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New Information from Old Specimens
https://australian.museum/learn/collections/natural-science/mineralogy/mineralogy-collection-new-information-from-old-specimens/In many ways the future and relevance of museum collections often depend on their past. Some specimens remain in the collections for a long time, sometimes over 100 years before they prove vital for current research projects.
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Metamorphic processes
https://australian.museum/learn/minerals/shaping-earth/metamorphic-processes/Most minerals are only stable at particular temperatures and pressures, so changes in these result in the formation of new minerals.
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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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Man made minerals
https://australian.museum/learn/minerals/what-are-minerals/man-made-minerals/Over 200 minerals are identified as either directly or indirectly made by humans.
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The Sydney Basin
https://australian.museum/learn/minerals/shaping-earth/the-sydney-basin/The Sydney Basin is a major structural basin containing a thick Permian-Triassic (290 Ma - 200 Ma (million years old)) sedimentary sequence that is part of the much larger Sydney-Gunnedah-Bowen Basin.
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Types of metamorphism
https://australian.museum/learn/minerals/shaping-earth/types-of-metamorphism/There are several different types of metamorphism, including dynamic, contact, regional, and retrogressive metamorphism, that form and shape rocks.
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Lavas
https://australian.museum/learn/minerals/shaping-earth/lavas/One of the products of volcanic eruptions is lava. Lavas vary widely in composition depending upon their original source magma.
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Concretions, Thunder Eggs and Geodes
https://australian.museum/learn/minerals/shaping-earth/concretions-thunder-eggs-and-geodes/Concretions are compact, often rounded, accumulations of mineral matter that form inside sedimentary rocks such as shale and sandstone or in soil.
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Limestone caves
https://australian.museum/learn/minerals/shaping-earth/limestone-caves/Caves form in limestone (calcium carbonate), and occasionally in dolomite (calcium magnesium carbonate), when water containing dissolved carbon dioxide (carbonic acid) seeps into rock crevices and joints.
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Machu Picchu and the Golden Empires of Peru
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Future Now
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Burra
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Minerals
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