Question

As part of matter in our surroundings, I have a doubt.
I have a stone in my house which glows a green colour in the dark after being exposed to sunlight for some time. Can u please tell me what mineral it can be and why does it glow like that?

Answer 1

Glowing in the dark — also known as luminescence — simply requires chemicals that store energy when exposed to light. These special substances are called phosphors. This type of glowing is sometimes called phosphorescence.

Phosphors radiate visible light after being energized. This means you have to expose the items to light for a while before they will glow in the dark.

Phosphors then slowly release their stored energy over time. As they release the energy, they emit small amounts of light, which we see as an object glowing.