Labradorite Pebble Mini (One Stone). Labradorite is a feldspar mineral and is often a grayish color with hues of green, yellow and blue in it. There are almost always cracks in Labradorite. This is what causes it to change color and creates \"flashes\" of the gorgeous blue that you see through out nice labradorite pieces. The colors move as you move the stone.. Each pebble measures approx. 1.5\" - 2.5\".. Please Note: This listing is for one individual stone only.. Colours of stones may vary slightly as this is a natural product.