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Classification of sedimentary rocks
https://australianmuseum.net.au/learn/minerals/shaping-earth/classification-of-sedimentary-rocks/Sedimentary rocks are classified according to the predominant grain size present, as well as by their mineral content.
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Concretions, Thunder Eggs and Geodes
https://australianmuseum.net.au/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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Volcanic landforms
https://australianmuseum.net.au/learn/minerals/shaping-earth/volcanic-landforms/Each type of volcanic massif (structure) contains lavas, pyroclastic rocks and intrusions, but these differ in proportions and compositions.
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Magma
https://australianmuseum.net.au/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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Volcanic rocks
https://australianmuseum.net.au/learn/minerals/shaping-earth/volcanic-rocks/Volcanic rocks are divided into three main types: basaltic, volcaniclastic and pyroclastic.
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Tektites
https://australianmuseum.net.au/learn/minerals/shaping-earth/tektites/Tektites are small, pebble-like glassy objects of Earth material that have been melted by meteorite impact, splashed up into our atmosphere, and fallen to Earth again under gravity.
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Igneous intrusions
https://australianmuseum.net.au/learn/minerals/shaping-earth/igneous-intrusions/Molten magma can invade the Earth's upper layers and then solidify as igneous intrusions.
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Quartz
https://australianmuseum.net.au/learn/minerals/gemstones/quartz/Quartz is the most common mineral, present in a wide range of rocks and gemstones.
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Labradorite
https://australianmuseum.net.au/learn/minerals/gemstones/labradorite/Facts about Labradorite
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Rhodonite
https://australianmuseum.net.au/learn/minerals/gemstones/rhodonite/Facts about Rhodonite.