STREAK
The streak of a mineral is the colour of its powder as seen on a white surface. It is often quite different from that of a larger piece of the mineral, and can be a diagnostic feature used in mineral identification. Pyrite crystals, for instance, are yellow, but the powder of pyrite is greenish-black. The streak of the black minerals, blende, limonite and haematite, is respectively leather-brown, yellowish-brown and blood-red. Many mineral identification tables are based on the colour of streak, as this provides a simple means of distinguishing between many superficially similar minerals. Streak is readily observed by rubbing the mineral on a tablet of unglazed porcelain.
Streak of a mineral
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