What are the 4 classification of igneous rocks?

Igneous rocks can be divided into four categories based on their chemical composition: felsic, intermediate, mafic, and ultramafic. The diagram of Bowen’s reaction series (Figure 7.6) shows that differences in chemical composition correspond to differences in the types of minerals within an igneous rock.

What are the 2 classifications of igneous rocks?

Igneous rocks are divided into two groups, intrusive or extrusive, depending upon where the molten rock solidifies. Intrusive Igneous Rocks: Intrusive, or plutonic, igneous rock forms when magma is trapped deep inside the Earth.

What is Iugs classification of igneous rock?

The classification separates and individually classifies the pyroclastic, carbonatitic, melititic, lamprophyric and charnockitic rocks before entering the main QAPF classification for plutonic and volcanic rocks which is based on the modal mineral proportions of quartz (Q), alkali feldspar (A) and plagioclase (P) or of …

Which is the best classification of igneous rocks?

Figure 3.4.1 A simplified classification diagram for igneous rocks based on their mineral compositions. [Image Description]

What do you need to know about rock classification?

Rock Classification Answer Key Vocabulary: classify, extrusive igneous rock, foliation, fossil, igneous rock, intrusive igneous rock, metamorphic rock, mineral, sedimentary rock, strata, texture. Prior Knowledge Questions (Do these BEFORE using the Gizmo.) When you classify objects, you organize them into groups based on common characteristics.

How are pyroxene and feldspar used to describe igneous rocks?

A given rock is represented by a vertical line in the diagram. In the mafic field, the arrows represent a rock containing 48% pyroxene and 52% plagioclase feldspar. The name an igneous rock gets depends not only on composition, but on whether it is intrusive or extrusive.

How are ferromagnesian minerals found in igneous rocks?

That’s relatively easy in most igneous rocks because the ferromagnesian minerals are clearly darker than the others. At the same time, it’s quite difficult to estimate the proportions of minerals in a rock.