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A diamond is a crystalline mineral form of the element carbon. Igneous, metamorphic, and sedimentary are descriptive terms used to classify types of rocks, not minerals such as diamond.

Diamond is accepted as a valid mineral by the International Mineralogy Association.

Diamonds are found in igneous rock which is brought to the surface of the earth by volcanic eruptions bringing magma to the surface. Diamond itself is strictly an allotrope of the element carbon, a mineral, one form of crystal that can be created from carbon.

However, the diamond itself is a metamorphicmineral, as it forms under heat and pressure from solid-state processes. It forms independently of the igneous rock in which it is found, qualifying it as a type of xenocryst.

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What kind of rock is pegmatite is it sedimentary igneous or metamorphic?

Pegmatite is an igneous rock that forms in the final stage of magma crystallization. It typically contains large crystals due to the slow cooling of the magma.


What are the characteristics of the three types of rocks sedimentary metamorphic and igneous?

Sedimentary rocks: Rock formed when chemical reactions cement sediments (small, solid fragments of rocks and other materials) together, hardening them. Igneous rocks: Rock that forms from molten rock (hot magma thats cools and hardens). Metamorphic rocks: Igneous/sedimentary rock that has been changed into a new kind of rock as a result of great pressure and temperature.


How do igneous sedimentary and metamorphic rocks form?

If any kind of rock-igneous or sedimentary- is far enough beneath the surface, the pressure can change it into a metamorphic rock. Also heat - the effects differ. It doesn't have to be ever so deeply buried, geologically, since metamorphism is usually a orogenic process in the affected sedimentary rock.


How can an igneous or metamorphic rock change into a sedimentary rock?

A sedimentary rock can change from that to a metamorphic rock then into an Igneous rock. e.g. Mudstone (sedimentary) is in the Zone of Diagenesis, when it is subjected to regional metamorphism (in mountain belts) it changes from a mudstone to a slate (low grade) then to a Phillite (medium grade) then a Schist (medium) then a gneiss (high grade) then into a Milonite (high grade) then once past the line of partial melting it has so much pressure and so much temperature that it turns into an Igneos rock. This is the basic explanation of this. If you want to know more, just ask me.Sedimentary rocks are changed into metamorphic by being buried deep enough that the heat and pressure alter their text, mineralogy, or other characteristics.


What types of rocks contain fossils?

Igneous rocks and most metamorphic rocks, of an igneous origin.