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Igneous rocks have “ Intergrown Mineral Crystals”

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Igneous rocks have “ Intergrown Mineral Crystals” - PowerPoint PPT Presentation


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Finding Mineral Composition in Igneous Rocks using Page 6 of the ESRT Run the slide show to go through the steps to finding the mineral composition of igneous rocks. When done, complete the matching page in your handout. Igneous rocks have “ Intergrown Mineral Crystals”. Intergrown.

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Presentation Transcript
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Finding Mineral Composition in Igneous Rocks using Page 6 of the ESRTRun the slide show to go through the steps to finding the mineral composition of igneous rocks. When done, complete the matching page in your handout.

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A rock like GRANITE can have a changing mineral composition

As you move left to right across the granite box, the amount of each mineral changes.

On the right side, the sample of granite would only have a tiny bit of potassium feldspar.

On the left side of the granite box, potassium feldspar makes up most of the rock.

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Picking a point and drawing a line down will help you to find the amount or percent of each mineral in that sample of rock.

You can then find the mineral percentages by sliding the paper down and measuring the % using the labeled y-axis.

The percentage of each mineral can be found by using a separate piece of paper and marking the width of each mineral.

40% quartz

20 % Plagioclase feldspar

20% potassium feldspar

once you get all the percentages you can add them up and the sum should be 100
Once you get all the percentages, you can add them up and the sum should be 100%

They add up to 100%

20%

40%

20%

10%

10%

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