Page 277 - Ultimate Visual Dictionary (DK)

IGNEOUS AND METAMORPHIC ROCKS

EXAMPLES OF EXTRUSIVE IGNEOUS ROCKS
Elongated vesicles Fine-grained Conchoidal
Porphyritic Fine- (gas cavities) groundmass fracture
texture grained (matrix)
crystals
Glassy
lustre

RHYOLITE BASALT PUMICE PORPHYRITIC OBSIDIAN
ANDESITE
Mesa (flat-topped
plateau)
Lake Caldera EXAMPLES OF INTRUSIVE
Extinct Lava Vent IGNEOUS ROCKS
geyser Sea flow Active
juvenile Dark
volcano groundmass (matrix)

Parasitic
volcano

Main
conduit
KIMBERLITE
Sagging
caused by Plagioclase feldspar
weight of
volcano

OLIVINE GABBRO
Amphibole
crystals

Magma
White
reservoir
feldspar
Eroded plug of
Batholith
extinct volcano FELDSPAR PEGMATITE
Laccolith
Fine Green High quartz Amphibole crystal
groundmass calc-silicate content
(matrix) mineral

Pyrites Chiastolite
crystal crystal
SLATE WITH CHIASTOLITE GREEN HALLEFLINTA SYENITE
PYRITES HORNFELS MARBLE

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