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Opal is not considered a rock but actually a mineraloid gel. It is deposited at relatively low temperatures. One of the characteristics if igneous rocks, sometimes called fire rocks, is that they are formed at high temperatures. Whether an igneous rock forms below ground, or on or near the surface, it's all about heat forming the rock. Opal cannot take its form under that kind of heat.
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Is apatite intrusive or extrusive?
Apatite is typically found as an accessory mineral in both intrusive and extrusive igneous rocks. It is more common in intrusive rocks like granite, but can also be found in extrusive rocks like basalt.
Is mica extrusive?
No. A mineral is not inherently extrusive or intrusive. Mica can be found in intrisive igneous rocks and in metamorphic rocks.
Is fluorite and intrusive rock or a extrusive rock?
Fluorite is a mineral, not a type of rock. It is commonly associated with extrusive igneous rocks like rhyolite and granite.
Is dunite intrusive or extrusive?
Dunite is an intrusive igneous rock that forms from the cooling and solidification of magma beneath the Earth's surface. It is primarily composed of olivine mineral and is typically found in plutonic environments.
Is dacite intrusive or extrusive?
Dacite can be both intrusive and extrusive. Intrusive dacite forms when magma solidifies beneath the Earth's surface, while extrusive dacite forms when lava erupts on the Earth's surface and cools quickly.
Is apatite intrusive or extrusive?
Apatite is typically found as an accessory mineral in both intrusive and extrusive igneous rocks. It is more common in intrusive rocks like granite, but can also be found in extrusive rocks like basalt.
Is hematite extrusive or intrusive?
Hematite is commonly found as a sedimentary mineral in deposits like banded iron formations. It is not typically associated with igneous rocks, so it is neither extrusive nor intrusive in the conventional sense.
Is mica extrusive?
No. A mineral is not inherently extrusive or intrusive. Mica can be found in intrisive igneous rocks and in metamorphic rocks.
Is peridot an intrusive or extrusive igneous rock?
Peridot is olivine, which is a mineral, not a rock. It is found in both intrusive and extrusive rocks.
Is feldspar extrusive or intrusive?
Feldspar can be found in both extrusive and intrusive igneous rocks. In extrusive rocks, feldspar forms when magma cools and solidifies quickly on the Earth's surface. In intrusive rocks, feldspar forms as magma cools and solidifies slowly beneath the Earth's surface.
Is fluorite and intrusive rock or a extrusive rock?
Fluorite is a mineral, not a type of rock. It is commonly associated with extrusive igneous rocks like rhyolite and granite.
Is magnetite extrusive or intrusive?
Extrusive and intrusive are terms that apply to a type or formative method of igneous rock. Magnetite is not igneous, nor is it a rock. Magnetite is a mineral, formed by the processes of crystallization.
Is dunite intrusive or extrusive?
Dunite is an intrusive igneous rock that forms from the cooling and solidification of magma beneath the Earth's surface. It is primarily composed of olivine mineral and is typically found in plutonic environments.
Are crystals intrusive or extrusive?
extrusive
Is Plutonic intrusive or extrusive?
Intrusive
Is plutonic intrusive extrusive?
Intrusive
Is dacite intrusive or extrusive?
Dacite can be both intrusive and extrusive. Intrusive dacite forms when magma solidifies beneath the Earth's surface, while extrusive dacite forms when lava erupts on the Earth's surface and cools quickly.
