These are generally referred to as geodes and oftentimes contain quartz.
an igneouus rock
Geode-Thestate is rich in this rare rock that sparkles with crystals when broken open.
in a cave
You will find Earth crystals the same place you will find Iron ore. Sometimes even in the rock.
Intrusive rock normally has visible crystals. Extrusive igneous rock has small crystals. A black extrusive igneous rock with small crystals could be basalt.
The Element Magnesium is an Igneous Rock. This meaning that it formed from cooling lava that may or may not have produced crystals. Magnesium would have formed these crystals.
Matrix
you would find igneous rocks with small crystals at the bottom of the volcano, this is because when the rocks crack. It brakes apart into igneous rocks
The size of the crystals is a function of the rate of cooling of the molten rock. The faster the molten rock cools, the smaller the crystals will be.
Most generally, an igneous rock with small crystals formed from the cooling of lava on the surface of the Earth would be classified as basalt.
NO the faster a rock cools the smaller the crystals are.
The rock with crystals inside in can be igneous rock, but no, idk about the minerals.