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Chapter 5 Section 2

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Joy Maberry

on 17 October 2018

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Transcript of Chapter 5 Section 2

Chapter 5 Section 2
Classification of Igneous Rocks

Igneous Rock Classification
*Igneous rocks are first classified by formation. Intrusive are formed from
_______________ and extrusive are formed from _____________.

Mineral Composition of Igneous Rock
3. Igneous rocks with a composition somewhere ________________
between basaltic and granitic are referred to as intermediate.
- These ______________ are composed mainly of horneblende
and plagioclase feldspar. Ex: Diorite

4. Ultrabasic / Ultramafic
- This category of ____________ are composed of iron-rich
minerals such as olivine and pyroxene.
- These igneous rocks are always ____________ in color.

* Texture refers here to the size, _____________ and distribution of the
mineral _______________.
- The rate of ________________ and composition are factors determining the
texture of igneous rock. (Slow Cooling =____________- Fast = Small)
- Porphyritic rocks have _____________ well formed minerals surrounded
by fine grained. Ex: Porphyry (How?)
- Vesicular rocks look spongy due to gases not ____________ escaping.
Ex: Basalt, Pumice and Scoria
Igneous Rocks as Resources
* Igneous intrusions can _____________ contain valuable _________ deposits.

- These deposits frequently ______________ as veins. (121)

- Some veins ______________ extremely large-grained mineral deposits
called pegmatites. Ex: Li and Be (122)

Mineral Composition of Igneous Rock

1. Basaltic - __________ colored, low silica content, rich in _____________ and
magnesium. Ex: Gabbro and Basalt

2. Granitic - Lighter _____________, high silica content, contain potassium
and feldspar. Ex: Granite
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