The cooling rate of the rock.
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You say it as ' Igneous ROCK ' and ask whether it is a rock..
No, it is a mineral.
An* And no. Cinnabar is a mineral, not a rock.
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.
The size of the mineral crystals in an igneous rock determines the rock's texture.
Gabbro.
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The mineral composition of the conglomerate determines the grain shape as well the the type of weathering or erosive elements (wind, water, chemicals) that the rock is is exposed to because grain shape is heavily dependent upon whether the rock has been subjected to erosion or not.
You say it as ' Igneous ROCK ' and ask whether it is a rock..
Quartz is a rock-forming mineral--and can be found in all three rock types. There is no igneous rock formation that is exclusively composed of the mineral quartz.
Pumice is an extrusive igneous rock, not a mineral.
No, it is a mineral.
An* And no. Cinnabar is a mineral, not a rock.
Cobalt is a mineral, not a rock.
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.
the rate the melted rock cools