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Is fluorite and intrusive rock or a extrusive rock?
selenite is a mineral
What igneous rock has crystals that are not visible?
Extrusive igneous rock consists of mineral crystals that are not observable with the naked eye. Obsidian is an extrusive igneous rock (volcanic glass) where there technically are no mineral crystals.
What material does extrusive rock form?
Extrusive rock forms from cooling lava.
Is a diamond an intrusive or extrusive igneous rock?
A diamond is a mineral not a rock but I guess it extrusive because it happens pretty close to the surface of a volcano.
What are two extrusive igneous rock that contain crystals?
Basalt and rhyolite both are extrusive igneous rock that contains mineral crystals. However, the mineral crystals are normally less than 1 mm in diameter, and are therefore not discernible without magnification.
Is a pumice rock a rock or a mineral?
Pumice is an extrusive igneous rock, not a mineral.
Is fluorite and intrusive rock or a extrusive rock?
selenite is a mineral
Is andesite a mineral?
No. Andesite is an extrusive igneous rock.
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.
What igneous rock has crystals that are not visible?
Extrusive igneous rock consists of mineral crystals that are not observable with the naked eye. Obsidian is an extrusive igneous rock (volcanic glass) where there technically are no mineral crystals.
Is obsidian intrusive or extrusive?
quartz itself, but you will find fragments of quartz of all sizes in both sedimentary and metamorphic rocks.
From what material does an extrusive rock form?
Extrusive rock forms from cooling lava.
What material does extrusive rock form?
Extrusive rock forms from cooling lava.
Is a diamond an intrusive or extrusive igneous rock?
A diamond is a mineral not a rock but I guess it extrusive because it happens pretty close to the surface of a volcano.
A rock that cools very quickly so that few or no mineral grains form is?
You can describe the rock by the process that allowed it to cool quickly: "Extrusive" or you can describe it by its texture: "aphanitic". An extrusive rock tends to be aphanitic = Rocks formed from lava flows tend to have small crystals.
From what material does extrusive rocks form?
Extrusive rock forms from cooling lava.
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.
