I like the rock labradorite because the colors the form
Usually clear white or gray in reflected light Labradorescent colors can include: blue, green, yellow, orange and red.
Some specimens of labradorite exhibit a schiller effect, which is a strong play of iridescent blue, green, red, orange, and yellow colors as shown in the photographs above and at right. Labradorite is so well known for these spectacular displays of color that the phenomenon is known as “labradorescence.” Specimens with the highest quality labradorescence are often selected for use as gemstones.
My opinion: Roberto Serrano Querejeta
Is a beautiful rock the colors the information.