Properties
There are types of garnet in many colors including red, orange, yellow, green, blue, purple, brown, black and pink color. This is the rarest onyx blue, discovered in the late 1990s in Bekily and Madagascar. Were also found in parts of the United States, Russia and Turkey. Color changes from green and blue in daylight to purple in bright light, as a result of relatively high amounts of vanadium (about 1 wt. V2O3%). Other varieties of garnet color changing exist. In broad daylight, the color ranges between shades of green, beige, brown, gray, and blue, but in bright light, they appear to reddish or purple / pink. Because of the color changing quality, this type of garnet is often mistaken for alexandrite. Found in the garnet mine Sapphire Spokane near Helena, Montana
There are types of garnet in many colors including red, orange, yellow, green, blue, purple, brown, black and pink color. This is the rarest onyx blue, discovered in the late 1990s in Bekily and Madagascar. Were also found in parts of the United States, Russia and Turkey. Color changes from green and blue in daylight to purple in bright light, as a result of relatively high amounts of vanadium (about 1 wt. V2O3%). Other varieties of garnet color changing exist. In broad daylight, the color ranges between shades of green, beige, brown, gray, and blue, but in bright light, they appear to reddish or purple / pink. Because of the color changing quality, this type of garnet is often mistaken for alexandrite. Found in the garnet mine Sapphire Spokane near Helena, Montana
Characteristics of species can be garnet in the light transmission of a set of samples for transparent gemstone quality varieties vague used for industrial purposes and abrasives. Metallic luster and is classified as a glass (like glass) or resinous (amber, such as). Crystal structure Molecular model of garnet.
Garnet and nesosilicates have a general formula X3Y2 (SiO4) 3. Site X is usually occupied by divalent cations (CA2 +, + Mg2, FE2 +) and the location of any of trivalent cations (+ AL3, + FE3, + Cr3) in the framework / octahedral with tetrahedral [SiO4] 4 - the occupation of Tetrahedra . [2] agate is often found in dodecahedral crystal habit, but here there are also usually in the habit trapezohedron. Called (Note: the word "trapezohedron" as used here and in most of the texts refers to the formation of mineral icositetrahedron Deltoidal in engineering solid.), Which crystallized in the cubic system, and after all three axes of equal length and perpendicular to each other. Garnet does not show cleavage, so when they break under pressure, and irregular pieces are sharp. hardness
Because the chemical composition of garnet varies, atomic bonds in some species are stronger than others. As a result, this group shows a group of mineral hardness scale Moss of about 6.5 to 7.5. The most difficult species, such as almandine, and is often used for abrasive. Species Group endmember garnet Garnet Pyralspite aluminum in the Al-site -
* Almandine: Fe3Al2 (SiO4) (3)
* Pyrope: Mg3Al2 (SiO4) (3)
* Spessartine: Mn3Al2 (SiO4) (3)
Almandine Almandine in Metamorphic Rocks
Almandine, and sometimes incorrectly called almandite, is a modern gem known as carbuncle (though originally was known in almost any red gemstone that name). Derived the term "carbuncle" from Latin meaning "anthrax" or burning coal. Almandine and the name is a corruption Alabanda, a region in Asia Minor, where the cut of these stones in ancient times. Chemically, almandine garnet is the iron and aluminum with Fe3Al2 formula (SiO4) (3), and deep red transparent stones are often called precious garnet and precious stones are also used (which are the most common cause of Agate GEM). Almandine occurs in metamorphic rocks like a rock of mica, associated with minerals such as staurolite, kyanite, andalusite, and others. Almandine and aliases of the East Garnet, Ruby almandine, and carbuncle. Pyrope
Pyrope (pyrōpós from Greek means "fire eyes") is red in color and chemically with the magnesium aluminum silicate Mg3Al2 formula (SiO4) (3), although it could be replaced by magnesium in a part of iron, calcium and iron. The color of pyrope varies from red to black almost profound. Used pyropes transparent and precious stones.
A variety of pyrope from Macon County, North Carolina is a violet shadow, red garnet and it was called, from the Greek meaning "rose." In the chemical composition and can be considered the basis for the combination of isomorphous pyrope and almandine, in relation to the two parts pyrope almandine part one. Pyrope, trade names and some misnomers; Cape Ruby, Ruby, Arizona, California ruby, Rocky Mountain ruby, and Bohemian garnet from the Czech Republic. Another intriguing finding Agate Blue is the color change from Madagascar, and the combination spessartine pyrope. Color Agate Blue This is not like sapphire blue in the middle of the day, but little more subdued gray-green blues and blues sometimes seen in spinel. However, in light of the LED color white is equal to the best Cornflower blue sapphire or D block tanzanite, this is due to the ability of an onyx blue component to absorb the yellow light emitted.
Pyrope is an indication of the rock and metal high pressure. And garnet from mantle derived rocks, and peridotites eclogites, commonly contain a variety of pyrope. Spessartine Spessartine (reddish metal)
Spessartine spessartite or manganese, aluminum, garnet, Mn3Al2 (SiO4) 3. Its name is derived from Spessart in Bavaria. This occurs most often in the pegmatite granite and rock types and allied with them in the phyllites a certain degree of low temperatures. Was found Spessartine of yellow and orange in Madagascar. Was found spessartines violet red rhyolites in Colorado and Maine.
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