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Igneous Rocks Classification Quiz

Created by

@TimelyCentaur

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Questions and Answers

What characterizes metaluminous rocks in terms of aluminum content?

They have a positive aluminum index (A.I.) (correct)

They contain only sodic pyroxenes

They have a negative aluminum index (A.I.)

They are classified as SiO₂-saturated (correct)

Which minerals are characteristic of SiO₂-undersaturated metaluminous rocks?

Nepheline and ferric amphiboles

Nepheline and calcic pyroxenes (correct)

Quartz and sodic pyroxenes

Leucite and quartz

What does a negative aluminum index (A.I.) indicate about a rock?

It must be SiO₂-saturated

It belongs to the peralkaline category (correct)

It is metaluminous in classification

It contains only quartz

Which minerals would you expect to find in SiO₂-saturated peralkaline rocks?

<p>Quartz and sodic pyroxenes</p> Signup and view all the answers

How does the presence of trace elements relate to igneous rock classification?

<p>They assist in further characterizing specific rock types</p> Signup and view all the answers

Study Notes

Feldspathoid-Silica Saturation Index (FSSI)

The FSSI classifies igneous rocks based on the presence of certain minerals.
Metaluminous rocks have a positive aluminum (Al) content.
Peralkaline rocks have a negative aluminum (Al) content.
Silica-undersaturated rocks contain minerals like nepheline, calcic or sodic pyroxenes, and amphiboles.
Silica-saturated rocks contain minerals like quartz, ferric, magnessian, or calcic pyroxenes, and amphiboles.
Quartz-saturated rocks have an excess of quartz over leucite and nepheline.
Silica-undersaturated rocks have a negative amount of quartz over leucite and nepheline.

Trace Elements

Trace elements are used to characterize igneous rocks.

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Description

Test your knowledge on the Feldspathoid-Silica Saturation Index (FSSI) and how it classifies igneous rocks. This quiz covers the distinctions between metaluminous, peralkaline, and various types of silica-saturation in rocks, as well as the role of trace elements in characterization.