Minerals: Minerals: Building Blocks of Building Blocks of Rocks Rocks ~Chapter 5 ~Chapter 5 ~ ~ ^_^ ^_^
Feb 25, 2016
Minerals: Minerals: Building Blocks Building Blocks
of Rocksof Rocks~Chapter 5~Chapter 5~~
^_^ ^_^
Minerals: the building Minerals: the building
blocks of rocks blocks of rocks Definition of a Definition of a mineralmineral • NaturalNatural• InorganicInorganic• SolidSolid• Possess an orderly internal Possess an orderly internal structure of atomsstructure of atoms
• Have a definite chemical Have a definite chemical compositioncomposition
Composition and Composition and structure of minerals structure of minerals AtomsAtoms
• Smallest particles of matterSmallest particles of matter
• ElementsElements • Basic building blocks of Basic building blocks of minerals minerals
• Over 100 are knownOver 100 are known
Periodic table of the Periodic table of the ElementsElements
How atoms are How atoms are constructed constructed
NucleusNucleus – central part of an atom – central part of an atom that containsthat contains • ProtonsProtons – positive electrical charges – positive electrical charges • NeutronsNeutrons – neutral electrical charges – neutral electrical charges• Have all the characteristics of an Have all the characteristics of an elementselements
Energy levels, or Energy levels, or shells shells • Surround nucleusSurround nucleus • Contain Contain electronselectrons – negative electrical – negative electrical chargescharges
Simplified view of the Simplified view of the atomatom
How atoms are How atoms are constructed constructed
Atomic numberAtomic number is the number of is the number of protons in an atom's nucleus protons in an atom's nucleus
Bonding of atoms Bonding of atoms • Forms a compound with two or more Forms a compound with two or more elements elements
• IonsIons are atoms that gain or lose are atoms that gain or lose electrons electrons
Isotopes Isotopes • Have varying number of neutrons Have varying number of neutrons
How atoms are How atoms are constructed constructed
Isotopes Isotopes • Have different mass numbers – Have different mass numbers – the sum of the neutrons plus the sum of the neutrons plus protons protons
• Many isotopes are radioactive Many isotopes are radioactive and emit energy and particles and emit energy and particles
Minerals Minerals Physical properties of minerals Physical properties of minerals
Crystal form Luster Color Streak Hardness Cleavage Fracture Other properties (taste, smell, elasticity, malleability, feel,
magnetism, double refraction)
Crystal Form
Luster
Cleavage
Streak
Hardness
Cleavage
Fracture
Other PropertiesCrystal Form
The mineral quartz The mineral quartz often exhibits good often exhibits good
crystal formcrystal form
Pyrite (fool’s gold) Pyrite (fool’s gold) displays metallic displays metallic
lusterluster
Three examples of Three examples of perfect cleavage – perfect cleavage – fluorite, halite, fluorite, halite,
and calciteand calcite
Conchoidal fractureConchoidal fracture
Minerals Minerals Physical properties of Physical properties of minerals minerals • Other propertiesOther properties
• FeelFeel• MagnetismMagnetism• Double RefractionDouble Refraction• Reaction to hydrochloric acid Reaction to hydrochloric acid
Minerals Minerals A few dozen minerals are called A few dozen minerals are called the rock-forming minerals the rock-forming minerals • The eight elements that compose most The eight elements that compose most rock-forming minerals are oxygen (O), rock-forming minerals are oxygen (O), silicon (Si), aluminum (Al), iron silicon (Si), aluminum (Al), iron (Fe), calcium (Ca), sodium (Na), (Fe), calcium (Ca), sodium (Na), potassium (K), and magnesium (Mg) potassium (K), and magnesium (Mg)
• Most abundant atoms in Earth's crust:Most abundant atoms in Earth's crust:• OxygenOxygen (46.6% by weight) (46.6% by weight)• S iliconS ilicon (27.7% by weight) (27.7% by weight)
Minerals Minerals Major Mineral groups Major Mineral groups
• Rock-forming Rock-forming silicatessilicates • Most common mineral group Most common mineral group • Contain the Contain the silicon-oxygen tetrahedronsilicon-oxygen tetrahedron
• Four oxygen atoms surrounding a Four oxygen atoms surrounding a much smaller silicon atommuch smaller silicon atom
• Feldspars are the most plentiful Feldspars are the most plentiful mineral group mineral group
• Crystallize from molten material Crystallize from molten material
Minerals Minerals Mineral groups Mineral groups
• Rock-formingRock-forming silicatessilicates : :• OlivineOlivine – independent tetrahedra – independent tetrahedra • Pyroxene groupPyroxene group – tetrahedra are – tetrahedra are arranged in chainsarranged in chains
• Amphibole groupAmphibole group – tetrahedra are – tetrahedra are arranged in double chains arranged in double chains
Hornblende – a member Hornblende – a member of of
the amphibole groupthe amphibole group
Minerals Minerals Mineral groups Mineral groups
• Rock-formingRock-forming silicatessilicates • MicasMicas – tetrahedra are arranged – tetrahedra are arranged in sheets in sheets Biotite and MuscoviteBiotite and Muscovite
• FeldsparsFeldspars - Blocky - Blocky• Two types- Two types- OrthoclaseOrthoclase and and PlagioclasePlagioclase
• QuartzQuartz – –
Potassium feldsparPotassium feldspar
Plagioclase Plagioclase feldsparfeldspar
Major Mineral groups:Major Mineral groups:Nonsilicate Mineral Groups:Nonsilicate Mineral Groups:
OxidesOxidesSulfidesSulfides CarbonatesCarbonates
• A major rock-forming groupA major rock-forming group• Found in the rocks Found in the rocks limestonelimestone and and marblemarble
• EvaporitesEvaporites• HaliteHalite and and gypsumgypsum are found in sedimentary are found in sedimentary rocksrocks
• Many have economic value Many have economic value
Native CopperNative Copper
Some common non-Some common non-silicate mineralssilicate minerals
Mineral resourcesMineral resources
• ReservesReserves are already identified are already identified depositsdeposits
• OresOres are useful metallic are useful metallic minerals that can be mined at a minerals that can be mined at a profit profit
• Economic factors may change and Economic factors may change and influence a resource influence a resource
An underground halite An underground halite (salt) mine(salt) mine
The Bingham copper The Bingham copper mine in Utahmine in Utah
Formative Mineral Quiz
Directions:Take out separate piece of paper and number 1-17For each slide, identify the mineral either based on how it looks or on the clue given.Correct quiz and record which ones you need study more!
Concoidal Fracture
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IDENTIFY IT!
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HCL Test (fizzing)
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Double Refraction
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IDENTIFY IT!
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Perfect Cleavage (3 at 90 deg.)- NO THER
HINTS!
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Definitely not gold… unless you’re a fool.
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Fibrous
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MOHS = 1
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Streak Test
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Magnetic… but the streak is throwing me
off
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Uber Magnetic
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Filmy… Flat… White…
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Black. Black starts with B.
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Metallic mineral. Ugly color.
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Looks like Pyrite… but its not
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Speckled. Reacts with Acid when powdered
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Answer Key1.1. Quartz (Box 1)Quartz (Box 1)2.2. Olivine ( Box 1)Olivine ( Box 1)3.3. Calcite (Box 1)Calcite (Box 1)4.4. Calcite (Box 1)Calcite (Box 1)5.5. Azurite ( Box 2)Azurite ( Box 2)6.6. Halite (Box 3)Halite (Box 3)7.7. Pyrite ( Box 2)Pyrite ( Box 2)8.8. Gypsum ( Box 1 OR 3)Gypsum ( Box 1 OR 3)9.9. Talc ( Box 3)Talc ( Box 3)10.10. Hematite ( Box 2)Hematite ( Box 2)11.11. Hematite ( Box 2)Hematite ( Box 2)12.12. Magnetite ( Box 2)Magnetite ( Box 2)13.13. Muscovite ( Box 1)Muscovite ( Box 1)14.14. Biotite ( Box 1)Biotite ( Box 1)15.15. Limonite ( Box 2)Limonite ( Box 2)16.16. Chalcopyrite ( Box 2)Chalcopyrite ( Box 2)17.17. Dolomite ( Box 3)Dolomite ( Box 3)