic—it cannot be made of or by living things; it must occur naturally—it cannot be man-made; it must be a crystalline solid; it must have a consistent chemical composition.

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 1 What Is a Mineral? Chapter 5 Characteristics of Minerals, continued The diagram below shows the four characteristics of minerals.

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 1 What Is a Mineral? Chapter 5 Kinds of Minerals The 20 most common minerals are called rock-forming minerals because they form the rocks that make up Earth’s crust. Ten minerals are so common that they make up 90% of Earth’s crust. These minerals are quartz, orthoclase, plagioclase, muscovite, biotite, calcite, dolomite, halite, gypsum, and ferromagnesian minerals. All minerals can be classified into two main groups—silicate minerals and nonsilicate minerals—based on their chemical compositions.

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 1 What Is a Mineral? Chapter 5 Kinds of Minerals, continued Silicate Minerals silicate mineral a mineral that contains a combination of silicon and oxygen, and that may also contain one or more metals Common silicate minerals include quartz, feldspars, micas,and ferromagnesian minerals, such as amphiboles, pyroxenes, and olivines. Silicate minerals make up 96% of Earth’s crust. Quartz and feldspar alone make up more than 50% of the crust.

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 1 What Is a Mineral? Chapter 5 Kinds of Minerals, continued Nonsilicate Minerals nonsilicate mineral a mineral that does not contain compounds of silicon and oxygen Nonsilicate minerals comprise about 4% of Earth’s crust. Nonsilicate minerals are organized into six major groups based on their chemical compositions. The six major groups of nonsilicate minerals are carbonates, halides, native elements, oxides, sulfates, and sulfides.

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 1 What Is a Mineral? Chapter 5 Kinds of Minerals, continued Reading Check What compound of elements will you never find in a nonsilicate mineral?

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 1 What Is a Mineral? Chapter 5 Kinds of Minerals, continued Reading Check What compound of elements will you never find in a nonsilicate mineral? Nonsilicate minerals never contain compounds of silicon bonded to oxygen.