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https://www.gemsociety.org/gemstone-encyclopedia/
Bytownite is found in basic plutonic rocks, some metamorphic rocks, and meteorites. Calcareous Concretions View Profile Several species of marine mollusks produce stony growths called calcareous concretions or non-nacreous pearls. Varieties such as conch pearls, tridacna pearls, and others are frequently used in jewelry.
http://ikonet.com/en/visualdictionary/static/us/minerals_precious_stones
Most of them combine to form rocks, like the quartz, feldspar, and mica found in granite. The rarest and most beautiful may be turned into jewelry. This family of minerals, called gems, groups together some 50 different semiprecious stones, including agate, opal, and jade, and four precious stones.
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