Polished K2 Jasper Cabochon - Choose your quantity! Uniqueness Guaranteed: Every item is one-of-a-kind, making them ideal for all projects or designs. Avg Size Range: (1 to 1.75 Inches Long) K2 jasper is actually not a jasper at all, but instead a granite-like combination of microcline and alkali feldspars with small dark spots of muscovite and biotite. Over time, hydrothermal processes underground opened voids within the rock that filled with copper carbonate, which crystallized into K2 jasper's distinctive blue azurite spots. Handmade items vary in size, shape, and color when selected randomly (the highest quality items are chosen first). They'll be as beautiful as those in the photos.