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: Optical Properties of Minerals

Opaque mineral

A mineral that does not allow light to pass through it

Allochromatic minerals

Minerals that display more than one color

Mineral streak

The color of a mineral in its powdered form that can be obtained by rubbing the mineral on a hard white surface

Mineral luster

The appearance of a mineral surface in terms of its light-reflecting qualities

Translucent mineral

A mineral that allows light to pass through it with light rays scattered and refracted at its surface

Transparent mineral

A mineral that allows light to pass through it without scattering

Play of color

An optical effect resulting in flashes of colored light from the surface of a mineral

Mineral transparency

The degree to which light can pass through a mineral

Mineral color

The optical property that is caused by the absorption or reflection of different wavelengths of white light

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