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Section 5.2 Classifying Igneous Rocks
Main Idea
Texture
Use with page 109.
(continued)
Details
Explain how igneous rocks form mineral grains of different shapes
by completing the paragraphs below.
Mineral grains can have interlocking edges because
.
Well-shaped crystals can form during
.
When this happens,
.
Rocks with a porphyritic texture can form when
. This could happen
because
.
Igneous Rocks as
Resources
Use with page 111.
List two characteristics of igneous rocks that make them good
building materials.
1.
2.
Ore Deposits
Use with page 111.
Organize the steps in the formation of deposits in veins.
The fluid from which
magma crystallizes
The fluid fills
contains high levels
The fluid solidifies to form
of
containing
.
.
metals such as
,
,
,
, and
rare elements such as
and
.
S YNTHESIZE
Identify the characteristic of igneous rocks that you could use to
quickly determine whether a rock is extrusive or intrusive. Explain how this characteristic develops.
Igneous Rocks
51