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Quinzite opal is a non-existent gemstone variety. The term appears to be a fabrication or misconception, as it does not occur in mineralogical literature, scientific databases, or gemological records. Common opal varieties include precious opal, fire opal, boulder opal, and common opal, each defined by their distinct optical and physical properties.
Opal, classified as a mineraloid, consists of hydrated silica (SiO2·nH2O) with a water content ranging from 3% to 21%. The play-of-color phenomenon in precious opal results from the diffraction of light through a regular arrangement of silica microspheres. Opals form in sedimentary rocks through the precipitation of silica from low-temperature solutions, typically in arid regions with seasonal rainfall.
Quinzite opal is typically a natural gemstone.
Common names for Quinzite opal include Pink Opal, Peruvian Pink Opal, and Andean Opal.
Quinzite opal, like other types of opal, has a relatively low hardness on the Mohs scale, typically ranging around 5.5 to 6.5. This makes it somewhat susceptible to scratching and requires careful handling and storage to avoid damage.
The refractive index of quinzite opal usually falls between 1.44 and 1.46, which is relatively low compared to many other gemstones. This contributes to its distinctive play of color.
Quinzite opal exhibits a vitreous to pearly luster, giving it a shiny and often iridescent appearance that is highly prized in jewelry.
Opal, including quinzite opal, typically does not display any cleavage, which is a directional breakage pattern. Instead, it tends to break irregularly.
Quinzite opal usually has a conchoidal fracture, creating smooth, curved surfaces when broken. This type of fracture is commonly seen in glass and other amorphous solids.
The specific gravity of quinzite opal generally ranges from about 2.1 to 2.3, which is considered low, indicating that the stone is relatively light for its size.
Opal, including quinzite opal, is an isotropic material, so it does not exhibit birefringence. It has a single refractive index.
While quinzite opal may not have the high dispersion seen in stones like diamond, it is renowned for its play of color or “”fire,”” which is caused by the diffraction of light passing through its silica structure.
Opal is amorphous, meaning it does not have a crystalline structure. Quinzite opal, therefore, does not belong to any crystal system.
Quinzite opal can display a range of colors, often showing vibrant play of color against a body color that can be white, grey, black, or other shades depending on the variety.
The transparency of quinzite opal can vary from opaque to translucent, with some high-quality stones being almost transparent.
Quinzite opal does not exhibit pleochroism due to its amorphous nature.
Some opals, including quinzite opal, may show fluorescence under ultraviolet light, typically displaying a greenish or white glow, though this can vary.
Opal has generally fair to good toughness, but care should be taken as it can be prone to cracking or “”crazing”” under extreme temperature changes or dehydration.
Quinzite opal is generally brittle, which corresponds with its amorphous structure and relatively low hardness.
As an isotropic material, quinzite opal does not have an optic sign associated with birefringent materials.
Quinzite opal does not typically display a characteristic absorption spectrum; its color play is due to light interference within its microstructure rather than absorption.
Opal is a hydrated form of silica (SiO2·nH2O). The water content can range from 3% to 21% by weight, but is usually between 6% and 10%.
While not as common as in other gemstones, some quinzite opals can exhibit chatoyancy or a cat’s eye effect if they have aligned fibrous inclusions.
Asterism, or the star effect, is rare in opals, but when present, it adds significant value and interest to the stone.
Iridescence is a defining characteristic of many opals, including quinzite opal, where it is seen as a play of color caused by the diffraction of light.
Quinzite opal is not magnetic.
Opals, including quinzite opal, are generally poor conductors of electricity.
Quinzite opal is not radioactive.
