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Azurite
https://australian.museum/learn/minerals/mineral-factsheets/azurite/These large, golden tetrahedral chalcopyrite (copper iron sulphide) crystals on quartz matrix were purchased in the mid-1960s by Albert Chapman from John Cerlienco of South Australia.
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Beryl (aquamarine)
https://australian.museum/learn/minerals/mineral-factsheets/beryl-aquamarine/Sapphire (aluminium oxide) can be many colours, but the beautiful blue we see most often is from traces of iron and titanium.
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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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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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Sardonyx dish and stand
https://australian.museum/learn/minerals/mineral-factsheets/sardonyx/Sardonyx is a variety of chalcedony (silicon dioxide) with alternating brown to red and white to yellow bands.
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Wulfenite with Mimetite
https://australian.museum/learn/minerals/mineral-factsheets/wulfenite/Wulfenite (lead molybdate) displays some of the most vibrant colours in the mineral world, from honey-yellow, orange and red to olive green.
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Topaz
https://australian.museum/learn/minerals/mineral-factsheets/topaz-brazil/This huge, clear topaz crystal weighing 5.5 kg has a perfect and sharp crystal shape (orthorhombic crystal system) with a diamond-shaped cross-section.
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Jasperised wood
https://australian.museum/learn/minerals/mineral-factsheets/jasperised-wood/This polished, richly hued slice of jasperised wood is from the Petrified Forest National Park, which covers parts of Navajo and Apache Counties in north- eastern Arizona, USA.
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Manganite
https://australian.museum/learn/minerals/mineral-factsheets/manganite/Germany has produced some of the largest and best manganite (manganese hydroxide) crystals in the world, as shown by this superb example.
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Celestine
https://australian.museum/learn/minerals/mineral-factsheets/celestine/This large hollow geode lined with sky blue celestine crystals was purchased from a Victorian mineral dealer.
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