Lab #4: Minerals: Building Blocks of Rocks

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1 Lab #4: Minerals: Building Blocks of Rocks Minerals: Building Blocks of Rocks By definition a mineral is/has Naturally occurring Inorganic solid Ordered internal molecular structure Definite chemical composition Rock A solid aggregate of minerals Composition and Structure Elements Basic building blocks of minerals Over 100 are known (92 naturally occurring) Atoms Smallest particles of matter Retain all the characteristics of an element 1

2 Composition and Structure 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 Figure 1.5 A Composition and Structure of Minerals Chemical bonding Formation of a compound by combining two or more elements Atoms gain or lose outermost electrons to form ions Oppositely charged ions attract one another to produce a neutral chemical compound 2

3 Composition and Structure 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 Physical Properties Crystal form External expression of a mineral s internal structure Often interrupted due to competition for space and rapid loss of heat A Garnet Crystal 3

4 Cubic Crystals of Pyrite Figure 1.7 A Physical Properties Luster Appearance of a mineral in reflected light Two basic categories Metallic Nonmetallic Other descriptive terms include vitreous, silky, or earthy Galena (PbS) Displays Metallic Luster Figure

5 Physical Properties Color Generally unreliable for mineral identification Often highly variable due to slight changes in mineral chemistry Exotic colorations of certain minerals produce gemstones Quartz (SiO 2 ) Exhibits a Variety of Colors Physical Properties Streak Color of a mineral in its powdered form Hardness Resistance of a mineral to abrasion or scratching All minerals are compared to a standard scale called the Mohs scale of hardness 5

6 Streak Is Obtained on an Unglazed Porcelain Plate Figure 1.8 Mohs Scale of Hardness Figure 1.9 Physical Properties Cleavage Tendency to break along planes of weak bonding Produces flat, shiny surfaces Described by resulting geometric shapes Number of planes Angles between adjacent planes 6

7 Fluorite, Halite, and Calcite All Exhibit Perfect Cleavage Figure 1.11 Physical Properties Fracture Absence of cleavage when a mineral is broken Specific Gravity Weight of a mineral/weight of an equal volume of water Average value = Conchoidal Fracture Figure

8 Physical Properties Other properties Magnetism Reaction to hydrochloric acid Malleability Double refraction Taste Smell Elasticity Mineral Groups Nearly 4000 minerals have been named Rock-forming minerals Common minerals that make up most of the rocks of Earth s s crust Only a few dozen members Composed mainly of the 8 elements that make up over 98% of the continental crust Elemental Abundances in Continental Crust Figure

9 Mineral Groups Silicates Most important mineral group Comprise most rock-forming minerals Very abundant due to large % of silicon and oxygen in Earth s s crust Silicon-oxygen oxygen tetrahedron Fundamental building block Four oxygen ions surrounding a much smaller silicon ion Two Illustrations of the Si O Tetrahedron Figure 1.15 Mineral Groups Common silicate minerals Feldspar group Most common mineral group Quartz Only common silicate composed entirely of oxygen and silicon 9

10 Potassium Feldspar Figure 1.17 Mineral Groups Important nonsilicate minerals Comprise only 8% of Earth s s crust Often occur as constituents in sedimentary rocks Table

11 Mineral Groups Important nonsilicate minerals Carbonates Primary constituents in limestone and marble Limestone is used commercially for road paving, building stone, and as the main ingredient in Portland cement Mineral Groups Important nonsilicate minerals Halite and gypsum Both are commonly found in thick layers Like limestone, both halite and gypsum are important nonmetallic resources Mineral Groups Important nonsilicate minerals A number of other minerals have economic value Examples Hematite (oxide mined for iron ore) Sphalerite (sulfide mined for zinc ore) Galena (lead) Native copper (native element mined for copper) 11

12 Native Copper Complete Lab #4: Minerals 12

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