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 simplest ways of determining the streak of a mineral is to rub a specimen across a piece of unglazed porcelain known as a streak plate.

Mineral Streak Test Video

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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