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EARTH MATERIALS. Chapter 26. MINERALS – 26.1 A. Common Elements 1. Elements in Earth’s Crust a. What are the elements found in the Earth’s Crust? Oxygen, Silicon, Aluminum, Iron, Calcium, Sodium, Potassium, and Magnesium.

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Earth materials


Chapter 26

  • MINERALS – 26.1

    A. Common Elements

    1. Elements in Earth’s Crust

    a. What are the elements found in the Earth’s Crust?

    Oxygen, Silicon, Aluminum, Iron, Calcium, Sodium, Potassium, and Magnesium.

b. What are the elements found in the Continental Crust?

Greater abundance of less dense elements such as, Silicon, Oxygen, Aluminum, and Potassium.

c. What are the elements found in the Oceanic Crust? More dense materials such as, Iron, and Magnesium.

  • What’s a mineral? Crust?

    1. Please Define Mineral:

    Naturally occurring, inorganic solid with

    a crystalline form.

  • Mineral Identification impurity

    1. Color can be the least reliable property for mineral identification. The same mineral can occur naturally in a variety of colors. For example, quartz can be colorless, purple, yellow, gray, or rose-colored.

  • Luster impurity

    a. Please Define Luster:

    Property of metals and alloys that describes having a shiny appearance.

  • Streak impurity

    a. Please Define Streak:

    Color of a mineral in its powdered form.

3. Streak chart impurity

  • Atomic arrangement impurity

    a. Please Define Atomic arrangement:

    The orderly arrangement of atoms in a mineral’s structure. This arrangement of atoms can reflect the way

    a mineral breaks, how hard it is, and what type of crystal shape it has.

  • Cleavage impurity

    a. Please Define Cleavage:

    Manner in which a mineral breaks along planes of weakness, creating sets of smooth parallel sides; determined by the arrangement of atoms in the mineral’s structure.

  • Fracture impurity

    a. Please Define Fracture:

    Manner in which a mineral without cleavage will break, producing uneven, irregular surfaces.

  • Hardness impurity

    a. Please Define Hardness:

    Measure of a mineral’s resistance to scratching, described by Mohs scale hardness.

  • Crystal shape impurity

    a. Please Define Crystal shape:

    Crystal shapes are used to determine the crystal system that a mineral belongs to.

  • Mineral Formation impurity

    1. Minerals from hot water

    a. How does this happen?

    As hot water solution cools, its particles slow down and dissolved materials are able to crystallize out of solution.

  • Minerals from evaporation impurity

    a. How does this happen?

    When water evaporates, dissolved mineral material can crystallize from a saturated solution.

  • Mineral Groups impurity

    1. Silicates

    a. Please Define Silicates:

    The basic building block for the silicate minerals is a simple silicate ion (SiO44-), composed of four oxygen atoms tightly bonded to a silicon atom. This forms a geometric structure called a tetrahedron.

  • Silicate structures impurity

    a. Minerals of the crust

    1.) What are some of the silicates from the Crust?

    a. Quartz, potassium Feldspar, from Continental Crust.

    b. Plagioclase feldspar from Oceanic Crust.

  • Nonsilicates impurity

    a. Please Define Nonsilicates:

    Minerals that do not contain silicon. Examples are; carbonates, halides, oxides, sulfides, sulfates, and native elements such as iron, copper, and sulfur.

  • Mineral Uses impurity

    1. What are some uses of Minerals?

    The mineral halite (NaCl) is used to flavor and preserve food. Gold and Silver is used for currency. Hematite or Iron Ore is used to make iron and steel. Quartz or SiO2 is used to make glass and calcite or cement.

  • IGNEOUS ROCKS – 26.2 impurity

    A. What’s a rock?

    1. Please Define Rock:

    Naturally formed mixture of minerals, rock fragments or volcanic glass, bound together, identified based on composition and texture.

  • Intrusive Igneous Rocks impurity

    1. Please Define Intrusive Igneous Rocks:

    Rock that formed from magma that solidified within Earth’s crust, also called Plutonic rock.

  • Magma composition impurity

    a. Bowen’s Reaction Series

    1.) What is Bowen’s Reaction Series?

    Simultaneous crystallization of silicate minerals with a decrease in temperature.

  • Three magma types impurity

    1.) What are the three Magma Types?

    (a) Mafic rocks- poor in silica and dense and comprise the

    Oceanic Crust.

    (b) Felsic rocks- rich in silica and have

    low densities that comprise the Continental Crust.

    (c) Intermediate Rocks- have both mafic and felsic.

  • Intrusive rock textures impurity

    a. What is Intrusive rock textures?

    Rocks that cooled slowly underground and have coarse-grained textures. Examples of such rocks are granite, diorite, and gabbro.

  • Extrusive Igneous Rocks impurity

    1. Please Define Extrusive Igneous Rocks:

    Rock that formed from lava or ash that solidified on Earth’s surface. Obsidian is an example of rock that

    cooled so quickly that almost no crystals are formed.

    Obsidian appears glassy.

  • Other textures impurity

    a. What are other Textures?

    Pumice and scoria are examples of extrusive igneous rocks that have vesicular texture. These rocks formed as trapped gases escape from a volcano during an eruption. Another type of texture, called porphyritic texture, results when minerals cool at different rates and create a rock with two different-size crystals.

Scoria- vesicular texture impurity

Granite- porphyritic texture

  • Common Igneous Rocks impurity

    1. Name three Common Intrusive Igneous Rocks:

    a. Granite

    b. Diorite

    c. Gabbro

  • Gases impurity

    a. What are some gases found in Magma?

    1.) Water vapor

    2.) Carbon dioxide

  • SEDIMENTARY ROCKS – 26.3 impurity

    A. Clasts

    1. Please Define Clasts:

    Small rock and mineral fragments that can become part of another rock.

  • Weathering impurity

    a. Please Define Weathering:

    Process that involves the physical of chemical breakdown of materials on Earth’s surface.

  • Compaction and cementation impurity

    a. Please Define Compaction:

    Process by which clasts stick together due to

    the weight of overlying material.

b. Please Define Cementation: impurity

Process of minerals precipitating out of solution into the spaces between clasts.

  • Detrital impurity Sedimentary Rocks

    1. Please Define Detrital:

    Sedimentary rocks that are made mostly of clasts. Geologists classify detrital sedimentary rocks based on clast size. In order of decreasing size, clasts are classified as gravel, sand, silt, and mud or clay.

  • Clast impurity size

    a. What can Clast size be used for?

    The size of a clast can be used to infer how the clast was transported. It takes more force to move large clasts than it takes to move small clasts.

  • Composition impurity

    a. What is Composition?

    Detrital sedimentary rock composition depends on the type of rock material that is weathered, transported, and deposited.

  • Classification impurity

    a. How are sedimentary Rocks Classified?

    Geologist classify detrital sedimentary rocks

    based on clast size.

C. Chemical Sedimentary Rocks impurity

1. How do Chemical Sedimentary Rocks form?

Chemical sedimentary rocks form from water that contains dissolved solids. Rock salt and gypsum are two examples of chemical sedimentary rocks.

  • Biochemical Sedimentary Rocks impurity

    1. What are Biochemical Sedimentary Rocks?

    If sedimentary rocks contain the remains of living organisms, they are biochemical sedimentary rocks. Limestone and coal are examples of Biochemical Sedimentary Rocks.

  • Coal impurity

    a. What is Coal?

    Coal is composed almost entirely of the carbon that remains after plant material is compressed underground.

  • Formation of coal impurity

    1.) Where does Coal Form?

    Coal usually develops from peat, a brown, lightweight deposit of moss and other plant matter.


    A. Metamorphic Rocks

    1. Please Define Metamorphic Rock:

    Igneous or sedimentary rocks that have been changed by any combination of heat, pressure, and chemical reactions.

  • Composition impurity

    a. Please Define Composition:

    The presence of water within rock enables chemical reactions to occur. Water can flow into cracks or pores in rock and cause atoms in minerals to rearrange and change composition.

  • Mineral composition impurity

    1.) Please Define Mineral composition:

    Clay minerals, mica, and amphiboles are examples of minerals that contain water in their crystal structures.

  • Textures impurity

    a. Please Define Texture:

    Textures describes the size, shape, and arrangement of the crystals or grains in a rock.

b. Please Define Foliated: impurity

Texture of some metamorphic rocks in which crystals are arranged in layers and bands as a result of high pressure conditions.

c. Foliated rocks impurity

1.) Name some Foliated Rocks:

(a.) Slate

(b.) Phyllite

(c.) Schist

(d.) Gneiss

  • Nonfoliated impurity rocks

    Definition: Nonfoliated metamorphic rocks tend to have random crystal orientation and are uniform in color.

    1.) Name some Nonfoliated rocks

    (a.) Quartzite came from quartz

    (b.) Marble came from limestone

  • Classification impurity

    a. How are Metamorphic rocks Classified?

    Metamorphic rocks can be classified based on texture and mineral composition.

  • The Rock Cycle impurity

    1. Please Define the Rock Cycle:

    The continual changing of rocks into different types through processes such as high temperature and pressure, weathering, erosion and sedimentation.

  • Conservation of matter impurity

    a. What is the Conservation of Matter as it applies to the Rock Cycle?

    Minerals in rocks are neither created nor destroyed but are changed over time by heat and pressure to another type of rock.

  • CHAPTER 26 REVIEW p. 840. impurity

    A. Check Concepts

    1. Please do Check Concepts 41-47, p. 840.

    B. Standardized Test Practice

    1. Please do Standardized Test Practice 1-9, p. 842.