tuesday november 02, 2010 update your planner. set up your cornell notes. today’s theme: what...
TRANSCRIPT
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Tuesday November 02, 2010 Update your planner. Set up your Cornell notes.
Today’s Theme: What is a mineral?– What are the ways that minerals can be identified?– What defines whether something is a mineral or not?– What is a crystal?– What is the difference between a rock and a mineral?
Hand in any late work Progress Reports Tomorrow (Due Thursday) Science Fair Complete Write Up Due Friday!!!!!!!!! OMG
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Friday November 05, 2010
Open books to page 66.
Turn in science fair project.
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MineralsToday: Use your keen powers of observation to
make a list in your notebook of all of the physical properties you notice about the seven samples.
Think about these questions:– Are they all minerals?– Why do they look the way they do?– How did they form?– What are they composed of?– Where did they come from?
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Grouping Physical Properties 5 Minutes
How many different ways can you put these samples into different groups– See how many you can think of and write them down– We will share them with the rest of the class
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Wednesday November 03, 2010
Please write today’s lesson and date in your notebook.– Today’s lesson: How do we identify minerals?
• What are the physical properties of minerals?
• How do we tell minerals apart?
• Why do minerals have different properties
Textbooks open to Page 70
Please do not touch equipment yet!!!!
Science Fair Complete Write Up is due Friday.
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Properties of Minerals Learning Objectives
– What are the ways that minerals can be identified?
– What is Moh’s Hardness Scale?
– What is the difference between cleavage and fracture?
– What are some common uses for minerals?
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What is a mineral?
A mineral is– Naturally Occurring (made by earth-not man made),– Inorganic (never was alive),– Solid (atoms in fixed position, definite volume/shape),– with a definite crystal structure (repeating pattern of
minerals atoms),– and a definite chemical composition (same elements
throughout in a certain proportion)
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Which of these are minerals?Which of these are minerals?Which of these are minerals?Which of these are minerals?AMBER COAL
PEARL
SUGAR
QUARTZ
HALITE
MICA
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Salesite
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Gold
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Fluorite
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Tiptopite (clear) & Montgomeryite
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Acanthite
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Chrysotile
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Gypsum
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Pyrite
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Feldspar
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Physical Properties of Minerals
These properties are used to identify minerals
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1. Color
Color is the most noticeable physical property of a mineral but is THE LEAST reliable.
This is because the same mineral can come in many colors.
Example:
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Mineral IdentificationMineral Identification
rhodochrosite malachite turquoise
azuriteColor is one physical property that can beused to identify minerals but beware……
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The many colors of Calcite
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The many colors of Quartz
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2. Streak:The color of the powdered form of a mineral when
rubbed on an unglazed porcelain plate
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StreakThe mineral is rubbed on an unglazed
porcelain plate to determine the color of the streak powder.
Not all minerals have a streak. Any mineral harder than the plate (7+) will leave a scratch instead.
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Streak Example: Same Mineral!
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3. LusterLuster describes how light is reflected from a
mineral’s surface.
A mineral has either – Metallic Luster (shines like a metal) or – Non-Metallic Luster.
• Dull, earthy, waxy, greasy, pearly, silky or vitreous (glassy)
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Luster:
The mineral The mineral Galena has a Galena has a metallic lustermetallic luster
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Metallic Luster Non-Metallic Luster
Examples of Luster
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Metallic or Nonmetallic?
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Metallic or Nonmetallic?
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Metallic or Nonmetallic?
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Density
Density is the comparison of mass to volume.– It’s really how well packed are the atoms in the
object.
Mass divided by volume
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Thursday November 04, 2010
Please write today’s lesson and date in your notebook.– Today’s lesson: How do we identify minerals?
• What are the physical properties of minerals?
• How do we tell minerals apart?
• Why do minerals have different properties
Textbooks open to Page 72
Please do not touch equipment yet!!!!
Science Fair Complete Write Up is due Friday.
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Physical Properties that Identify Minerals (so far)
Color Streak Luster (metallic or non-metallic) Density Hardness Crystal Systems Texture ……the rest today
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5. HardnessHardness is a measure of how easily a mineral
is scratched.
– determined by arrangement of the mineral’s atoms.
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Mohs Hardness Scale:a relative scale used to determine the mineral’s hardness
Fingernail Penny Iron Nail Glass Streak Plate
2.5 3.5 4.55.5
6.5
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Crystal Systems
The way the mineral grows atom by atom makes a shape we call a crystal.– Most of the time you can’t see them.– More time and space it had to grow = bigger crystals
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
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Crystal FormsThese are Quartz
CrystalsThese are These are Quartz CrystalsQuartz Crystals
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7. Texture Texture describes how a mineral feels to the touch. Texture can be described as greasy, soapy, glassy, rough,
ragged or smooth. Graphite has a greasy texture.
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Cleavage or Fracture The way minerals break. Cleavage - When Minerals break along planes (layers) where
bonding between atoms is weak.
A mineral that splits or breaks easily along smooth, flat surfaces is said to have cleavage.
•Mica has perfect cleavage in one direction (plane).
•Halite has cubic cleavage (3 planes).
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Three Examples of Perfect Cleavage – Fluorite, Halite & Calcite
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Cleavage of Minerals
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Cleavage
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Cleavage or Fracture
Minerals that break along rough, jagged or uneven edges and surfaces are said to have fracture.– conchoidal (shell-like), splintery, uneven, jagged or
earthy
Conchoidal Example :Quartz
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Don’t be confused between Crystal Faces (sides) and Cleavage Planes! - Both minerals in these pictures show Fracture (not cleavage)
These are These are Quartz CrystalsQuartz Crystals
These are These are Quartz CrystalsQuartz Crystals
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Special Properties
Specific gravityReaction to acidStriations (lines)MagnetismFluorescenceRefraction
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Uses of MineralsGems or Gemstones are highly prized minerals
because they are rare and beautiful.An Ore is a mineral that contains a useful
substance that can be mined at a profit.
Ore Name Gives Us
Hematite Iron
Chalcopyrite Copper
Bauxite Aluminum
Sphalerite Zinc
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Uses of MineralsUses of MineralsGems: Gems: Valuable Valuable minerals minerals prized for prized for rarity and rarity and beauty.beauty.
Ores: Ores: Minerals that Minerals that can be mined can be mined at a profit.at a profit.
Gems: Gems: Valuable Valuable minerals minerals prized for prized for rarity and rarity and beauty.beauty.
Ores: Ores: Minerals that Minerals that can be mined can be mined at a profit.at a profit.
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Uses of Minerals http://www.minsocam.org/MSA/K12/uses/uses.html
http://www.emporia.edu/earthsci/amber/go336/talkingt/
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The Copper Queen Mine in Bisbee, AZ
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An Underground Halite Mine
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Birthstones January Garnet or Rose Quartz February Amethyst or Onyx March Aquamarine or Bloodstone April Diamond or Quartz Crystal May Emerald or Crysoprase June Alexandrite or Moonstone or Pearl July Ruby or Carnelian August Peridot or Sardonyx September Sapphire or Lapis October Opal or Tourmaline November Topaz or Citrine December Tanzanite, Zircon or Turquoise
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History of Birthstones In early times, gemstones were believed to possess magical
properties. Some minerals were thought to contain a force or hold certain values and powers.
Tradition associates a gem with each sign of the zodiac based on a color system. Color was thought to unleash the power attributed to the stone.
The Roman, Arabic, Jewish, Polish, Russian and Italian birthstone lists were all different.
In time, birthstones became associated with calendar months rather than the zodiac.
And people began to select birthstones in colors other than the original.
This list of birthstones, which is the one commonly used today, was adopted in 1912 by the American National Association of Jewelers, which later evolved into the Jewelers of America.
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Mineral Compositions and Groups
Minerals are grouped based on their chemical composition (the elements that make up the minerals).
Almost 98% of the Earth’s crust is made of only 8 common elements (O, Si, Al, Fe, Ca, Na, K, Mg).
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Silicon (Si) and Oxygen (O) are the most common elements in the Earth’s crust.
Major groups are….(In order of size)• Silicates (Si, O) (Largest rock forming group)
• Carbonates (CO3)
• Oxides (O3, O4)
• Sulfides (SO4)
• Sulfates (SO3)
• Halides (F, Cl, I, Br)
• Hydroxides (OH)2
• Phosphates (PO3)
• Native Elements (Au, Ag, Cu)
Mineral Compositions and Groups
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Mineral Compositions and GroupsMineral Compositions and Groups
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Examples of SilicatesHornblende
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Examples of SilicatesOrthoclase Feldspar
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Examples of SilicatesPlagioclase Feldspar
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Carbonates
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Sulfates
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Halides
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Native ElementCopper
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Monday November 08, 2010
Mineral Identification Lab Today– Please leave materials alone until instructed– Clear desks except for a pencil (preferred)– Put stuff under tables in back
Hand in Science Fair lab Write Up
Presentation Posters Due Thursday!