Gemstones in the Quartz Group - Noble But Affordable

Quartz and related minerals are very common in rocks on earth. Pieces of quartz minerals with gemstone quality are also fairly common and are therefore sold for an affordable prize. In spite of the commonly law prize, these noble stones possess a unique beauty with a calming result on the mind not found in other noble stones due to the color tunes, the color variation, the luster or the clarity that these minerals show. These gemstones therefore deserve a place in any jewelry collection, regardless of the thrifty strength of the owner.

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Quartz is composed generally of the elements silicone and oxygen, and have the chemical formula SiO2. Pure quartz is colorless, but foreign elements can give any inherent color or color pattern to a piece of a quartz mineral.

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Minerals in this group can show up as 6-sided transparent crystal prisms, as penetrative lumps of small corny crystals, as penetrative masses composed of diminutive crystals, and as amorphous glasses with changeable transparency. Crystalline quartz minerals are fairly hard, of grade 7, while grade 10 is the hardest grade possible.

Gemstones in the Quartz Group - Noble But Affordable

These are the most leading gemstone minerals in the quartz group:

Ordinary grainy quartz: This form of quartz consists of myriads of small, but still graphic crystals lumped together, giving large pieces of a grainy appearance. This form of quartz is translucent, but not transparent. It is often white, and it is then often mistaken for marble. This variant is most often just called quartz. It can also be brown, and is then called smoke quartz. A purple or violet variant is called rose quartz.

Aventurine: This is a stone mostly composed of grainy quartz. In expanding there are small flat grains of other minerals with a metallic shimmer, for example the crom-compound fuchsite, giving the whole stone a metallic green or blue shine. The basic color of aventurine is most often green, but it can also be orange, brown, yellow or gray.

Grainy quartz can be used both as jewels in adorns and to form larger artworks.

Rock crystal: This is big and clear crystals of quartz. They are fine to form with facets like a diamond. A cut rock crystal has a unique clear transparency and a wonderful luster.

Citrine: Citrine is big and transparent crystals of quartz with red, yellowish or brown colour, often due to dissolved iron. Big brown quartz crystals are also often called smoke quartz.

Amethyst: Amethyst is quartz with big crystals with a unique gorgeous violet color not found in any other gemstone.

Rock crystal and the related variants like amethyst are commonly used in adorns where one crystal forms one jewel.

Calcedon: A piece of calcedon consists of a myriad of diminutive crystals. Calcedon is penetrative and of a uniform greyish or grey-blue color and show a calm silky luster. Calcedon is formed inside cavities by gradual crystallization from a watery solution. The town of the specimen is often still hollow, and the innermost layer often consists of rock crystal.

Agate: Agate is often considered a variant of calcedon. A complete agate specimen consists of complicated layers of diminutive crystals, one layer inside the other. A piece of agate is translucent, but not transparent. The layers give a gorgeous pattern of bands of assorted colors when a specimen is cut through. All colors can be present, but most common are shades of brown, red-brown, blue-brown, blue and white. An agate is formed inside cavities by gradual crystallization from a watery clarification one layer inside the other. The town of the specimen is often still hollow as in calcedon, and the innermost layer often consists of rock crystal or amethyst.

Onyx: An onyx specimen consists like agate of multicrystaline layers with separate colors, but in onyx these are stacked upon each other. Unlike in agate, green is a very common color.

Carneol: Also a carneol specimen consist of diminutive crystals. Carneol is deep red and nearly not penetrative at all.

Specimens of calcedon, agate onyx and carneol can be rather big. These stones can therefore be used both as jewels in adorns and to make larger artworks of a peculiar beauty.

Opal: Opal is physically a sort of glass with diminutive water drops blended into its structure. The water causes a diffraction and interference of the light falling onto it that make the opal show a involved silky color play. As opal is a rare stone, it is the most costly member of the quartz group.

Obsidian: Obsidian is a glass produced when magma erupted from volcanoes is cooling. Obsidian often contains small gas bubbles, soluted coloured substances or impurities. Obsidian can be transparent, penetrative or totally opaque. The color is mostly green, white or whitish, but sometimes so dark that it is nearly black.

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