MINERALS

Streak

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The streak of a mineral is the color it displays in finely powdered form. The streak maybe completely different from the color of the hand specimen. One of the simpliest ways of determining the strak of a mineral is to rub a specimen across a piece of unglazed porcelain known as a streak plate.

Mineral
Color
Streak

Magnetite

Color: black

Streak: black/gray

Amphibole

Color: black

Streak: black/gray

Oolitic Hematite

Color: red

Streak: red/brown

Specular Hematite

Color: silver

Streak: red/brown

Calcite

Color: clear

Streak: white

Smoky Quartz

Color: gray

Streak: none

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©Guillermo Rocha/Brooklyn College