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Opal is neither a sedimentary, igneous, nor metamorphic rock. It is actually a mineraloid composed of hydrated silica that is formed from silica-rich solutions at low temperature, often found in sedimentary rocks like sandstone or volcanic areas.

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Q: Is opal a sedimentary igneous and metamorphic rock?
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Continue Learning about Earth Science

Is graphite igneous sedimentary or metamorphic?

Graphite is a metamorphic rock. It is formed from the metamorphism of organic sedimentary rocks, such as coal, under high temperature and pressure.


Does a rock go through the complete rock cycle by changing from igneous rock to sedimentary to metamorphic?

Yes, a rock can go through the complete rock cycle by starting as an igneous rock, then transforming into sedimentary rock through weathering and erosion, and finally becoming metamorphic rock through heat and pressure. This cycle can repeat due to Earth's constant processes.


Is breccia a sedimentary metamorphic or igneous rock?

Yes. In the rock cycle, any sedimentary rock can be transformed into a metamorphic rock due to deep burial where the rock is changed by the earth's high temperature and pressure, an exposure to a plutonic intrusion, where rocks such as granite are formed, or any other process where heat and pressure alter the composition, appearance, and classification of a rock. An igneous rock can turn into a metamorphic rock or a sedimentary rock. A metamorphic rock can turn into an igneous rock or a sedimentary rock, and a sedimentary rock can turn into an igneous rock or a metamorphic rock.


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The three main types of rocks are igneous, formed from cooling lava or magma; sedimentary, formed from compressed layers of sediment; and metamorphic, formed from existing rocks that undergo high heat and pressure.


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The rock inside the Kaaba is a black meteorite, known as the Black Stone (Hajar al-Aswad), which is believed to be of meteoric origin. It is not a sedimentary, igneous, or metamorphic rock.