Minerals and Atomic Structure Quiz

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Questions and Answers

What does the term 'cleavage' refer to in mineralogy?

  • The tendency to break along planes of weak bonding (correct)
  • The resistance of a mineral to abrasion
  • The ratio of the weight of a mineral to water
  • The color of a mineral in its powdered form

Which mineral property is tested using a streak plate?

  • Specific gravity
  • Streak (correct)
  • Fracture
  • Hardness

On the Mohs scale of hardness, which property does hardness measure?

  • Weight relative to water
  • Absence of cleavage
  • Color in powdered state
  • Resistance to abrasion or scratching (correct)

What is the average specific gravity of most minerals?

<p>2.5 to 3 (A)</p> Signup and view all the answers

Which of the following is considered a 'special' property of minerals?

<p>Reaction to hydrochloric acid (A)</p> Signup and view all the answers

What does a conchoidal fracture in a mineral indicate?

<p>It breaks to form smooth curved surfaces (D)</p> Signup and view all the answers

Which of the following elements is NOT one of the eight most abundant elements in Earth's continental crust?

<p>Copper (A)</p> Signup and view all the answers

Which of the following is NOT a characteristic that defines a mineral?

<p>Exists as a solid mass (D)</p> Signup and view all the answers

Which property of minerals is assessed by comparing their physical weight to an equal volume of water?

<p>Specific gravity (D)</p> Signup and view all the answers

What does the atomic number of an element represent?

<p>Number of protons in the nucleus (D)</p> Signup and view all the answers

How is the resistance of a mineral to scratching measured?

<p>Using the Mohs scale of hardness (A)</p> Signup and view all the answers

Which of the following best describes the definition of 'fracture' in minerals?

<p>Breaking without forming smooth or flat surfaces (B)</p> Signup and view all the answers

Which type of bond involves one atom giving up electrons while another atom receives them?

<p>Ionic bond (A)</p> Signup and view all the answers

What is the primary difference between a mineral and a rock?

<p>Rocks are aggregates of minerals or mineral-like matter (D)</p> Signup and view all the answers

In atomic structure, which subatomic particle is located in the nucleus with a positive charge?

<p>Proton (B)</p> Signup and view all the answers

What is meant by 'valence electrons'?

<p>Outer-most electrons that are involved in bonding (B)</p> Signup and view all the answers

How many naturally occurring elements are known?

<p>90 (D)</p> Signup and view all the answers

Which statement is correct regarding the nature of minerals?

<p>Minerals are naturally occurring inorganic substances (B)</p> Signup and view all the answers

Which of the following best describes an atom?

<p>The smallest particle of a chemical element (C)</p> Signup and view all the answers

What determines the atomic weight of an atom?

<p>The total number of protons and neutrons (A)</p> Signup and view all the answers

What happens to oppositely-charged atoms when they bond together?

<p>They attract, bond, and become electrically neutral. (A)</p> Signup and view all the answers

What is a unique characteristic of a mineral's crystal habit?

<p>It represents the external form of the internal atomic arrangement. (B)</p> Signup and view all the answers

Which of the following best describes a polymorph?

<p>A material whose physical properties vary despite a constant chemical composition. (B)</p> Signup and view all the answers

What is the primary factor affecting the crystal growth of minerals?

<p>Competitive space availability and temperature changes. (B)</p> Signup and view all the answers

How is lustre categorized in minerals?

<p>By appearance in reflected light: metallic or non-metallic. (D)</p> Signup and view all the answers

Which mineral is known for exhibiting a diverse range of colors due to impurities?

<p>Quartz. (D)</p> Signup and view all the answers

What aspect typically does not contribute to the identification of minerals?

<p>The color of the mineral alone. (D)</p> Signup and view all the answers

What results in the formation of different physical properties in polymorphs despite having the same chemical composition?

<p>Different environmental conditions during formation. (D)</p> Signup and view all the answers

What is the primary difference between metallic and non-metallic lustre?

<p>Metallic lustre reflects more light than non-metallic lustre. (C)</p> Signup and view all the answers

The term 'crystal habit' primarily refers to which aspect of a mineral?

<p>The external shape and form exhibited by the mineral. (C)</p> Signup and view all the answers

What is the basic building block of the silicate minerals?

<p>Silicon-oxygen tetrahedron (A)</p> Signup and view all the answers

Which of the following structures is NOT a configuration formed by linking silicate tetrahedra?

<p>Cube structures (A)</p> Signup and view all the answers

Which mineral is classified as a ferromagnesian silicate?

<p>Biotite (C)</p> Signup and view all the answers

Which of the following is NOT a characteristic of nonferromagnesian silicates?

<p>Contains iron or magnesium (C)</p> Signup and view all the answers

Which type of mineral does NOT belong to the non-silicate mineral classification?

<p>Tetrahedra (A)</p> Signup and view all the answers

Muscovite is categorized under which mineral group?

<p>Nonferromagnesian silicates (C)</p> Signup and view all the answers

Which of the following groups does NOT represent a major type of non-silicate mineral?

<p>Garnets (D)</p> Signup and view all the answers

What is the most common ferromagnesian mineral listed?

<p>Olivine (D)</p> Signup and view all the answers

Which of the following is a light silicate mineral?

<p>Clay (D)</p> Signup and view all the answers

Which silicate structure includes combinations of different arrangements of tetrahedra?

<p>All of the above (D)</p> Signup and view all the answers

Flashcards

What is a mineral?

A naturally occurring, solid, inorganic substance with a definite chemical composition and ordered internal structure.

What is a rock?

A solid mass composed of one or more minerals, or mineral-like materials, found naturally.

What are elements?

The fundamental building blocks of all matter.

What is an atom?

The smallest unit of an element that retains the chemical properties of that element.

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What is the nucleus of an atom?

The central region of an atom, composed of protons (positive charge) and neutrons (no charge).

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What are electrons?

Negatively charged particles that orbit the nucleus of an atom, located in specific energy levels called shells.

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What is the atomic number?

The number of protons in the nucleus of an atom.

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What is the atomic weight?

The approximate total number of protons and neutrons in the nucleus of an atom.

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What are valence electrons?

The outermost electrons in an atom's shell, which are involved in chemical bonding.

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What is a chemical bond?

A strong attractive force that holds atoms together to form compounds.

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Covalent bond

A chemical bond formed when atoms share electrons to achieve a stable outer shell.

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Ionic bond

Positively charged atoms are attracted to negatively charged atoms, forming a bond.

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Mineral

A solid with a specific, ordered arrangement of atoms.

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Polymorph

A substance with the same chemical composition but different crystal structures, leading to different physical properties.

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Crystal habit

The shape of a mineral resulting from the internal arrangement of its atoms.

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Lustre

The way a mineral's surface reflects light. Can be metallic or non-metallic.

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Color

The color of a mineral, but not always reliable for identification due to impurities.

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Quartz (SiO2)

A mineral with a specific chemical composition that can have different colors due to impurities.

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Oppositely charged atoms bond

Atoms with opposite charges (positive and negative) attract each other, forming a bond.

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Electrically neutral atoms

When oppositely charged atoms bond, they become electrically neutral.

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Streak

The color of a mineral's powder when rubbed against a streak plate (unglazed porcelain tile).

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Hardness

A mineral's resistance to scratching, measured using the Mohs Hardness Scale, which compares minerals against a set of 10 standard minerals.

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Cleavage

The way a mineral breaks along flat, smooth surfaces due to weak bonding planes.

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Fracture

An irregular, uneven break in a mineral that lacks cleavage.

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Specific Gravity

The ratio of a mineral's weight to the weight of an equal volume of water. It helps determine the mineral's density.

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Rock-Forming Minerals

A group of minerals, primarily composed of oxygen, silicon, aluminum, iron, calcium, sodium, potassium, and magnesium, that make up most of the Earth's crust.

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Magnetism

The tendency of some minerals to be attracted to a magnet. This is a special property not found in all minerals.

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Reaction to Hydrochloric Acid

The way a mineral reacts with hydrochloric acid (HCl). This is a special property used to identify some minerals like calcite.

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Malleability

The ability of a mineral to be hammered or flattened into thin sheets without breaking. This is a special property not found in all minerals.

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Double Refraction

The ability of some minerals to split light into two rays, creating a double image. This is a special property not found in all minerals.

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Silicates

The most abundant mineral group on Earth's continental crust, characterized by a basic building block called the silicon-oxygen tetrahedron (SiO4)4-. This tetrahedron consists of four oxygen ions surrounding a much smaller silicon ion, forming a complex ion.

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Silicon-oxygen tetrahedron (SiO4)4-

A complex ion in silicate minerals, consisting of a central silicon ion surrounded by four oxygen ions, forming a pyramid-shaped structure.

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Complex Silicate Structures

Silicate structures formed by linking silicon-oxygen tetrahedra together in various ways, creating single chains, double chains, sheet structures, and 3D frameworks.

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Ferromagnesian silicates

Silicate minerals containing iron and/or magnesium ions, typically darker in color.

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Nonferromagnesian silicates

Silicate minerals containing various amounts of aluminum, potassium, calcium, and sodium, typically lighter in color.

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Olivine

A common ferromagnesian silicate mineral, often found in igneous rocks.

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Pyroxenes (Augite)

A group of ferromagnesian silicate minerals, commonly found in igneous and metamorphic rocks.

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Amphiboles (Hornblende)

A group of ferromagnesian silicate minerals, known for their complex crystal structures.

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Muscovite

A common nonferromagnesian silicate mineral, known for its flaky appearance and its use in cosmetics and construction.

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Feldspar (Orthoclase and Plagioclase)

A group of nonferromagnesian silicate minerals, known for their wide variety and use in various industries.

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Study Notes

Minerals: The Building Blocks of Rocks

  • Rocks are aggregates of several kinds of minerals
  • Minerals are naturally occurring, inorganic solids with an ordered internal molecular structure and a definite chemical composition. Ice is a mineral, but glass is not.
  • Rocks are solid masses of minerals or mineral-like matter that occur naturally.

The Composition of Minerals

  • Elements are the basic building blocks of minerals. There are 118 known elements, with 90 occurring naturally.
  • Atoms are the smallest particles of matter, retaining all the characteristics of an element. Atoms contain a nucleus (protons and neutrons) and electrons.

Atomic Structure

  • The nucleus is the central region of an atom, comprised of protons (positive charges) and neutrons (no electrical charge).
  • Electrons are negatively charged particles surrounding the nucleus, occupying discrete energy levels called shells.
  • Atomic number is the number of protons in an atom
  • Atomic weight is approximately the total number of protons and neutrons in an atom's nucleus
  • Valence electrons are the atom's outer-most electrons in the outermost shell

Bonding

  • Chemical bonds are strong attractive forces forming compounds.
  • Ionic bonds occur when one atom gives up an electron(s) and another receives them. These oppositely charged ions are attracted to each other, forming an ionic bond and becoming electrically neutral.
  • Covalent bonds involve atoms sharing electrons.

The Structure of Minerals

  • Minerals consist of an ordered array of atoms chemically bonded to form a particular crystalline structure.
  • Polymorphs are elements that can join in various geometric arrangements while maintaining the same chemical composition. Physical properties of polymorphs can differ. Diamond and graphite are examples of polymorphs.

Physical Properties of Minerals

  • Crystal habit (shape): The external expression of the internal atomic arrangement. Crystal growth can be interrupted by competition for space and rapid heat loss.
  • Lustre: The appearance of a mineral in reflected light. Two basic types include metallic and non-metallic.
  • Colour: Color can be an aid in mineral identification, but should not be used in isolation.
  • Streak: The colour of a mineral in its powdered form, observed when rubbed on an unglazed porcelain tile (streak plate).
  • Hardness: The resistance to abrasion or scratching. Compared using the Mohs scale of hardness.
  • Cleavage: A mineral's tendency to break along planes of weak bonding, producing flat, shiny surfaces. Minerals are described with a count of cleavage planes, and the angles between planes.
  • Fracture: Minerals without cleavage break along irregular surfaces, but sometimes break to form curved surfaces
  • Specific gravity: The ratio of the weight of a mineral to the weight of an equal volume of water.
  • Other properties: Including magnetism, reaction to hydrochloric acid, malleability, double refraction, taste, smell and elasticity.

Mineral Classes

  • Approximately 4660 minerals have been identified. Rock-forming minerals make up most of Earth's crust.
  • Composed mainly of the eight most abundant elements (oxygen, silicon, aluminum, iron, calcium, sodium, potassium, and magnesium).
  • Silicates: The most common mineral group, with silicon-oxygen structural units. Tetrahedra units link together forming various structures
  • Non-silicate Minerals: Including oxides, hydroxides, sulfides, sulfates, native elements, halides, carbonates, and phosphates.

Gemstones

  • Gemstones are classified by their composition, not just their colour. Different cuts and colours are possible from the same gemstone mineral

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