Luster-99.9% sure!
No, a mineral's ability to reflect light does not refer to streak. Streak is the color of the powder left by a mineral when it is scraped across a rough surface. The ability of a mineral to reflect light is usually related to its luster, which describes how light interacts with the mineral's surface.
Any smooth surface will reflect light. The better question is "How much light does each kind of smooth surface reflect?"
The ability of a mineral to reflect light is known as its luster. Luster is categorized as metallic or non-metallic based on how light interacts with the mineral's surface. Minerals with metallic luster reflect light like metal, while non-metallic luster can range from glassy to dull.
No mineral inherently absorbs all light, but some, like coal and obsidian, appear dark because they absorb most light rather than reflect it. Minerals like pyrite and quartz are examples of minerals that reflect light due to their metallic or glassy luster.
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luster
A mineral surface reflects light based on its specific physical properties, such as its hardness, luster, and cleavage. The atomic structure and composition of the mineral determine how light interacts with its surface, affecting the intensity of reflection and the color perceived by the observer. Minerals with a higher luster or smoother surface tend to reflect light more brightly, while those with a dull or rough surface may scatter light in various directions.
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Because it has a shiny & smooth surface which helps to reflect the light... Take an example of tree. A tree have a rough surface due to which light can be reflect. So All of this depends on the smoothness of surface.. :-)
Light rays reflect in many directions on a rough surface due to the uneven nature of the surface, which causes the rays to scatter in various directions rather than reflect uniformly as with a smooth surface.
Reflect