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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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Sapphire and Ruby
https://australian.museum/learn/minerals/gemstones/sapphire-and-ruby/Facts about Sapphire and Ruby.
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Pyromorphite
https://australian.museum/learn/minerals/mineral-factsheets/pyromorphite/Pyromorphite (lead chloro-phosphate) was a common mineral of the oxidised zone of the Broken Hill orebody, and exceptional specimens of various crystal forms and colours were found.
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Anglesite on Cerussite
https://australian.museum/learn/minerals/mineral-factsheets/Anglesite-on-cerussite/This reticulated cerussite (lead carbonate) has a sugar-like coating of anglesite (lead sulphate).
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Banded Iron Formation
https://australian.museum/learn/minerals/mineral-factsheets/banded-iron-formation/Weighing a whopping 437 kg, this spectacular specimen is part of the Archean Nimingarra Formation of Western Australia and illustrates a dramatic change in Earth’s past atmospheric conditions.
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Oxidised zone copper minerals
https://australian.museum/learn/minerals/mineral-factsheets/oxidised-zone-copper-minerals/This stunning polished slice of blue chrysocolla (copper silicate with water), green malachite (copper hydroxy-carbonate) and brown ironoxide- stained jasper (silicon dioxide) is from the DeGrussa Copper-Gold Mine in the Pilbara Block of Western Australia.
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Topaz
https://australian.museum/learn/minerals/mineral-factsheets/topaz/This is a ‘Rembrandt of the mineral world’ – one of the world’s finest mineral specimens.
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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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