can you answer part A and B Activity 5.4 Minerals That Form Igneous Rock Name: C

Question

can you answer part A and B

Activity 5.4 Minerals That Form Igneous Rock Name: Course/Section: Date: Using information from the section Composition of Common Igneous Rocks" to identify the minerals in Fig. A54.1 Below each picture, write the name of the mineral. its chemical composition (chemical formula or c a description that would allow you to recognize it in the future. All samples are shown at approximately augite (pyroxene) their actual size. biotite mica hornblende (amphibole) potassium-rich alkali feldspar muscovite mica quartz plagioclase feldspar 2 4 8 Figure A5.4.1 felsic? How do you know? which specific minerals are mafic and which ones are f B REFLECT & DISCUSS 142

Explanation / Answer

A.

1. Olivine

2. Muscovite mica

3.Quartz

4. Hornblende(amphibole)

5.Augite(pyroxene)

6. Potassium rich alkali feldspar

7.Plagioclase feldspar

8.Biotite mica

B.

Mafic minerals are the minerals that are rich in iron and magnesium and thus darker in colour.

Here specimen, 4 5 and 8 are mafic.

Felsic minerals are the ones which are enriched in lighter elements and has lighter colour and lesser specific gravity.

Here specimen 1,2,3,6 and 7 are felsic

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