Lesson 8: Shining a Light on the Minerals

Geologists use three words to describe light that may or may not travel through the mineral. You will use these three words in your journal to describe the results of the next mineral test.

Opaque: no light goes through the mineral (a piece of cardboard is opaque)

Translucent: some light goes through (a piece of wax paper is translucent)

Transparent: all the light goes through that is shined at them (a piece of glass is transparent)