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Special Properties of Minerals Special Properties of Minerals

Special Properties of Minerals - PowerPoint Presentation

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Uploaded On 2016-05-16

Special Properties of Minerals - PPT Presentation

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

optical properties interference light properties optical light interference iridescence striations internal color optic polarized crystals iceland star reflection total double ulexite destructive

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Presentation Transcript

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

FluorescenceSlide28
Slide29

Optical Properties

Iridescence

Constructive Interference (Orange) Enhances Color

Destructive Interference (Green) – Reduces Color

Orange

light is bright.

Green

light is absent.