Chalcedony - Microcrystalline form of Quartz. Citrine - Yellow, orange, or brown variety of Quartz. Faden Quartz - Group of Quartz crystals with a white thread-like zone running through the interior, with the crystals having formed around the thread axis. Ferruginous Quartz - Quartz with an opaque red to brown Hematite coating or internal inclusion. Milky Quartz - White, translucent to opaque variety of Quartz.
Morion - Opaque form of black Quartz. Phantom Quartz - Quartz containing internal phantom growth s, or ghostlike layers within a crystal. Prase - Light to emerald green, transparent to translucent Quartz , with coloring caused from inclusions of green minerals, such as Actinolite , Hedenbergite , Chlorite , or Malachite.
Prasiolite - Prasiolite describes a light green Quartz artificially colored by heat treatment of certain types of Amethyst. Rainbow Quartz - Quartz synthetically colored with an iridescent layer formed from gold or other metals. Rock Crystal - Colorless, transparent variety of Quartz in large crystal form.
Rose Quartz - Pink variety of Quartz. Rutilated Quartz - Quartz with golden yellow, needle-like Rutile inclusion s. Scepter Quartz - Quartz crystal with a scepter like protrusion on the end of the crystal that is wider than the rest of the crystal. Smoky Quartz - Brown to black, "smoky" variety of Quartz. Star Quartz - Polished Quartz displaying asterism in the form of a six-rayed star.
Tourmalinated Quartz - Quartz with splintery Tourmaline inclusion s. Tridymite , Cristobalite , Stishovite , Coesite.
Quartz is an important mineral with numerous uses. Sand, which is composed of tiny Quartz pebbles, is the primary ingredient for the manufacture of glass. Transparent Rock Crystal has many electronic uses; it is used as oscillators in radios, watches, and pressure gauges, and in the study of optics.
Quartz is also used as an abrasive for sandblasting, grinding glass, and cutting soft stones. It is also essential in the computer industry, as the important silicon semiconductors are made from Quartz. In addition to all the practical uses, Quartz is essential to the gem trade. See the separate Quartz gemstone page.
Many varieties are faceted as gem s. Amethyst and Citrine are the most well-known gem varieties. Small colorless Quartz crystals are worn by some as pendants for good luck. Quartz is also a very popular among collectors. Certain collectors specialize their collection entirely on Quartz alone. Fine Quartz crystals can be found throughout the globe. The localities that have produced exceptional Quartz are very extensive, and it is difficult to present only a select list of localities that are among the best-known for this mineral.
Nevertheless, we have made an attempt, with the understanding that many important locations have been left out. Quartz occurs in virtually all mineral environment s, and may be associated with almost every mineral.
Feldspar s - Softer 6 , perfect cleavage. Calcite - Much softer 3. Have a question about Quartz? Amazon Supply Store. It is silicon dioxide SiO 2. It is the most abundant mineral found at Earth's surface, and its unique properties make it one of the most useful natural substances.
Quartz is the most abundant and widely distributed mineral found at Earth's surface. It is present and plentiful in all parts of the world. It forms at all temperatures. It is abundant in igneous , metamorphic , and sedimentary rocks. It is highly resistant to both mechanical and chemical weathering. This durability makes it the dominant mineral of mountaintops and the primary constituent of beach, river, and desert sand.
Quartz is ubiquitous, plentiful and durable. Minable deposits are found throughout the world. Rock crystal quartz: Transparent "rock crystal" quartz. This specimen shows the conchoidal fracture fracture that produces curved surfaces that is characteristic of the mineral. Specimen is about four inches ten centimeters across and is from Minas Gerais, Brazil. Amethyst quartz: Purple crystalline quartz is known as "amethyst.
This specimen is about four inches ten centimeters across and is from Guanajuato, Mexico. Flint: Flint is a variety of microcrystalline or cryptocrystalline quartz. It occurs as nodules and concretionary masses and less frequently as a layered deposit.
It breaks consistently with a conchoidal fracture and was one of the first materials used to make tools by early people. They used it to make cutting tools. After thousands of years, people continue to use it. It is presently used as the cutting edge in some of the finest surgical tools. This specimen is about four inches ten centimeters across and is from Dover Cliffs, England. Quartz flint arrowheads: One of the first uses of quartz, in the form of flint , was the production of sharp objects such as knife blades, scrapers, and projectile points such as the arrowheads shown above.
Quartz is one of the most useful natural materials. Its usefulness can be linked to its physical and chemical properties. It has a hardness of seven on the Mohs Scale which makes it very durable. It is chemically inert in contact with most substances. It has electrical properties and heat resistance that make it valuable in electronic products.
Its luster , color, and diaphaneity make it useful as a gemstone and also in the making of glass. These deposits have been identified and produced as sources of high-purity silica sand.
These sands are used in the glassmaking industry. Quartz sand is used in the production of container glass, flat plate glass, specialty glass, and fiberglass. Quartz is abundant in certain igneous rocks. It forms the clear to grey or even white lumpy blobs in granite and comprise most of silicate-rich or felsic igneous rocks.
It is absent or rare in more primitive basic or silica-poor igneous rocks such as basalt. Quartz is almost never present in meteorites. Metamorphic rocks contain abundant quartz especially those produced from granites, sandstones, or shales. In particular, coarser-grained metamorphic gneiss is marked by distinct bands of quartz and other minerals. Sandstones are almost pure quartz. Sedimentary rocks those formed by physical or chemical accumulation of preexisting fragments of minerals or sediments plus a few rocks formed by chemical precipitation are the most common in Indiana provide the largest quantity and greatest variability of quartz form.
Sandstone is composed of various sized grains of quartz derived from preexisting rocks and transported to ancient seas where grains were cemented together to form durable rocks. Quartz is present as very small size grains in siltstone and shale. Sizes and shapes of grains are important variables in sandstones. Natural quartz crystals have too many chemical impurities and physical flaws. As a result, a commercial process of manufacturing pure, flawless, electronics-grade quartz was developed.
About metric tons of cultured quartz is produced each year. A seed crystal is a small piece of carefully selected, non-electronics-grade quartz. The manufactured crystal grows on this seed crystal.
Quartz crystal is one of several minerals which are piezoelectric, meaning that when pressure is applied to quartz, a positive electrical charge is created at one end of the crystal and a negative electrical charge is created at the other.
0コメント