Cleavage is the ability of a mineral to split apart easily along flat surfaces and it is dependent on the mode of formation and properties of the mineral.
Luster is the way light is reflected from the surface of the mineral. Some minerals allows a greater reflection of light due to their shiny surfaces while some don’t.
Streak is the color of the mineral's powder which are its unique components and also helps in the identification of minerals.
Hardness of a mineral can be measured by the Mohs scale. This is usually measured on a scale of 1-10. The hardest being 10 on the scale.
