1. Three igneous rocks have the following characteristics: Feldspar 70%, quartz

Question

1. Three igneous rocks have the following characteristics: Feldspar 70%, quartz 15%, amphibole 5%, biotite 10% 0.1 m. all crystals less than b. Feldspar 45%, amphibole 20% , pyroxene 35%-all crystals between 0.5 and feldspar 40% (crystals greater than 10 mm), amphibole 30% and feldspar 30%) (crystals between 0.5 and 1 mm). c Use the diagram below to help you name the three rocks. (9 marks) C. b. a. MAFC ULTRAMAFIC FELSIC INTERMEDIATE 100 Biotite and/or Amphibole 90 Albite 70 u 60 s0 o 40 2 30 Pyroxene Quartz : Plagioclase feldspar 10- K-feldspar GraniteDiorte Peridotite Gabbro Basalt Komatiite Andesite Extrusive: Rhyolite

Explanation / Answer

a) granite

this rock is a granitic rock, a granular igneous rock

b)gabbro

coarse grained and dark colored rock

c)Andesite

dark fine gained volcanic rock

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