Special Properties of Minerals

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Presentation transcript:

Special Properties of Minerals Magnetism Feel Taste Smell Optical Properties

Magnetism Magnetite Lodestone – natural compass

Feel Graphite feels greasy Talc feels soapy

Taste Halite is rock salt, so it tastes salty. Halite is not always cube-shaped, but it always tastes salty.

Smell Sulfur – smells like match heads

Special Properties Striations Tourmaline

Striations on Pyrite Crystals

Striations usually run lengthwise… Imperial Topaz

Striations on Quartz run crosswise rather than lengthwise.

Iridescence Optical Properties 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 Properties Iridescent Soap Bubbles Thin film = magenta color Thick film = blue color

Iridescence Optical Properties Chalcopyrite ”Peacock Ore” Labradorite ”Schiller” (Internal Iridescence)

Optical Properties Iridescence Opal ”Opalescence”

“Cats Eye” “Tiger Eye”

Star Sapphire Star Ruby Golden Star Sapphire

Optical Properties Total Internal Reflection Optic Fibers Fiber Optic Cable

Optical Properties Total Internal Reflection Optic Fibers Needle-like Ulexite Crystals

Optical Properties Total Internal Reflection in Ulexite - the “TV Rock”

Optical Properties Polarized Light

Optical Properties Double Refraction Iceland Spar Calcite creates a double image

Optical Properties Iceland Spar Polarizes Light:

Optical Properties Double Refraction Iceland Spar Calcite

Viewed through Crossed Polarizers Rock Thin Sections White Light Viewed through Crossed Polarizers

Crossed Polarizers make crystals of different minerals easier to tell apart:

Polarized filters enhance photos.. Optical Properties Polarized filters enhance photos..

Optical Properties The sky is polarized.

Optical Properties Fluorescence

Iridescence Optical Properties Orange light is bright. Green light is absent. Constructive Interference (Orange) Enhances Color Destructive Interference (Green) – Reduces Color

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