If lava cools almost instantly the rocks that form are glassy with no individual crystals like obsidian.
Igneous rocks with crystals too small to be seen without a microscope are.
Made up of grains or crystals that are large enough to be seen without a microscope.
Made up of mineral grains or crystals that are too small to be seen without a microscope.
A texture of igneous rocks in which the crystals are too small for individual minerals to be distinguished without the aid of a microscope.
Fine grained igneous rock that forms when magma cools quickly at or near earth s surface fine grained igneous rocks with crystals too small to be seen without a microscope are.
They are given this name because the crystals that form within them are so small that they can be seen only with a microscope.
Forming outside on the surface of earth s crust the mineral crystals in obsidian are too small to see without a microscope.
Phaneritic coarse grained texture an igneous rock texture in which the crystals are roughly equal in size and large enough so the individual minerals can be identified without the aid of a microscope.
For example pele s hair is long extremely thin.
Made up of atleast two very different sized grains.
An igneous rock consisting mostly of crystals large enough to see without a hand lens 1 mm has a coarse grained or phaneritic texture.