Matter and Minerals Matter and Minerals Geology for Engineers.

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Prentice Hall EARTH SCIENCE
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Presentation transcript:

Matter and Minerals Matter and Minerals Geology for Engineers

Content Definition Composition of Minerals

Minerals: Building blocks of rocks Minerals: Building blocks of rocks By definition a mineral isBy definition a mineral is Naturally occurringNaturally occurring Inorganic solidInorganic solid Ordered internal molecular structureOrdered internal molecular structure Definite chemical compositionDefinite chemical composition RockRock A solid aggregate of mineralsA solid aggregate of minerals

Composition of minerals Composition of minerals Elements Basic building blocks of minerals Over 100 are known (92 naturally occurring) Atoms Smallest particles of matter Retains all the characteristics of an element

Composition of minerals Composition of minerals Atomic structure Central region called the nucleus –Consists of protons (+ charges) and neutrons (- charges) Electrons –Negatively charged particles that surround the nucleus –Located in discrete energy levels called shells

Structure of an atom

Composition of minerals Chemical bonding Formation of a compound by combining two or more elements Ionic bonding Atoms gain or lose outermost (valence) electrons to form ions Ionic compounds consist of an orderly arrangement of oppositely charged ions

Halite (NaCl) – An example of ionic bonding

Composition of minerals Composition of minerals Covalent bonding Atoms share electrons to achieve electrical neutrality Generally stronger than ionic bonds Both ionic and covalent bonds typically occur in the same compound

Covalent bonding

Composition of minerals Other types of bonding Metallic bonding –Valence electrons are free to migrate among atoms –Weaker and less common than other bonds

Composition of minerals Isotopes and radioactive decay Mass number = sum of neutrons + protons in an atom Isotope = atom that exhibits variation in its mass number Unstable isotopes emit particles and energy in a process known as radioactive decay

Structure of minerals Structure of minerals Minerals consist of an orderly array of atoms chemically bonded to form a particular crystalline structure Internal atomic arrangement in ionic compounds is determined by ionic size

Geometric packing of various ions

Structure of minerals Polymorphs Minerals with the same composition but different crystalline structures Examples include diamond and graphite »Phase change = one polymorph changing into another

Diamond and graphite polymorphs

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