وصف
Quartz is the second most abundant mineral on Earth, second only to Feldspar. Quartz can appear in sedimentary, metamorphic and igneous rocks but is not classed as a rock but a silicate mineral. The structure of quartz is mostly made up of a skeleton of silicon-oxygen tetrahedra. The hardness level of quartz on the Mohs scale is 7 and it has a density of 2.65g/cm³.
Pure quartz is normally colorless or white. Coloured quartz normally includes rose quartz, amethyst, smoky quartz, milky quartz, and others.
Quartz normally forms crystals, and ideal crystal shape is a prism ending with pyramid shape at the end, though in nature it is rare to find this as crystals normally inter-grow, distorting the shape. Well-formed crystals may reach several meters in length and weigh hundreds of kilograms.
Pure quartz is normally colorless or white. Coloured quartz normally includes rose quartz, amethyst, smoky quartz, milky quartz, and others.
Quartz normally forms crystals, and ideal crystal shape is a prism ending with pyramid shape at the end, though in nature it is rare to find this as crystals normally inter-grow, distorting the shape. Well-formed crystals may reach several meters in length and weigh hundreds of kilograms.
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Quartz
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