Podcast
Questions and Answers
What does the term 'cleavage' refer to in mineralogy?
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?
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?
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?
What is the average specific gravity of most minerals?
Which of the following is considered a 'special' property of minerals?
Which of the following is considered a 'special' property of minerals?
What does a conchoidal fracture in a mineral indicate?
What does a conchoidal fracture in a mineral indicate?
Which of the following elements is NOT one of the eight most abundant elements in Earth's continental crust?
Which of the following elements is NOT one of the eight most abundant elements in Earth's continental crust?
Which of the following is NOT a characteristic that defines a mineral?
Which of the following is NOT a characteristic that defines a mineral?
Which property of minerals is assessed by comparing their physical weight to an equal volume of water?
Which property of minerals is assessed by comparing their physical weight to an equal volume of water?
What does the atomic number of an element represent?
What does the atomic number of an element represent?
How is the resistance of a mineral to scratching measured?
How is the resistance of a mineral to scratching measured?
Which of the following best describes the definition of 'fracture' in minerals?
Which of the following best describes the definition of 'fracture' in minerals?
Which type of bond involves one atom giving up electrons while another atom receives them?
Which type of bond involves one atom giving up electrons while another atom receives them?
What is the primary difference between a mineral and a rock?
What is the primary difference between a mineral and a rock?
In atomic structure, which subatomic particle is located in the nucleus with a positive charge?
In atomic structure, which subatomic particle is located in the nucleus with a positive charge?
What is meant by 'valence electrons'?
What is meant by 'valence electrons'?
How many naturally occurring elements are known?
How many naturally occurring elements are known?
Which statement is correct regarding the nature of minerals?
Which statement is correct regarding the nature of minerals?
Which of the following best describes an atom?
Which of the following best describes an atom?
What determines the atomic weight of an atom?
What determines the atomic weight of an atom?
What happens to oppositely-charged atoms when they bond together?
What happens to oppositely-charged atoms when they bond together?
What is a unique characteristic of a mineral's crystal habit?
What is a unique characteristic of a mineral's crystal habit?
Which of the following best describes a polymorph?
Which of the following best describes a polymorph?
What is the primary factor affecting the crystal growth of minerals?
What is the primary factor affecting the crystal growth of minerals?
How is lustre categorized in minerals?
How is lustre categorized in minerals?
Which mineral is known for exhibiting a diverse range of colors due to impurities?
Which mineral is known for exhibiting a diverse range of colors due to impurities?
What aspect typically does not contribute to the identification of minerals?
What aspect typically does not contribute to the identification of minerals?
What results in the formation of different physical properties in polymorphs despite having the same chemical composition?
What results in the formation of different physical properties in polymorphs despite having the same chemical composition?
What is the primary difference between metallic and non-metallic lustre?
What is the primary difference between metallic and non-metallic lustre?
The term 'crystal habit' primarily refers to which aspect of a mineral?
The term 'crystal habit' primarily refers to which aspect of a mineral?
What is the basic building block of the silicate minerals?
What is the basic building block of the silicate minerals?
Which of the following structures is NOT a configuration formed by linking silicate tetrahedra?
Which of the following structures is NOT a configuration formed by linking silicate tetrahedra?
Which mineral is classified as a ferromagnesian silicate?
Which mineral is classified as a ferromagnesian silicate?
Which of the following is NOT a characteristic of nonferromagnesian silicates?
Which of the following is NOT a characteristic of nonferromagnesian silicates?
Which type of mineral does NOT belong to the non-silicate mineral classification?
Which type of mineral does NOT belong to the non-silicate mineral classification?
Muscovite is categorized under which mineral group?
Muscovite is categorized under which mineral group?
Which of the following groups does NOT represent a major type of non-silicate mineral?
Which of the following groups does NOT represent a major type of non-silicate mineral?
What is the most common ferromagnesian mineral listed?
What is the most common ferromagnesian mineral listed?
Which of the following is a light silicate mineral?
Which of the following is a light silicate mineral?
Which silicate structure includes combinations of different arrangements of tetrahedra?
Which silicate structure includes combinations of different arrangements of tetrahedra?
Flashcards
What is a mineral?
What is a mineral?
A naturally occurring, solid, inorganic substance with a definite chemical composition and ordered internal structure.
What is a rock?
What is a rock?
A solid mass composed of one or more minerals, or mineral-like materials, found naturally.
What are elements?
What are elements?
The fundamental building blocks of all matter.
What is an atom?
What is an atom?
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What is the nucleus of an atom?
What is the nucleus of an atom?
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What are electrons?
What are electrons?
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What is the atomic number?
What is the atomic number?
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What is the atomic weight?
What is the atomic weight?
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What are valence electrons?
What are valence electrons?
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What is a chemical bond?
What is a chemical bond?
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Covalent bond
Covalent bond
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Ionic bond
Ionic bond
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Mineral
Mineral
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Polymorph
Polymorph
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Crystal habit
Crystal habit
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Lustre
Lustre
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Color
Color
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Quartz (SiO2)
Quartz (SiO2)
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Oppositely charged atoms bond
Oppositely charged atoms bond
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Electrically neutral atoms
Electrically neutral atoms
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Streak
Streak
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Hardness
Hardness
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Cleavage
Cleavage
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Fracture
Fracture
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Specific Gravity
Specific Gravity
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Rock-Forming Minerals
Rock-Forming Minerals
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Magnetism
Magnetism
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Reaction to Hydrochloric Acid
Reaction to Hydrochloric Acid
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Malleability
Malleability
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Double Refraction
Double Refraction
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Silicates
Silicates
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Silicon-oxygen tetrahedron (SiO4)4-
Silicon-oxygen tetrahedron (SiO4)4-
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Complex Silicate Structures
Complex Silicate Structures
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Ferromagnesian silicates
Ferromagnesian silicates
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Nonferromagnesian silicates
Nonferromagnesian silicates
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Olivine
Olivine
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Pyroxenes (Augite)
Pyroxenes (Augite)
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Amphiboles (Hornblende)
Amphiboles (Hornblende)
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Muscovite
Muscovite
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Feldspar (Orthoclase and Plagioclase)
Feldspar (Orthoclase and Plagioclase)
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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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