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Opal is a hydrated amorphous form of silica (SiO 2 · n H 2 O); its water content may range from 3% to 21% by weight, but is usually between 6% and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals. It is deposited at a relatively low temperature and may occur ...
Aquamarine, the birthstone for March. Diamond, the birthstone for April. Emerald, the birthstone for May. Pearl, one of three June birthstones. Moonstone, one of three June birthstones. Alexandrite, one of three June birthstones. Ruby, the birthstone for July. Peridot, the modern birthstone for August.
Are you a ruby, diamond, or emerald? Each month has its own birthstone with a special meaning. Here's a guide to each dazzling gem from January to December.
Sapphire is one of the two gem-varieties of corundum, the other being ruby (defined as corundum in a shade of red). Although blue is the best-known sapphire color, it occurs in other colors, including gray and black, and also can be colorless. A pinkish orange variety of sapphire is called padparadscha.
Peridot. Peridot (/ ˈpɛrɪˌdɒt, - ˌdoʊ / PERR-ih-dot, -doh), sometimes called chrysolite, is a yellow-green transparent variety of olivine. Peridot is one of the few gemstones that occur in only one color. Peridot can be found in mafic and ultramafic rocks occurring in lava and peridotite xenoliths of the mantle.
September birthstone. Sapphire is September's birthstone. This gem belongs to the corundum family. Corundum is inherently colorless, according to the International Gem Society. So, each stone's ...
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