Mineral Play of Color

TMart Science introduction to mineral identification. This video covers the properties of internal "play of color" or opalescence and Labradorescence/shiller that results from diffraction and refraction inside mineral samples.

[@theresabetaway7775]

I always thought of Australian Opal as a Mineraloid rather than a Mineral .

[@TMartScience]

You are correct in this assessment. For the nature of this video, I wanted to give an example of the property. Technically opal is non-crystalline so therefore not a mineral.