GENERAL GEOLOGY

Detailed explanation-1: -The mineral which is almost black but gives brown streak is? Explanation: Chromite and magnetite resemble closely in their other physical properties: both are almost black. These may be at once distinguished by their streaks: brown for chromite and black for magnetite.

Detailed explanation-2: -Some minerals leave a streak similar to their natural color, such as cinnabar, lazurite and native gold. Other minerals leave surprising colors, such as fluorite, which always has a white streak, although it can appear in purple, blue, yellow, or green crystals.

Detailed explanation-3: -The color of a mineral in powdered form is called the mineral’s streak. To find a mineral’s streak, the mineral is rubbed against a piece of unglazed porcelain called a streak plate. The mark left on the streak plate is the streak.

Detailed explanation-4: -What is the colour and streak of olivine respectively? Explanation: The olivine mineral is found in olive green colour and hence its name. The streak given by olivine is white.

Detailed explanation-5: -Calcite has a glassy luster; its streak is white or colorless. The mineral is of medium hardness and can be scratched by a penny but not by a fingernail. Specific gravity is 2.71.