For the Majority of Minerals,the Streak Color Obtained When the Mineral

question 23

Multiple Choice

For the majority of minerals,the streak color obtained when the mineral is scratched against a porcelain plate is ________.

• A)only useful if the mineral is softer than porcelain
• B)more variable than the color in a hand sample among crystals
• C)not useful because the porcelain will often chemically react with the mineral
• D)always dark brown or black

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Definitions:

Light Waves

Electromagnetic waves that are visible to the human eye.

Sound Waves

Vibrations that travel through the air or another medium and can be heard when they reach an ear.

Wavelength

The distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.

Opponent-Process Theory

A psychological and neurological model that explains how the perception of colors is controlled by two opposing systems, leading to color vision.