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Blue streak
Lapis lazuli There are a few minerals that have a bright blue streak. Linarite often forms as a crust of tiny crystals on other minerals. It has an intense blue colour and a bright blue streak.

Azurite and lazurite have blue streaks - both have been powdered and used to make blue paints. Lazurite is usually found combined with other minerals to form the semi-precious stone called lapis lazuli.

Linarite Azurite Lazurite
Linarite (left), azurite (centre) and lazurite (right) are minerals with a blue streak.

Return to the Streak plates to learn more about mineral streak.