Cloud Crystal Quartz is smooth and round shaped with beautiful cloudy white over a translucent gray colored surface. Quartz is a silicon dioxide, and the most common mineral in the Earth’s crust. Transparent quartz has a macrocrystalline structure, meaning crystals and grains are visible to the eye. When in its purest and clearest form, Quartz is known as Rock Crystal. Quartz can be heat-treated and enhanced to create vibrant and extra-shiny beads!