A felsic extrusive igneous rock, such as rhyolite or obsidian.
The rock is likely a rhyolite, which is an extrusive igneous rock with a composition similar to granite but formed from rapidly cooling lava, resulting in smaller crystals. Rhyolite typically exhibits a fine-grained texture due to its quick cooling process at the Earth's surface.
It is most likely extrusive.
If a rock has large crystals, it is an intrusive rock. Intrusive rocks form underneath the Earth's surface. Magma cools slowly so it has time to form large crystals. An example is granite, where you can see the crystals with your naked eye. Rocks that have small crystals are extrusive rocks. Extrusive rocks are ones that form from lava (blasted out of a volcano) so they cool very quickly, not allowing large crystals to form. An example is obsidian, where you cannot visibly see the small crystals; it just looks like one black, glassy rock.
The igneous rock most likely described is granite, which is composed predominantly of mica (specifically muscovite or biotite), feldspar, and quartz. This rock type forms from the cooling and crystallization of molten magma deep within the Earth's crust.
Granite, when uplifted by the movement of tectonic plates, is more likely to become a mountain as it gets pushed up towards the Earth's surface. This process is a result of the immense pressure and forces exerted by the tectonic plates colliding or moving past each other.
A felsic extrusive igneous rock, such as rhyolite or obsidian.
The rock is likely a rhyolite, which is an extrusive igneous rock with a composition similar to granite but formed from rapidly cooling lava, resulting in smaller crystals. Rhyolite typically exhibits a fine-grained texture due to its quick cooling process at the Earth's surface.
Due to its high acidic and viscous nature, granite will most likely be intrusive, causing dykes that cut through bedding planes.
extrusive
A Mafic Extrusive Igneous Rock.
Most likely it was a loose chunk of granite that popped off, got under the pad and caused the scratch. It happens.
It is most likely extrusive.
If a rock has large crystals, it is an intrusive rock. Intrusive rocks form underneath the Earth's surface. Magma cools slowly so it has time to form large crystals. An example is granite, where you can see the crystals with your naked eye. Rocks that have small crystals are extrusive rocks. Extrusive rocks are ones that form from lava (blasted out of a volcano) so they cool very quickly, not allowing large crystals to form. An example is obsidian, where you cannot visibly see the small crystals; it just looks like one black, glassy rock.
heavy rain on sloped granite
The rock is likely granite. Granite is a common igneous rock found in continental crust that is light in color due to its high quartz and feldspar content. It forms from the slow cooling of molten magma beneath the Earth's surface.
The igneous rock most likely described is granite, which is composed predominantly of mica (specifically muscovite or biotite), feldspar, and quartz. This rock type forms from the cooling and crystallization of molten magma deep within the Earth's crust.
If you are climbing the mountain and it erupts, yes, most likely you will die. Unless you are bird-man and can fly.