'Classifying Igneous Rocks' Geography Worksheet printable pdf download

'Classifying Igneous Rocks' Geography Worksheet

Name:_____________________________________________________________ Date: ________________ Period: _____

Classifying Igneous Rocks

Problem

What are the characteristics of igneous rocks?

Materials

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Eight igneous rocks: granite, basalt, rhyolite, gabbro, pumice, pegmatite, scoria and obsidian.

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Magnifying glass

Procedure

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Color: Examine each rock sample. Determine its color (light, dark or mixed) and then list the

sample # and its color in the Data Table.

•

Texture: Examine each rock sample. Determine the texture of the mineral crystals. The crystals can

be large and visible, small and difﬁcult to see or not visible at all. List the texture in the Data Table.

•

List in the Data Table whether each rock is intrusive or extrusive.(Intrusive rocks have large crystals;

extrusive rocks have small or no crystals.)

Conclusions

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Use page 6 of your ESRTs to determine the identity of the rock samples.

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Once you have identiﬁed the rock samples, determine the minerals present in each sample.

Data Table

Density

Intrusive

Rock

Felsic or

Minerals

Rock

Color

(High or

Texture

Number

Maﬁc

Present

Name

Low)

Extrusive

'Classifying Igneous Rocks' Geography Worksheet