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Gem deposits
https://australianmuseum.net.au/learn/minerals/gemstones/gem-deposits/Gem deposits are a very important group of mineral deposits, forming in a variety of geological environments and occurring in rocks of all ages from thousands of millions to recent times.
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Fluorite
https://australianmuseum.net.au/learn/minerals/gemstones/fluorite/Facts about Fluorite.
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Nephrite jade
https://australianmuseum.net.au/learn/minerals/gemstones/nephrite-jade/Facts about Nephrite jade.
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Opal
https://australianmuseum.net.au/learn/minerals/gemstones/opal/Facts about Opal.
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Sapphire and Ruby
https://australianmuseum.net.au/learn/minerals/gemstones/sapphire-and-ruby/Facts about Sapphire and Ruby.
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Garnet
https://australianmuseum.net.au/learn/minerals/gemstones/garnet/Facts about Garnet
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Peridot
https://australianmuseum.net.au/learn/minerals/gemstones/peridot/Facts about Peridot.
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Topaz
https://australianmuseum.net.au/learn/minerals/gemstones/topaz/Facts about Topaz.
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Zircon
https://australianmuseum.net.au/learn/minerals/gemstones/zircon/Facts about Zircon
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Crystallography
https://australianmuseum.net.au/learn/minerals/what-are-minerals/crystallography/Minerals can be identified by the shape of their crystals: called crystallography. External crystallography measures the outside properties of crystals such as length of crystal surfaces and the angles between these surfaces.