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: -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-3: -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-4: -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.

Detailed explanation-5: -Streak Plates While most minerals have a white streak, a few well-known minerals can be identified by the color of their streak. The simplest way to make a powder from a mineral sample is to grind the mineral on a small rectangular piece of unglazed ceramic called a streak plate.