Magnetism Feel Taste Smell Optical Properties Magnetism Lodestone natural compass Magnetite Feel Graphite feels greasy Talc feels soapy Taste Halite is rock salt so it tastes salty ID: 322746
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Slide1
Special Properties of Minerals
Magnetism Feel
Taste
Smell
Optical PropertiesSlide2
Magnetism
Lodestone – natural compass
MagnetiteSlide3
Feel
Graphite
feels greasy
Talc
feels soapySlide4
Taste
Halite
is rock salt, so it tastes salty.
Halite
is not always cube-shaped, but it always
tastes salty
.Slide5
Smell
Sulfur
– smells like match headsSlide6
Special Properties
Striations
TourmalineSlide7
Striations on Pyrite
CrystalsSlide8
Striations usually run lengthwise…
Imperial TopazSlide9
Striations on Quartz run crosswise rather than lengthwise.Slide10
Iridescence
The
mixing of reflected light rays is called
interference
. Constructive Interference - wavelengths of light are in phase
and are strengthened (amplified)
Destructive Interference - wavelengths of light are out of phase and are cancelled
out
Optical PropertiesSlide11
Optical Properties
Iridescent Soap Bubbles
Thin film = magenta color
Thick film = blue colorSlide12
Optical Properties
Iridescence
Chalcopyrite
”Peacock Ore”
Labradorite
”Schiller
”
(Internal Iridescence)Slide13
Optical Properties
Iridescence
Opal
”Opalescence”Slide14
“Cats Eye”
“Tiger Eye”Slide15
Star Ruby
Star Sapphire
Golden Star SapphireSlide16
Optical Properties
Total Internal Reflection
Optic Fibers
Fiber Optic CableSlide17
Optical Properties
Total Internal Reflection
Optic Fibers
Needle-like Ulexite CrystalsSlide18
Optical Properties
Total Internal Reflection
in
Ulexite
- the
“TV
Rock”Slide19
Optical Properties
Polarized LightSlide20
Optical Properties
Iceland Spar
Calcite creates a double image
Double RefractionSlide21
Optical Properties
Iceland Spar Polarizes Light:Slide22
Optical Properties
Iceland
Spar Calcite
Double RefractionSlide23
Rock Thin Sections
White Light
Viewed through Crossed PolarizersSlide24
Crossed Polarizers make crystals of different minerals easier to tell apart:Slide25
Optical Properties
Polarized filters enhance photos..Slide26
Optical Properties
The sky is polarized.Slide27
Optical Properties
FluorescenceSlide28Slide29
Optical Properties
Iridescence
Constructive Interference (Orange) Enhances Color
Destructive Interference (Green) – Reduces Color
Orange
light is bright.
Green
light is absent.