The Scheme for Igneous Rock Identification - PowerPoint PPT Presentation

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The Scheme for Igneous Rock Identification

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Lightest. Darkest. Density. Very Light. Light. Dense. Very Dense. Medium Density. Finding The Minerals ... work in the middle of the rock's box. This is the ... – PowerPoint PPT presentation

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Title: The Scheme for Igneous Rock Identification


1
The Scheme for Igneous Rock Identification
2
A Brief Tour
3
Crystal size
Grain size
Description
4
Igneous rocks have Intergrown Crystals
5
Intergrown
6
Intergrown
7
Intergrown
8
Not Intergrown
9
Where it was formed
Outside the volcano Extrusive
Inside the Earth Intrusive
10
Bubbles?
Yes Vesicular
11
Bubbles?
NoNon-vesicular
12
Color
Neither Light nor Dark
Very Light
NotVery Light
Very Dark
Not Very Dark
Light
Dark
Darkest
Lightest
13
Density
Very Light
Medium Density
Light
Dense
Very Dense
14
Finding The Minerals
Unless you have other information, work in the
middle of the rocks box.
Identify the rock.
15
This is the amount of Potassium Feldspar in the
rock.
16
This is the amount of Quartz in the rock.
17
This is the amount of Plagioclase Feldspar in the
rock.
18
Use tick marks on a scrap paper to measure the
percentage.
Potassium Feldspar 25
Quartz 40
19
Practice
Name a light-colored, fine-grained rock with no
bubbles.
20
Name a coarse-grained, dense rock.
21
Name a dark colored , dense rock that can be
intrusive or extrusive
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