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Identifying gemstones
https://australian.museum/learn/minerals/gemstones/identifying-gemstones/Cut gemstones possess all the physical properties of the mineral from which they are cut, although the crystal shape is no longer evident.
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Cutting gemstones
https://australian.museum/learn/minerals/gemstones/cutting-gemstones/Faceted gemstones reveal the inherent qualities of a mineral, such as colour (or lack of it), clarity, fire and brilliance, which might otherwise remain hidden.
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Geological origin of gemstones
https://australian.museum/learn/minerals/gemstones/geological-origin-of-gemstones/Gemstones are formed below the Earth's surface and can sometimes show traces of other minerals, called inclusions.
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Valuing gemstones
https://australian.museum/learn/minerals/gemstones/valuing-gemstones/Gemstones are valuable because they are a rare and desirable commodity. They also represent time and labour spent on cutting and presentation.
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Dioptase on calcite
https://australian.museum/learn/minerals/mineral-factsheets/dioptase-on-calcite/This specimen shows a group of well-shaped rhombohedral pearly white calcite crystals with a liberal scattering of sugary emerald-green dioptase crystals.
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Nephrite jade carving 'nurse with goats'
https://australian.museum/learn/minerals/mineral-factsheets/nephrite-jade-carving/Several mineral species are referred to as ‘jade’. However, ‘true jade’ or ‘precious jade’ is the mineral jadeite, a sodium alumino-silicate, formed under high pressure deep down in the Earth.
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Vanadinite on baryte
https://australian.museum/learn/minerals/mineral-factsheets/vanadinite-on-baryte/This specimen was purchased from Albert Chapman who bought it at the 1980 Tucson Gem and Mineral Show in the USA.
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Amethyst geode
https://australian.museum/learn/minerals/mineral-factsheets/amethyst-geode/Brazil contains some of the deepest purple amethyst and largest geodes ever found. This impressive amethyst-lined geode shows hundreds of glittering crystals.
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Pyrite
https://australian.museum/learn/minerals/mineral-factsheets/Pyrite/This fine specimen has large striated cubic crystals of pyrite (iron sulphide).
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Linarite
https://australian.museum/learn/minerals/mineral-factsheets/linarite/This is one of the best linarite specimens in existence. Its chemical composition is lead, copper hydroxy- sulphate.
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Ramses & the Gold of the Pharaohs
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Wansolmoana
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