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Garnet – Garnet is a group of silicate minerals classified into two categories based on their secondary element being either Aluminum or Calcium. Garnets, though often red, can be found in any color. It was believed until recently that a blue variety of Garnet did not exist. Currently, the presence of blue Garnet is only in color changing Garnets, which only display the blue coloration in natural or fluorescent light. As the birthstone for January, this colorful gemstone has solidified its spot for popularity among many.
Gaspeite – An extremely rare nickel carbonate mineral. Gaspeite can be a pale to light grass green or a bright lime to apple green. Its name comes from the Gaspe’ Peninsula in Canada, where the stone was first described in 1966, and can it can also be found in Western Australia. Gaspeite is considered a semi-precious stone. Used commonly in Native American style jewelry, this green stone often displays a brown toned patterning.
Gem Silica – Gem Silica is a type of Chalcedony (Quartz) this displays vivid blue green colors due to Copper salts. Sometimes called Chrysocolla Chalcedony, because of its coloring and the fact that Chrysocolla also has Copper salt inclusions, this mineral is not actually a Chrysocolla. Gem Silica is quite rare and found only in Arizona, New Mexico, Taiwan and the Philippines.
Geode – Volcanic or sedimentary rocks that are hollow with tiny fissues for fractures that have allows mineral rich water to seep inside are known as geodes. These formations occur as crystals and can be agate, jasper, chalcedony or other mineral varieties.
Glendonite – Glendonites are a star shaped crystal that get their name from their location, Glendon, NSW, Australia. These cream to brown Ikaite calcite psuedomorphs occur as Ikaite integrates water and crystallizes, which can only happen in cold climates with ground movement or climate changes. For this reason, Gledonite offers historical information regarding climates and are of great help to climatologists. Other forms of this psuedomorphs have different names based on their localities
Gobi Desert Jasper – Gobi Desert Jasper is a mineral that forms in the Gobi Desert of Asia. These ventifacts are created by windblown sand eroding the surface of the stones, creating a highly polished, wavelike facet patterning.
Goethite in Quartz – Goethite is an oxide mineral named after a German polymath. This iron bearing formation can be yellowish, reddish, brown or even almost black in hue. Having been used for pigment since prehistoric time, Goethite can be seen commonly today used as an iron ore. Goethite is readily found throughout the planet in all formations, including needle like crystals and masses, stalactites, oolites and botryoidal structures.
Golden Beryl – The golden variety of Beryl, Heliodor, gets its name from the Greek word for “gift from the sun” because it has a vivid golden hue. The coloration of this Beryl is created when iron replaced aluminum within the hexagonal crystal structure. This stone was first discovered in 1910 in Namibia, though it can be found in a handful of localities around the world.
Golden Labradorite – Golden labradorite is a silicate mineral (feldspar) variety of golden yellow hue. It can be opaque or translucent.
Goldenite – Goldenite is a natural black hornblende with patterned gold pating.
Green Amethyst – Green Quartz is often called Green Amethyst, though its proper name is Prasiolite. Almost all Prasiolite since 1950 has come from Brazil, but this quartz has also been found in Poland and Canada recently. Prasiolite is a rare natural stone, and is created of heated Amethyst by natural geological events. It can also be made in a lab, as well as Citrine, which is also heated Amethyst.
Garnet Tsavorite – The green variety of the grossular species in Garnet is known as Tsavorite, a name coined by Tiffany and Co. in the 1970s based on its discovery location in the Tsavo National Forest bordering Tanzania and Kenya. Only discovered in 1967, this gemmy green crystal gets its coloring, which can range between a bright yellow green to a rich deep moss green, from vanadium and chromium impurities within the Garnet. Tsavorite, while a spectacular gemstone, is rarely found in crystals over 1 carat in size, making them quite rare and unique.
Gold Citrine – The slightly green to golden hue of citrine is known as green gold citrine.
Green Kyanite – Kyanite is a blue silicate mineral. These crystals are seen most often in a deep, almost denim blue hue, though other color variations can be found, including Green. Green Kyanite is very rare. All Kyanite is brittle; making it very difficult to cut faceted stones from, and is often seen as a collectors or display piece or in a raw crystal form in jewelry pieces.
Green Turquoise – Turquoise can be treated to display a brighter color hue than it occurs naturally. Generally, the treatment is for the purpose of stabilization with added blue tones that enhance the natural turquoise, though it is also seen treated with vibrant green hues. Natural green turquoise can exist as a completely untreated turquoise oxidizes and changes color to display varying shades of green that are generally an olive or mint hue that look quite different than the treated bright green turquoise.