A group of quartz, 1.663 carats

Technical details: Type: Quartz Weight: 1.663 carats Dimensions (mm): 5.24x5.10x3.42 (average) Shape: Heart Color: White Clarity: Eye-clean Transparency: Transparent Hardness: 7.0 Treatment: Untreated Origin: Unknown Certification: Certificate from Saudi Laboratory (MT) - website (www.mtgl.com.sa) Quartz is a crystalline solid mineral composed of silicon dioxide (SiO2), and it is the second most abundant stone in the Earth's crust after feldspar. Quartz is characterized by its high hardness and glassy luster, and it is resistant to chemical and physical factors. It forms at all temperature ranges and is commonly found in igneous, metamorphic, and sedimentary rocks. Quartz is known for its wide variety of colors and shapes, which are attributed to the presence of mineral impurities or trace elements in its structure, leading to different types such as: Clear Quartz, Amethyst, Citrine, Rose Quartz, Smoky Quartz, and Tiger's Eye, in addition to types like Calcite and Agate.