HC Set: Large 5.25" 2.5lb Clear Quartz Cluster Sparkling Natural Druzy Crystals Geode Mineral Stone Spesimen - Brazil + One Polished Clear Quartz Cabochon (#2) You will receive exactly this Clear Quartz Cluster - 133mm x 118mm x 104mm / 5 1/4 x 4 5/8 x 4 1/8 Inches; 1120g / 39.5 oz / 2.5 lb (see photo, stand not included)! In additional, you will get one of the Clear Quartz Cabochon similar to the one in the listing, the size and the color of the cabochon may slightly vary as well due to the fact that all minerals are different. Approximately Size: 31mm x 21mm x 16mm / 1 1/4 x 13/16 x 5/8 Inches; Approximately Weight: 12-22gr / 0.4-0.8 oz. Quartz is one of the most well-known minerals on earth. It occurs in basically all mineral environments, and is the important constituent of many rocks. Quartz is also the most varied of all minerals, occurring in all different forms, habits, and colors. There are more variety names given to Quartz than any other mineral. Although the Feldspars as a group are more prevalent than Quartz, as an individual mineral Quartz is the most common mineral. Most mineral reference guides list Chalcedony as an individual mineral, but in reality it is a variety of Quartz. It is the microcrystalline form of Quartz, forming only occurs in microscopic, compacted crystals. Chemical Formula: SiO2; Color: Colorless, white, purple, pink, brown, and black.; Hardness: 7; Some forms of Quartz, especially the gemstone forms, have their color enhanced. Almost all forms of the yellow-brown variety Citrine are in fact heat treated. Much Amethyst is also heat treated to intensify color, and a green transparent form known as "Green Amethyst" or "Prasiolite" is formed by heat treating certain types of Amethyst. There is also a transparent sky blue form of Quartz crystals, as well as a wildly iridescent type that are synthetically colored by irradiation of gold. (The above information is provided solely for informational purpose. Kindly note that all stones are offered for decorative purposes only. Please, handle your stones with great care, do not grind or crumble them, do not dip or add them into your food or drink, do not use any parts of them in any elixirs, potions, lotions etc. Always make sure you wash your hands before and after working with your crystals.)