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The pale blue color of aquamarine is attributed to Fe 2+. Fe 3+ ions produce golden-yellow color, and when both Fe 2+ and Fe 3+ are present, the color is a darker blue as in maxixe. [ 22 ] [ 23 ] Decoloration of maxixe by light or heat thus may be due to the charge transfer between Fe 3+ and Fe 2+ .
Peridot is one of the few gemstones that occur in only one color: an olive-green. The intensity and tint of the green, however, depends on the percentage of iron in the crystal structure, so the color of individual peridot gems can vary from yellow, to olive, to brownish-green. In rare cases, peridot may have a medium-dark toned, pure green ...
It is usually colourless, like quartz, but can also be either pale yellow [5] or yellowish-brown. It typically occurs in contact metamorphic rocks . The Dana classification of minerals categorizes danburite as a sorosilicate , while the Strunz classification scheme lists it as a tectosilicate ; [ 4 ] its structure can be interpreted as either.
Main chrysoberyl producing countries. The mineral or gemstone chrysoberyl is an aluminate of beryllium with the formula Be Al 2 O 4. [5] [6] The name chrysoberyl is derived from the Greek words χρυσός chrysos and βήρυλλος beryllos, meaning "a gold-white spar".
This is a list of gemstones, organized by species and types. Minerals. There are over 300 types of minerals that have been used as gemstones. Such as: A–B
American Golden Topaz, the largest cut yellow topaz, weighing nearly 23,000 carats (4.6 kg). Chalmers Topaz , a 5,899.5-carat (1.17990 kg) cut topaz. Tsavorite
The State of Minas Gerais is the largest producer and exporter of gemstones in Brazil and is accountable for 74 percent of the official production which includes brazilianite. [15] It is soft and fragile causing it not to be a popular stone. [7] When brazilianite is heated, it loses it yellow color and becomes colorless. [11]
On fresh surfaces, it is pale yellow to almost white and has a bright metallic luster. It tarnishes to a yellowish or brownish color and gives a black streak. It is a brittle material that cannot be scratched with a knife. The thin, flat, tabular crystals, when joined in groups, are called "cockscombs".
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