Of the three principal rock types (igneous, sedimentary, and metamorphic), igneous rocks can be thought of as "primary" rocks because they crystallize from a liquid. Sedimentary and metamorphic rocks, ...

The magma cools down and solidifies, leaving behind a mound of rock, like Traprain Law. Igneous intrusions can be found all around Scotland, not just in Edinburgh and Lothian. Some other examples ...

An igneous rock has come to be regarded, more constantly than before, not merely as a mineral-aggregate, but as-the product of consolidation of a molten rock-magma; and consideration has been ...

The rock was excavated from the Bushveld Igneous Complex in South Africa, an area known for its rich ore deposits. This is the oldest example of living microbes being found within ancient rock so ...

Therefore, igneous rocks are made from solidified magma and lava from the earth’s volcanic activities. Here are fascinating facts about these types of rocks. Photo by Dr. Juliet Ugbede Akoh: An ...

Abstract: In this paper we classify the range of feldspathic igneous rocks using five geochemical variables: the FeO/(FeO + MgO) ratio or Fe-index, the modified alkali–lime index, the ...