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Water and sedimentary transport
https://australian.museum/learn/minerals/shaping-earth/water-and-sedimentary-processes/Water plays a vital role in most sedimentary processes. Pure water itself has little effect on rocks. It is the dissolved gases in water, particularly carbon dioxide, that cause the chemical decay of minerals and mineral dissolution.
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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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Earthquakes and tsunamis
https://australian.museum/learn/news/blog/earthquakes-and-tsunamis/What causes earthquakes and why do tsunamis often follow a large earthquake?
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Wave Rock
https://australian.museum/learn/australia-over-time/evolving-landscape/wave-rock/Wave Rock is in the wheat belt region of Western Australia, 350 km south-east of Perth.
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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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Pyroclastic processes and materials
https://australian.museum/learn/dinosaurs/pyroclastic-processes-and-materials/Pyroclastic means 'fire broken' and is the term for rocks formed from fragments produced by volcanic explosions.
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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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Geological ore deposits
https://australian.museum/learn/minerals/geological-deposits/geological-ore-deposits/Geological ore deposits are of many different types and occur in all geological environments.
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Magma
https://australian.museum/learn/minerals/shaping-earth/magma/Magma is hot molten mobile rock. Igneous rocks form when magma cools and solidifies. Magmas come out of active volcanoes as lavas.
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Heulandite
https://australian.museum/learn/minerals/mineral-factsheets/Heulandite/This is an attractive group of lustrous, orange, diamond-shaped crystals arranged in radiating sheaves.
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