3.1: Igneous Rock Iinquiry QA A ctivity 5.1: Igneous Rock Inquiry Name: Marus Co

Question

3.1: Igneous Rock Iinquiry QA A ctivity 5.1: Igneous Rock Inquiry Name: Marus Course/Section: Date: A. Analyze the igneous rocks in Fig. A5.1.1(and actual rock samples of them if available). They are depicted at approximately the same size as they are in nature. Beneath each picture, describe the rock's color, composition (what it is made of), and texture (the size, shape, and arrangement of its parts) as well as you can, using your current knowledge. Figure A5.1.1 : Some Igneous Rock Bodies Activity 5.2: Crystalline Textures of igneous Rock 926/2018, 12:00

Explanation / Answer

Sample 1:

Rock name: Diorite

Color: Intermediate/

Composition: Plagioclase, Pyroxene with minor amounts of quartz

Texture: Phaneritic

Sample 2:

Rock name : Obsidian

Colour: Mafic

Composition: Glass, No minerals can be identified in hand sample

Texture: Glassy

Sample no.3

Rock Name: Vesicular Andesite

Colour: Intermediate

Composition: Plagioclase, Pyroxene

Texture: Aphanitic

Structure: Vesicular

Sample no.4 :

Rock Name: Granite

Color: Felsic

Composition: Quartz, Potash Feldspar, Biotite, Sodium Plagioclase

Texture: Phaneritic

Sample 5 and 6 have not been shown properly hence I am unable to answer them.

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