Quartz

Quartz is one of the most common minerals found in the earth’s crust. In fact, Quartz is by far the most common mineral of beach, desert and other sands throughout the world, clearly demonstrating the abundance of this well-known mineral. Quartz is also one of the most varied of all minerals, occurring in numerous forms, crystal habits and colors, which makes it extremely popular among mineral collectors. Quartz crystals, which can vary greatly in crystal form and size, are generally a hexagonal (six-sided) prism (all sides parallel) with a pyramidal (six-sided pyramid) termination. In its purest form, Quartz is clear, transparent and glass-like, but due to various inclusions, Quartz can be found in a wide variety of colors, the most common including colorless (rock crystal), white (milky), purple (amethyst), brown to black (smoky), pink (rose), yellow (citrine) and red (tangerine or, how about just red – why not?).
Almost all varieties and colors of Quartz can be found in the jewelry industry as semi-precious gemstones. Quartz gemstones are affordable and durable, having a hardness of 7 on the Mohs hardness scale.
Quartz is found throughout the world; notable localities that produce fine quartz specimens include Brazil, the USA (Arkansas), Madagascar, Mexico, Morocco, China, Namibia and Pakistan.