Gemstones do not form in soils.
Igneous
It is most likely formed underground.
you would normally find igneous rock which is formed by cooled magma.
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.
igneous rocks usally form by cooled magma.
Igneous rocks can contain iron, but not all igneous rocks do. The presence of iron in an igneous rock depends on the composition of the magma from which the rock formed. Iron can be found in minerals such as magnetite, hematite, and pyroxene within certain igneous rocks.
Igneous.
Igneous rock
Basalt would most likely be found on the ocean floor, as it is a common igneous rock formed from the solidification of lava. Shale, granite, and marble are all less likely to be found on the ocean floor, as they are sedimentary and metamorphic rocks that are not typically formed in marine environments.
If you were to tunnel into the crust of the Earth, you would most likely find igneous rocks. These rocks are formed from the solidification of molten magma below the Earth's surface. Examples of igneous rocks include basalt, granite, and diorite.
It is most likely intrusive
When lava reaches the surface of the Earth through volcanoes or through great fissures the rocks that are formed from the lava cooling and hardening are called extrusive igneous rocks. Some of the more common types of extrusive igneous rocks are lava rocks, cinders, pumice, obsidian , and volcanic ash and dust