lava
An igneous rock with very small mineral crystals most likely formed from a rapid cooling process. This rapid cooling prevents the minerals from growing larger, resulting in the fine-grained texture characteristic of rocks like basalt or rhyolite.
welded tuff is a igneous rock so it is more likely for it to have the same minerals as most other igneous rocks.
It is most likely formed underground.
It is likely to have a coarse-grained texture.
yes
It is most likely extrusive.
welded tuff is a igneous rock so it is more likely for it to have the same minerals as most other igneous rocks.
It is most likely formed underground.
Gemstones do not form in soils.
Igneous
Plagioclase.
Quartz is more likely to form well-shaped crystals in igneous rocks due to its high viscosity and slow cooling rate, allowing for the growth of distinct crystal faces and shapes. Plagioclase, on the other hand, often forms more irregular or blocky crystals due to its lower viscosity and faster cooling rate.
Rocks that feel and look the same likely share similar mineral composition and texture. Minerals present in the rock, as well as the way the rock formed (igneous, sedimentary, metamorphic), contribute to its appearance and feel. Thus, rocks that appear and feel the same are likely to be composed of similar minerals and have undergone similar geological processes.
This is likely a pegmatite, which is a type of igneous rock known for its exceptionally large crystals. Pegmatites can contain minerals such as quartz, feldspar, and mica that have grown to substantial sizes due to the slow cooling and high concentrations of elements in the magma from which they formed. These minerals are often sought after by collectors for their impressive size and clarity.
d. on the surface of the Earth
It is likely to have a coarse-grained texture.
The rock is likely a type of sedimentary rock that forms through the deposition and compaction of sediments, such as sandstone or shale. The minerals in each layer may vary based on the composition of the original sediments and the processes that led to their formation. The distinct layers can provide information about the environment in which the rock was formed.
you would normally find igneous rock which is formed by cooled magma.